Roof structure

Abstract

A collapsible roof structure comprises: a support structure; a first roof member; and a second roof member. The first roof member is rotatably connected to the support structure proximate a first side of the support structure and the second roof member is rotatably connected to the support structure proximate a second side of the support structure. The first and second sides are opposed and separated in a first direction. There is at least some overlap between the first and second roof members in a second direction generally perpendicular to the first direction. The collapsible roof structure is configurable in at least two configurations. In a first configuration, a distal end of each of the first and second roof members is proximate to the support structure. In a second configuration, a distal end of the first roof member is in contact with a distal end of the second roof member and the distal ends of the first and second roof members are at substantially the same distance from the support structure.

Description

[0001] Roof structure

[0002] The present invention relates to new roof structures. In particular, it may relate to collapsible roof structures that can be configured in a first, collapsed configuration for transport to site and a second configuration for use as a roof. The present invention may relate to roof structures that are particularly suitable for use as part of a modular building system.

[0003] One traditional type of gable roof structure comprises two generally parallel eaves beams (or wall plates) supported by walls of a building, a ridge beam at the top of the roof structure and a plurality of rafters spanning between the ridge beam and each of the eaves beams. Typically, such roof structures are large and are constructed on site, which is labour intensive and can be rather slow.

[0004] A more modern type of roof structure uses trussed rafters, which are quicker and easier to construct a roof structure from than the above-mentioned traditional roof structure. However, a disadvantage of such a roof structure is that the available storage space is limited due to the structure of the trussed rafters.

[0005] It may be desirable to provide new, alternative roof structures that at least partially address one or more problems associated with prior art arrangements whether identified herein or otherwise.

[0006] According to a first aspect of the present disclosure there is provided a collapsible roof structure comprising: a support structure; a first roof member; and a second roof member; wherein the first roof member is rotatably connected to the support structure proximate a first side of the support structure and the second roof member is rotatably connected to the support structure proximate a second side of the support structure, the first and second sides being opposed and separated in a first direction, and wherein there is at least some overlap between the first and second roof members in a second direction generally perpendicular to the first direction, such that the collapsible roof structure is configurable in at least: a first configuration in which a distal end of each of the first and second roof members is proximate to the support structure; and a second configuration in which a distal end of the first roof member is in contact with a distal end of the second roof member and in which the distal ends of the first and second roof members are at substantially the same distance from the support structure.

[0007] The support structure may be referred to as a base. The support structure may be referred to as a support frame.

[0008] The first and second sides of the support structure may be generally mutually parallel. The support structure may be generally rectangular. A generally rectangular support structure is intended to mean any structure comprising at least two parallel members separated in the first direction and at least two parallel members separated in the second direction.

[0009] When the roof structure is disposed in the second configuration the support structure, the first roof member and the second roof member form a generally triangular roof structure.

[0010] The collapsible roof according to the first aspect is advantageous as now discussed. Typically, roof structures are large and are therefore traditionally constructed on site, which is labour intensive and can be rather slow. The collapsible roof can be formed off site and configured in the first configuration wherein it is effectively flat and can therefore be more easily stacked and transported to a construction site as a single unit. Once on site, the collapsible roof can be re-configured into the second configuration. Some collapsible trusses are known, however, typically these can only form one half of, or even less, of a gable roof type structure (and typically form a structure that is of the shape of a right-angled triangle). In contrast, the collapsible roof according to the first aspect can be used to form at least a section of a gable roof (that is of the shape of an isosceles triangle).

[0011] Furthermore, typically, existing collapsible trusses are formed using hinges that would not be suitable for use in the collapsible roof according to the first aspect. Typically, in known collapsible trusses, a top chord is rotatable relative to a bottom chord between a collapsed configuration and an extended configuration (an angle between the top chord and the bottom chord being larger in the extended configuration than in the collapsed configuration). Typically, such once in the extended configuration, the top chord cannot rotate further away from the bottom chord. That is, typically such collapsible trusses cannot be “over extended”.

[0012] With the collapsible roof according to the first aspect: (a) there is at least some overlap between the first and second roof members in the second direction; and (b) in the second configuration the distal ends of the first and second roof members are at substantially the same distance from the support structure. With such an arrangement, in order to move the collapsible roof from the first configuration to the second configuration, one of the first and second roof members (for example the first roof member) may need to be over extended or rotated further away from the support structure than its correct position for the second configuration while the other one is rotated to its correct position for the second configuration. Once the second roof member is in its correct position for the second configuration, the first roof member can be rotated back to its correct position for the second configuration.

[0013] It will be appreciated that a roof member being rotatably connected to a support structure means that the roof member can rotate relative to the support member. Such rotation is not limited to rotation about a single axis of rotation that is fixed relative to the support member. Rather, it includes more complex movement wherein the axis of rotation or pivot can move relative to the support structure.

[0014] According to a second aspect of the present disclosure there is provided a collapsible roof structure comprising: a support structure; a first roof member; and at least one hinge member; wherein the first roof member is rotatably connected to the support structure via the at least one hinge member proximate a first side of the support structure, such that an angle between the first roof member and the support structure can be varied; and wherein the at least one hinge member is connected to the first roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the first roof member relative to the support structure.

[0015] The collapsible roof according to the second aspect is advantageous, as now discussed. Typically, roof structures are large and are therefore traditionally constructed on site, which is labour intensive and can be rather slow. The collapsible roof can be formed off site and configured in a first configuration wherein it is effectively flat and can therefore be more easily transported to a construction site as a single unit. Once on site, the collapsible roof can be re-configured into a second configuration by rotating the first roof member relative to the support structure so as to increase an angle between the first roof member and the support structure.

[0016] Some collapsible trusses are known, however, typically these use hinges that are attached to the top and bottom chords using fixings that are generally parallel to an axis or pivot of rotation. The at least one hinge member is connected to the first roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the first roof member relative to the support structure. As a result, the at least one hinge member extends parallel to the axis or pivot of rotation. Advantageously, this allows a single hinge member to be attached to a plurality of rafters of a roof structure. For example, the hinge member may comprise sheet metal (for example a light gauge steel sheet). A first portion of the hinge member may extend along substantially the entire first side of the support structure (which may be defined by an eaves beam) and be attached to the support structure. A second portion of the hinge member may extend parallel to the first portion along substantially an entire extent of the roof member and be attached to the roof member (for example attached to the underside of a plurality of rafters).

[0017] In some embodiments of the collapsible roof structure according to the second aspect of the present disclosure, the collapsible roof structure may further comprise: a second roof member; and at least one second hinge member; wherein the second roof member is rotatably connected to the support structure via the at least one second hinge member proximate a second side of the support structure, such that an angle between the second roof member and the support structure can be varied; and wherein the at least one second hinge member is connected to the second roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the second roof member relative to the support structure.

[0018] In some embodiments of the collapsible roof structure according to the first aspect of the present disclosure, at least when disposed in one configuration, a distance between a plane of the support structure and a pivot of the first roof member is different to a distance between a plane of the support structure and a pivot of the second roof member. According to a third aspect of the present disclosure there is provided a collapsible roof structure comprising: a support structure; a first roof member; and a second roof member; wherein the first roof member is rotatably connected to the support structure proximate a first side of the support structure and the second roof member is rotatably connected to the support structure proximate a second side of the support structure, the first and second sides being opposed and separated in a first direction, such that the collapsible roof structure is configurable in at least: a first configuration in which a distal end of each of the first and second roof members is proximate to the support structure; and a second configuration in which a distal end of the first roof member is in contact with a distal end of the second roof member and in which the distal ends of the first and second roof members are at substantially the same distance from the support structure; and wherein, at least when disposed in the first configuration, a distance between a plane of the support structure and a pivot of the first roof member is different to a distance between a plane of the support structure and a pivot of the second roof member.

[0019] Optionally, the at least one configuration may be the first configuration.

[0020] The collapsible roof according to the third aspect is advantageous as now discussed. Typically, roof structures are large and are therefore traditionally constructed on site, which is labour intensive and can be rather slow. The collapsible roof can be formed off site and configured in the first configuration wherein it is effectively flat and can therefore be more easily transported to a construction site as a single unit. Once on site, the collapsible roof can be re-configured into the second configuration.

[0021] When the roof structure is disposed in the second configuration the support structure, the first roof member and the second roof member form a generally triangular roof structure. However, when the roof structure is disposed in the first configuration, the first and second members will partially overlap each other. If the pivots of the first and second roof members were both at the same distance from the plane of the support structure then it would not be possible for the first and second members (which have some non-zero height) to both be flat. Rather, one of the first and second members that is farther from the support structure would be disposed at a non-zero angle to the support structure. Furthermore, the larger the pitch of the roof the larger this angle will be. This limits the extent to which the roof structure can be collapsed and limits how a plurality of such roof structures can be stacked or otherwise loaded together for transport.

[0022] It will be appreciated that the support structure may be generally planar, by which is meant it may have two dimensions that are significantly larger than a third dimention. The two dimensions may define a plane (or a family of parallel planes) of the support structure. The third direction may be referred to as a height or a distance from a plane of the support structure.

[0023] In some embodiments of the collapsible roof structure according to the third aspect of the present disclosure, a height of the support structure proximate the first side of the support structure may be different to a height of the support structure proximate the second side of the support structure.

[0024] With such an arrangement, the pivots can remain fixed and be at different heights (i.e. different distances from the plane of the support structure). The difference in heights may be achieved by attaching an additional member to the first or second side of the support structure.

[0025] In some embodiments of the collapsible roof structure according to the third aspect of the present disclosure, at least one of the first roof member and second roof member may be rotatably connected to the support structure via at least one hinge member that allows for the first or second pivot respectively to be movable relative to the support structure.

[0026] With such an arrangement, the pivot of at least one of the first and second roof members may move, for example, from a first height (or distance from the plane of the support structure) when in the first configuration to a second height (or distance from the plane of the support structure) when in the second configuration. This may allow, for example, for (a) the distance between the plane of the support structure and the pivot of the first roof member to be different to the distance between the plane of the support structure and the pivot of the second roof member when disposed in the first configuration; and (b) the distance between the plane of the support structure and the pivots of the first and second roof members to be the same when disposed in the second configuration.

[0027] In some embodiments of the collapsible roof structure according to the first or third aspects of the present disclosure, the first roof member may be rotatably connected to the support structure via at least one first hinge member.

[0028] In some embodiments of the collapsible roof structure according to the first or third aspects of the present disclosure, the second roof member may be rotatably connected to the support structure via at least one second hinge member.

[0029] In some embodiments of the collapsible roof structure according to the first or third aspects of the present disclosure, the or each hinge member may be connected to the respective roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the respective roof member relative to the support structure.

[0030] The or each hinge member may comprise a sheet metal comprising a first portion that is fixed to the support structure and a second portion that is fixed to the roof member.

[0031] Rotation may be achieved by folding or bending the sheet metal.

[0032] The sheet metal may be perforated to aid bending or folding along the perforations (which may define the axis or pivot of rotation).

[0033] The first portion may be fixed to a beam member that forms part of the support structure.

[0034] The first portion may be fixed to two surfaces of the beam member that forms part of the support structure.

[0035] That is, the first portion wraps around the beam member (an eaves beam) and may, for example, be attached to: an upper surface of the beam member and an inside side surface of the beam member. Advantageously, this can spread the load of the roof structure more evenly over the length of the beam member. The second portion may be fixed to a surface of each of a plurality of rafters that form part of the roof member.

[0036] In particular, the second portion may be fixed to what is, in use, a bottom surface of each of the plurality of rafters that form part of the roof member. Advantageously, this can support the load of the roof member as a shear force.

[0037] Such a sheet metal may be foldable such that a pivot or axis of rotation may be defined. Although not flat, the sheet member may be generally parallel to the axis of rotation of the hinge member. That is, the sheet member may comprise a plurality of sections which are not mutually parallel but which are each generally parallel to the axis of rotation of the hinge member.

[0038] Additionally or alternatively, the hinge member may comprise one or more third portions that allow for the hinge member to be connected to the roof member using one or more fixings that are generally parallel to the axis or pivot of rotation of the roof member relative to the support structure.

[0039] The or each hinge member may comprise one or more third portions, each of which is generally perpendicular to the second portion.

[0040] In some embodiments, a third portion may be provided adjacent each of a plurality of rafters. Each of the third portions may comprise a section that is partially cut from the second portion and bent so as to be perpendicular thereto. Each third portion may be generally rectangular.

[0041] The support structure may comprise two generally parallel beam members separated in the first direction and one or more members spanning between, and supported by, the two parallel beam members.

[0042] The beam members may be referred to as eaves beams.

[0043] The two beam members may comprise insulating material. For example, each of the beam members may comprise a generally hollow box beam, which may be filled with an insulating material. The insulating material may be a foam or the like.

[0044] The support structure may comprise a generally rectangular thermal barrier across substantially the entire footprint of the support structure.

[0045] The one or more members spanning between, and supported by, the two parallel beam members may comprise one or more ceiling or floor joists. In some embodiments, the support structure may comprise a plurality of generally mutually parallel joists. Optionally, insulation may be provided between adjacent pairs of joists.

[0046] Alternatively, the one or more members spanning between, and supported by, the two parallel beam members may comprise a partition formed by a modular partition system comprising a plurality of panels and a plurality of connecting strips. For example, the modular partition system may be substantially as disclosed in WO2018178726, which is hereby incorporated by reference in its entirety. This modular partition system comprises a plurality of panels and a plurality of connecting strips. The connecting strips are for mutual connection of adjacent panels within the modular partition system.

[0047] The or each roof member may comprises a support member pivotally attached to a portion of the roof member such that: when the collapsible roof structure is disposed in the first configuration the support member can be generally parallel to the support structure; and when the collapsible roof structure is disposed in the second configuration the support member can be generally perpendicular to the support structure such that a distal end of the support member is in contact with the support member.

[0048] The support member may act as a queen post (or a plurality of queen posts). That is, the support member may transmit load from the roof member to the support member when the collapsible roof structure is disposed in the second configuration. The support member may be pivotally attached to a portion of the roof member disposed between: (a) a portion of the roof member that is rotatably connected to the support structure; and (b) a distal end of the roof member. For example, the support member may be pivotally attached to a portion of the roof member approximately midway between: (a) the portion of the roof member that is rotatably connected to the support structure; and (b) the distal end of the roof member.

[0049] The support structure may comprise a location feature for the support member of the or each roof member.

[0050] The location feature may comprise an angle bracket or the like. In use, the location feature may be attached to a distal end of the support member of the or each roof member once in the second configuration. This may be achieved using mechanical fixings (e.g. screws). Advantageously, this may allow for the load to be transferred from the support structure to the support member despite construction tolerances, which may mean that the support structure is not in contact with an upper surface of the support member.

[0051] The location feature for the support member of the or each roof member may be pivotally attached to a main portion of the support structure.

[0052] Advantageously, this may allow for the location feature to be folded flat when the collapsible roof structure is disposed in the first configuration.

[0053] The support member of at least one roof member may be adjustable in length.

[0054] For example, the support member of the one of the first roof member and the second roof member may comprise a portion proximate its distal end that can be configured in at least: a first configuration in which it is parallel to, and forms an extension of, a main portion of the support member; and a second configuration in which it is adjacent to the main portion. The first portion may be pivotally attached to the main portion.

[0055] The adjustable length of the support member may allow the one of the first roof member and the second roof member to be over-extended to allow for the other one to pass it.

[0056] Alternatively, in some embodiments, the support structure may comprise a temporary spacer member disposed adjacent a location feature for the support member of one of the first and second roof members. The temporary spacer member may allow one of the first and second roof members to be over-extended to allow for the other one of the first and second roof members to pass it.

[0057] The or each roof member may comprise a plurality of generally parallel rafters.

[0058] For such embodiments, the support member may be pivotally attached to each of the plurality of rafters. The support member may comprise a plurality of queen posts, each pivotally attached to a different one of the rafters. The support member may further comprise a board fixed to the plurality of queen posts.

[0059] The or each roof member may further comprise a ridge member extending generally perpendicular to the plurality of rafters at a first end thereof.

[0060] The or each roof member may further comprise a second member extending generally perpendicular to the plurality of rafters at a second end thereof.

[0061] The ridge member of the first roof member and / or the second roof member may comprise engagement features to allow for the distal ends of the first roof member and the second roof member to mutually engage.

[0062] For example, the two ridge members (which may be formed from timber) may each comprise one or more metal brackets to allow the two ridge members to snap together.

[0063] At least one roof member may comprise a membrane.

[0064] The membrane may cover a surface of the roof member that is distal from the support structure.

[0065] At least one of the first roof member and the second roof member may comprise a portion of a membrane that extends beyond a distal end of the roof member. The collapsible roof structure may further comprise a weight attached to the portion of the membrane that extends beyond a distal end of the roof member.

[0066] Each of the first and second roof members may comprise a tie member pivotally attached to a portion of that roof member such that: when the collapsible roof structure is disposed in the first configuration the tie members can be generally parallel to the roof member; and when the collapsible roof structure is disposed in the second configuration the tie members can be generally mutually parallel and such that a distal end of the two tie members are in contact with each other.

[0067] The tie members may alternatively be referred to as collar members. Advantageously, the tie members can help with the roof structure, especially when a span of the collapsible roof structure (for example in the first direction) is large.

[0068] According to a fourth aspect of the present disclosure there is provided a collapsible roof structure comprising: a support structure; at least one roof member; and at least one hinge member for the or each at least one roof member; wherein the or each roof member is rotatably connected to the support structure via the at least one corresponding hinge member proximate a side of the support structure, such that an angle between the or each roof member and the support structure can be varied; and wherein the at least one hinge member is such that: (a) the or each roof member can rotate relative to the support structure such that an axis of rotation or pivot of the or each roof member can move relative to the support structure; and / or (b) the of each roof member can rotate relative to the support structure about more than one pivot or axis of rotation.

[0069] The collapsible roof according to the fourth aspect is advantageous, as now discussed. Typically, roof structures are large and are therefore traditionally constructed on site, which is labour intensive and can be rather slow. The collapsible roof can be formed off site and configured in a first configuration wherein it is effectively flat and can therefore be more easily transported to a construction site as a single unit. Once on site, the collapsible roof can be re-configured into a second configuration by rotating the or each roof member relative to the support structure so as to increase an angle between the first roof member and the support structure.

[0070] Some collapsible trusses are known, however, typically these use simple hinges that only allow rotation about a single axis or pivot of rotation. In contrast, the at least one hinge member allows for a more complex relative movement of the or each roof member and the support structure. Advantageously, as discussed further below, this allows both: (a) for the or each roof member parallel to, in contact with, and supported by, a surface defined by the support structure when disposed in the second configuration; and (b) for the or each roof member to be disposable in an overextended position so as to allow another roof member to be extended into a second configuration.

[0071] It is particularly advantageous for the or each roof member parallel to, in contact with, and supported by, a surface defined by the support structure when disposed in the second configuration. This allows, for example, for the surface defined by the support structure to act as an effective “end-stop” for the or each roof member. In addition, this may allow for additional fixings to be easily provided to provide additional connection between the roof member and the support structure once the roof structure is disposed in the second configuration. Furthermore, this means that the hinge member(s) as supplied (for example without the such additional fixings) do not need to provide sufficient strength for in service requirements. Rather, the hinge member(s) only needs to support the weight of the roof member(s) during the reconfiguration process from the first configuration to the second configuration.

[0072] In some embodiments the roof structure may comprise two roof members arranged on opposite sides of the support structure. With such an arrangement, in order to move the collapsible roof from the first configuration to the second configuration, one of the first and second roof members (for example a first roof member) may need to be over extended or rotated further away from the support structure than its correct position for the second configuration while the other one is rotated to its correct position for the second configuration. Once the second roof member is in its correct position for the second configuration, the first roof member can be rotated back to its correct position for the second configuration.

[0073] However, if, as in some known arrangements, the roof member(s) are connected to the support structure using simple hinges that have a single pivot or axis of rotation it is not possible to both: (a) allow the support structure to provide such an end-stop function; and (b) allow the roof member(s) to be over-extended.

[0074] The or each at least one hinge member may be connected to a corresponding one of the at least one roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the corresponding roof member relative to the support structure.

[0075] The or each hinge member may comprise a first portion that is attached to the support structure and a second portion that is attached to the roof member.

[0076] The or each at least one hinge member may define a main axis of rotation of the roof member to which it is attached and the attachment of said hinge member to the support structure and / or the roof member may allow for a limited range of relative movement between the hinge member and the support structure and / or a limited range of relative movement between the hinge member and the roof member.

[0077] For example, in one embodiment, the first portion of the hinge member may be provided with a plurality of elongate slots and may be loosely attached to support structure via fixings (for example screws) that pass through the elongate slots and into the support structure. This connection allows for some limited movement of the hinge member relative to the support member. This tolerance may allow for the roof member to be disposed in an over-extended position. In particular, this tolerance may allow the roof member to rotate relative to the support structure about a second axis of rotation.

[0078] The limited range of relative movement between the hinge member and the support structure and / or the limited range of relative movement between the hinge member and the roof member may allow the roof member to rotate relative to the support structure about a second axis of rotation.

[0079] The or each at least one hinge member may define a main axis of rotation and a second axis of rotation of the roof member to which it is attached.

[0080] For example, the at least one hinge member may comprise sheet metal that may be bent, or bendable, about two different lines (to define the main axis of rotation and the second axis of rotation).

[0081] The or each at least one hinge member may comprise an arrangement for limiting a rotation of the hinge member about the second axis of rotation. The arrangement for limiting a rotation of the hinge member about the second axis of rotation may comprise one or more slots in the hinge member through which the hinge member is attached to the support structure or a corresponding roof member.

[0082] The or each hinge member may comprise sheet metal.

[0083] Rotation of the roof member relative to the beam member may be achieved by folding or bending the sheet metal.

[0084] The sheet metal may be perforated to aid bending or folding and to define an axis or pivot of rotation.

[0085] The first portion may be attached to a beam member that forms part of the support structure.

[0086] The first portion may be attached to two surfaces of the beam member that forms part of the support structure.

[0087] That is, the first portion may wrap around the beam member (an eaves beam) and may, for example, be attached to: an upper surface of the beam member and an inside side surface of the beam member. Advantageously, this can spread the load of the roof structure more evenly over the length of the beam member.

[0088] The second portion may be attached to a surface of each of a plurality of rafters that form part of the roof member.

[0089] In particular, the second portion may be fixed to what is, in use, a bottom surface of each of the plurality of rafters that form part of the roof member. Advantageously, this can support the load of the roof member as a shear force.

[0090] Such a sheet metal may be foldable such that a pivot or axis of rotation may be defined. Although not flat, the sheet member may be generally parallel to the axis of rotation of the hinge member. That is, the sheet member may comprise a plurality of sections which are not mutually parallel but which are each generally parallel to the axis of rotation of the hinge member. Additionally or alternatively, the hinge member may comprise one or more third portions that allow for the hinge member to be connected to the roof member using one or more fixings that are generally parallel to the axis or pivot of rotation of the roof member relative to the support structure.

[0091] The or each hinge member may comprise one or more third portions, each of which is generally perpendicular to the second portion.

[0092] In some embodiments, a third portion may be provided adjacent each of a plurality of rafters. Each of the third portions may comprise a section that is partially cut from the second portion and bent so as to be perpendicular thereto. Each third portion may be generally rectangular.

[0093] In some embodiments, the collapsible roof structure according to the fourth aspect of the present disclosure comprises: a first roof member; at least one first hinge member; a second roof member; and at least one second hinge member. The first roof member may be rotatably connected to the support structure via the at least one first hinge member proximate a first side of the support structure, such that an angle between the first roof member and the support structure can be varied. The second roof member may be rotatably connected to the support structure via the at least one second hinge member proximate a second side of the support structure, such that an angle between the second roof member and the support structure can be varied.

[0094] The first roof member may be rotatably connected to the support structure proximate a first side of the support structure and the second roof member may be rotatably connected to the support structure proximate a second side of the support structure, the first and second sides being opposed and separated in a first direction. The collapsible roof structure may be configurable in at least: a first configuration in which a distal end of each of the first and second roof members is proximate to the support structure; and a second configuration in which a distal end of the first roof member is in contact with a distal end of the second roof member and in which the distal ends of the first and second roof members are at substantially the same distance from the support structure. At least when disposed in the first configuration, a distance between a plane of the support structure and a pivot of the first roof member may be different to a distance between a plane of the support structure and a pivot of the second roof member.

[0095] A height of the support structure proximate the first side of the support structure may be different to a height of the support structure proximate the second side of the support structure.

[0096] There may be at least some overlap between the first and second roof members in a second direction generally perpendicular to the first direction.

[0097] When the roof structure is disposed in the second configuration, a portion of each of the first and second roof members may be parallel to and supported by a portion of the support structure.

[0098] For example, the support structure (for example a beam member thereof) may define a support surface orientated such that when one of the roof members is disposed in the second configuration the rafters are parallel to, and supported by (for example in indirect contact with), the support surface.

[0099] A main axis of rotation of corresponding hinge members may coincides with a first edge of the support surface.

[0100] When one of the roof members is disposed in the second configuration the support surface may prevent further rotation of that roof member about a main axis of rotation of its corresponding hinge members.

[0101] The support structure may comprise two generally parallel beam members separated in the first direction and one or more members spanning between, and supported by, the two parallel beam members.

[0102] The beam members may be referred to as eaves beams.

[0103] The two beam members may comprise insulating material. For example, each of the beam members may comprise a generally hollow box beam, which may be filled with an insulating material. The insulating material may be a foam or the like.

[0104] The support structure may comprise a generally rectangular thermal barrier across substantially the entire footprint of the support structure.

[0105] The one or more members spanning between, and supported by, the two parallel beam members may comprise one or more ceiling or floor joists. In some embodiments, the support structure may comprise a plurality of generally mutually parallel joists. Optionally, insulation may be provided between adjacent pairs of joists.

[0106] Alternatively, the one or more members spanning between, and supported by, the two parallel beam members may comprise a partition formed by a modular partition system comprising a plurality of panels and a plurality of connecting strips. For example, the modular partition system may be substantially as disclosed in WO2018178726, which is hereby incorporated by reference in its entirety. This modular partition system comprises a plurality of panels and a plurality of connecting strips. The connecting strips are for mutual connection of adjacent panels within the modular partition system.

[0107] The or each roof member may comprises a support member pivotally attached to a portion of the roof member such that: when the collapsible roof structure is disposed in the first configuration the support member can be generally parallel to the support structure; and when the collapsible roof structure is disposed in the second configuration the support member can be generally perpendicular to the support structure such that a distal end of the support member is in contact with the support member.

[0108] The support member may act as a queen post (or a plurality of queen posts). That is, the support member may transmit load from the roof member to the support member when the collapsible roof structure is disposed in the second configuration. The support member may be pivotally attached to a portion of the roof member disposed between: (a) a portion of the roof member that is rotatably connected to the support structure; and (b) a distal end of the roof member. For example, the support member may be pivotally attached to a portion of the roof member approximately midway between: (a) the portion of the roof member that is rotatably connected to the support structure; and (b) the distal end of the roof member.

[0109] The support structure may comprise a location feature for the support member of the or each roof member.

[0110] The location feature may comprise an angle bracket or the like. In use, the location feature may be attached to a distal end of the support member of the or each roof member once in the second configuration. This may be achieved using mechanical fixings (e.g. screws). Advantageously, this may allow for the load to be transferred from the support structure to the support member despite construction tolerances, which may mean that the support structure is not in contact with an upper surface of the support member.

[0111] The location feature for the support member of the or each roof member may be pivotally attached to a main portion of the support structure.

[0112] Advantageously, this may allow for the location feature to be folded flat when the collapsible roof structure is disposed in the first configuration.

[0113] The support member of at least one roof member may be adjustable in length.

[0114] For example, the support member of the one of the first roof member and the second roof member may comprise a portion proximate its distal end that can be configured in at least: a first configuration in which it is parallel to, and forms an extension of, a main portion of the support member; and a second configuration in which it is adjacent to the main portion. The first portion may be pivotally attached to the main portion.

[0115] The adjustable length of the support member may allow the one of the first roof member and the second roof member to be over-extended to allow for the other one to pass it.

[0116] Alternatively, in some embodiments, the support structure may comprise a temporary spacer member disposed adjacent a location feature for the support member of one of the first and second roof members. The temporary spacer member may allow one of the first and second roof members to be over-extended to allow for the other one of the first and second roof members to pass it.

[0117] The or each roof member may comprise a plurality of generally parallel rafters.

[0118] For such embodiments, the support member may be pivotally attached to each of the plurality of rafters. The support member may comprise a plurality of queen posts, each pivotally attached to a different one of the rafters. The support member may further comprise a board fixed to the plurality of queen posts.

[0119] The or each roof member may further comprise a ridge member extending generally perpendicular to the plurality of rafters at a first end thereof.

[0120] The or each roof member may further comprise a second member extending generally perpendicular to the plurality of rafters at a second end thereof.

[0121] The ridge member of the first roof member and / or the second roof member may comprise engagement features to allow for the distal ends of the first roof member and the second roof member to mutually engage.

[0122] For example, the two ridge members (which may be formed from timber) may each comprise one or more metal brackets to allow the two ridge members to snap together.

[0123] At least one roof member may comprise a membrane.

[0124] The membrane may cover a surface of the roof member that is distal from the support structure.

[0125] At least one of the first roof member and the second roof member may comprise a portion of a membrane that extends beyond a distal end of the roof member. The collapsible roof structure may further comprise a weight attached to the portion of the membrane that extends beyond a distal end of the roof member.

[0126] Each of the first and second roof members may comprise a tie member pivotally attached to a portion of that roof member such that: when the collapsible roof structure is disposed in the first configuration the tie members can be generally parallel to the roof member; and when the collapsible roof structure is disposed in the second configuration the tie members can be generally mutually parallel and such that a distal end of the two tie members are in contact with each other.

[0127] The tie members may alternatively be referred to as collar members. Advantageously, the tie members can help with the roof structure, especially when a span of the collapsible roof structure (for example in the first direction) is large.

[0128] According to a fifth aspect of the present disclosure there is provided a method of forming a roof structure, the method comprising: providing a collapsible roof structure according to any one of the first, third or fourth aspects of the present disclosure, the collapsible roof structure disposed in the first configuration; rotating the first roof member relative to the support structure to an intermediate position wherein the distal end of the first roof member is farther from the support structure than when disposed in the second configuration; rotating the second roof member relative to the support structure a position corresponding to the second configuration; and rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration.

[0129] According to a sixth aspect of the present disclosure there is provided a method of forming a roof structure, the method comprising: providing a collapsible roof structure of any one of the first, second, third or fouth aspects of the present disclosure, the collapsible roof structure disposed in a first configuration; rotating a first roof member relative to the support structure about a first pivot or axis of rotation to a second configuration; rotating the first roof member relative to the support structure about a second pivot or axis of rotation to an intermediate position wherein the distal end of the first roof member is farther from the support structure than when disposed in the second configuration; and rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration.

[0130] In some embodiments, the collapsible roof structure may comprise a first roof member; and a second roof member and the method according to the sixth aspect of the present disclosure may further comprise: while the first roof member is disposed in the intermediate position, rotating a second roof member relative to the support structure about another first pivot or axis of rotation to a position corresponding to the second configuration.

[0131] The method according to the fifth or sixth aspects of the present disclosure may further comprise rotating a support member of each roof member such that the support member is generally perpendicular to, and in contact with, the support structure.

[0132] The support member may act as a queen post (or a plurality of queen posts).

[0133] The method according to the fifth or sixth aspects of the present disclosure may further comprise mechanically fixing the support member of each roof member to the support structure.

[0134] The step of rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration may comprise reducing a length of the support member of the first roof member.

[0135] The step of rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration may comprise removing a temporary spacer member.

[0136] The method according to the fifth or sixth aspects of the present disclosure may further comprise fixing a second portion of the or each hinge member to the support structure.

[0137] Advantageously, this may better protect the roof structure against wind uplift.

[0138] The method according to the fifth or sixth aspects of the present disclosure may further comprise mutually engaging the distal ends of the first roof member and the second roof member.

[0139] For example, the two ridge members (which may be formed from timber) may each comprise one or more metal brackets to allow the two ridge members to snap together. The method according to the fifth or sixth aspects of the present disclosure may further comprise rotating a tie member of each roof member such that the two tie members are generally mutually parallel and such that a distal end of the two tie members are in contact with each other.

[0140] The method according to the fifth or sixth aspects of the present disclosure may further comprise mechanically fixing the two tie members together.

[0141] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings, in which:

[0142] Figures 1A to 1E schematically show an embodiment of a new collapsible roof structure according to the present disclosure, Figure 1A shows the collapsible roof structure in a first configuration, Figure 1E shows the collapsible roof structure in a second configuration and Figures 1 B to 1 D show the collapsible roof structure in intermediate configurations;

[0143] Figures 2A to 2E show an examples of a hinge structures that may form part of the new collapsible roof structure shown in Figures 1A to 1E; Figures 2A to 2E show a hinge member attached to both a rafter and a beam member; Figures 2A to 2C show the hinge member the rafter and the beam member with the roof structure disposed in the first configuration (cf. Figure 1A); Figure 2D shows the hinge member, the rafter and the beam member with the roof member (that the rafter forms part of) disposed in an over-extended position (cf. first roof member of Figure 1C); Figure 2E shows the hinge member, the rafter and the beam member with the roof structure disposed in the second configuration (cf. Figure 1 E);

[0144] Figure 2F shows a roof structure of the type shown in Figures 1A to 1E comprising a hinge member of the type shown in Figures 2A to 2E, wherein a first roof member is disposed in an over-extended position (i.e. in the positon shown in Figure 2D, cf. first roof member of Figure 1C);

[0145] Figures 3A to 3D show another embodiment of a roof structure of the type shown in Figures 1A to 1E wherein at least when disposed in the first configuration, a distance between a plane of the support structure and a pivot of the first roof member is different to a distance between a plane of the support structure and a pivot of the second roof member; Figure 3A shows the collapsible roof structure in a first configuration, Figure 3D shows the collapsible roof structure in a second configuration and Figures 3B and 3C show the collapsible roof structure in intermediate configurations;

[0146] Figures 4A and 4B show, respectively, enlarged portions of two beam members of a support structure of the roof structure shown in Figures 3A to 3D;

[0147] Figures 5A to 5C show a portion of a new roof structure of the type shown in Figures 1A to 4B showing some optional features of a support member and a support structure of the roof structure;

[0148] Figures 6A to 6D show a portion of a new roof structure of the type shown in Figures 1A to 5C showing some optional features engagement features to allow for the distal ends of the first roof member and the second roof member to mutually engage;

[0149] Figures 7A to 7B show a portion of a new roof structure of the type shown in Figures 1A to 6D showing optional membranes provided on the roof members;

[0150] Figures 8A to 8E show another embodiment of a roof structure of the type shown in Figures 1A to 1E wherein each of the first and second roof members comprises a tie member, the two tie members arranged such that they can be brought into contact with each other (see Figure 8E);

[0151] Figures 9A to 9B show another embodiment of a hinge member that may form part of one of the new roof structures according to the present disclosure, the hinge member attached to both a rafter and a beam member; Figure 9A shows the hinge member with the roof structure disposed in the first configuration (cf. Figure 1A); Figure 9B shows the hinge member in a configuration such that a roof member that hinge member is attached to can be disposed in an over-extended position (cf. first roof member of Figures 1C and 8B); Figure 9C shows the hinge member with the roof structure disposed in the second configuration (cf. Figures 1 E and 8E);

[0152] Figures 10A to 10F show the hinge member shown in Figures 9A to 9C in isolation; Figures 10A and 10B show the hinge member with the roof structure disposed in the first configuration (cf. Figure 1A); Figures 10C and 10D show the hinge member in a configuration such that a roof member that hinge member is attached to can be disposed in an over-extended position (cf. first roof member of Figures 1C and 8B); Figures 10E and 10F show the hinge member with the roof structure disposed in the second configuration (cf. Figures 1 E and 8E);

[0153] Figure 11 is a schematic illustration of a new method of forming a roof structure according to an embodiment of the present disclosure;

[0154] Figure 12A shows another embodiment of a hinge member that is generally of the form of the hinge member shown in Figures 9A to 10E, attached to both a rafter (of one of the roof members) and a beam member (of the support structure), and disposed in the first configuration;

[0155] Figure 12B shows another the embodiment of a hinge member shown in Figure 12A, attached to both a rafter (of one of the roof members) and a beam member (of the support structure), and disposed in the second configuration;

[0156] Figure 12C shows an enlarged portion of Figure 12A;

[0157] Figure 12D shows an enlarged portion of Figure 12B;

[0158] Figure 13A schematically an arrangement wherein a pivot is provided by notches in the rafters and shows a rafter (of one of the roof members) and a beam member (of the support structure) in the first configuration;

[0159] Figure 13B schematically shows the arrangement shown in Figure 13A disposed in the second configuration; and

[0160] Figure 13C schematically shows the arrangement shown in Figures 13A and 13B disposed in an over-extended position.

[0161] An embodiment of a new collapsible roof structure 100 according to the present disclosure is now described with reference to Figures 1A to 1 E. The collapsible roof structure 100 comprises: a support structure 110; a first roof member 120; and a second roof member 130.

[0162] The support structure 110 may be referred to as a base. Additionally or alternatively, the support structure 110 may be referred to as a support frame.

[0163] The support structure 110 comprises two generally parallel beam members 112, 114 separated in the first direction (the x-direction). A first beam member 112 is provided on a first side 110a of the support structure 110 and a second beam member 114 is provided on a second side 110b of the support structure 110, the first and second sides 110a, 110b being opposed and separated in the first direction. The beam members 112, 114 may be referred to as eaves beams. The two beam members 112, 114 may comprise insulating material. For example, each of the beam members 112, 114 may comprise a generally hollow box beam, which may be filled with an insulating material. The insulating material may be a foam or the like.

[0164] The support structure 110 comprises one or more members spanning between, and supported by, the two parallel beam members 112, 114. In particular, in this embodiment, the support structure 110 comprises four panels 116 and a plurality of connecting strips 118 of a modular partition system of the type disclosed in WO2018178726, which is hereby incorporated by reference in its entirety. The connecting strips 118 are for mutual connection of adjacent panels 116 within the modular partition system.

[0165] For such embodiments, the support structure 110 may be considered to comprise a generally rectangular thermal barrier across substantially the entire footprint of the support structure 110.

[0166] In alternative embodiments, the one or more members spanning between, and supported by, the two parallel beam members 112, 114 may comprise one or more ceiling or floor joists. In some embodiments, the support structure 110 may comprise a plurality of generally mutually parallel joists. Optionally, insulation may be provided between adjacent pairs of joists.

[0167] The first and second sides 110a, 110b of the support structure 110 are generally mutually parallel. The support structure 110 may be considered to be generally rectangular. A generally rectangular support structure is intended to mean any structure comprising at least two parallel members 112, 114 separated in the first direction (the x-direction) and at least two parallel members separated in the second direction (the y-direction).

[0168] Each of the first and second roof members 120, 130 comprises a plurality of generally parallel rafters 122, 132. In particular, in this embodiment, each of the first and second roof members 120, 130 comprises five generally parallel rafters 122, 132.

[0169] Each of the first and second roof members 120, 130 further comprises a ridge member 124, 134 extending generally perpendicular to the plurality of rafters 122, 132 at a distal end 122a, 132a thereof (i.e. at an end of the rafters 122, 132 distal the respective beam member 112, 114).

[0170] The first roof member 120 is rotatably connected to the support structure 110 proximate the first side 110a of the support structure 110. Similarly, the second roof member 130 is rotatably connected to the support structure 110 proximate the second side 110b of the support structure 110. Example embodiments of such rotatable connections between the first and second roof members 120, 130 and the support structure 110 are discussed further below with reference to Figures 2A to 4B. The first and second roof members 120, 130 generally mutually overlap in a second direction (the y-direction) that is generally perpendicular to the first direction (the x-direction).

[0171] It will be appreciated that a roof member 120, 130 being rotatably connected to a support structure 110 means that the roof member 120, 130 can rotate relative to the support structure 110. Such rotation is not limited to rotation about a single axis of rotation that is fixed relative to the support structure 110. Rather, it includes more complex movement wherein the axis of rotation or pivot can move relative to the support structure 110 and / or wherein the roof member 120, 130 can rotate relative to the support structure 110 about more than one pivot or axis of rotation.

[0172] The collapsible roof structure 100 is configurable in at least first and second configurations. In a first configuration (see Figure 1A), a distal end 120a, 130a of each of the first and second roof members 120, 130 is proximate to the support structure 110. In a second configuration (see Figure 1E), a distal end 120a of the first roof member 120 is in contact with a distal end 120a of the second roof member 130 and the distal ends 120a, 130a of the first and second roof members 120, 130 are at substantially the same distance from the support structure 110.

[0173] Each of the first and second roof members 120, 130 further comprises a support member 126, 136 pivotally attached to that roof member 120, 130. In particular, each such support member 126, 136 is pivotally attached to a portion of that roof member 120, 130 such that: when the collapsible roof structure 100 is disposed in the first configuration (see Figure 1A) the support member 126, 136 can be generally parallel to the support structure 110; and when the collapsible roof structure 100 is disposed in the second configuration (see Figure 1E) the support member 126, 136 can be generally perpendicular to the support structure 110 such that a distal end 126a, 136b of the support member 126, 136 is in contact with the support structure 110.

[0174] In use, the support members 126, 136 act as queen posts (or a plurality of queen posts). That is, the support members 126, 136 transmit load from its respective roof member 120, 130 to the support structure 110 when the collapsible roof structure 100 is disposed in the second configuration (see Figure 1 E). Each of the support members 126, 136 is pivotally attached to a portion of its respective roof member 120, 130 that is disposed between: (a) a portion of the roof member 120, 130 that is rotatably connected to the support structure 110; and (b) a distal end 120a, 130a of the roof member 120, 130. For example, each of the support members 126, 136 may be pivotally attached to a portion of its respective roof member 120, 130 that is approximately midway between: (a) the portion of the roof member 120, 130 that is rotatably connected to the support structure 110; and (b) the distal end 120a, 130a of the roof member 120, 130.

[0175] Each of the support members 126, 136 may be pivotally attached to each of the plurality of rafters 122, 132 of its respective roof member 120, 130. To achieve this, each support member 126, 136 comprises a plurality of queen posts 128, 138, each one pivotally attached to a different one of the rafters 122, 132. Each support member 126, 136 may further comprise one or more members (for example one or more cross members or a board) that is fixed to the plurality of queen posts 128, 138.

[0176] When the roof structure 100 is disposed in the second configuration (see Figure 1E), the support structure 110, the first roof member 120 and the second roof member 130 form a generally triangular roof structure.

[0177] The collapsible roof structure 100 shown in Figures 1A to 1 E is advantageous as now discussed. Typically, roof structures are large and are therefore traditionally constructed on site, which is labour intensive and can be rather slow. The collapsible roof structure 100 can be formed off site and configured in the first configuration (see Figure 1A) wherein it is effectively flat and can therefore be more easily stacked and transported to a construction site as a single unit. Once on site, the collapsible roof structure 100 can be re-configured into the second configuration (see Figure 1E). Some collapsible trusses are known, however, typically these can only form one half of, or even less, of a gable roof type structure (and typically form a structure that is of the shape of a right-angled triangle). In contrast, the collapsible roof structure 100 shown in Figures 1 A to 1 E can be used to form at least a section of a gable roof (that is, it can form a structure which is the shape of an isosceles triangle).

[0178] Furthermore, typically, existing collapsible trusses are formed using hinges that would not be suitable for use in the collapsible roof structure 100 shown in Figures 1A to 1 E. Typically, in known collapsible trusses, a top chord is rotatable relative to a bottom chord between a collapsed configuration and an extended configuration (an angle between the top chord and the bottom chord being larger in the extended configuration than in the collapsed configuration). Typically, such once in the extended configuration, the top chord cannot rotate further away from the bottom chord. That is, typically such collapsible trusses cannot be “over extended”.

[0179] With the collapsible roof structure 100 shown in Figures 1A to 1 E: (a) there is at least some overlap between the first and second roof members 120, 130 in the second direction (the y-direction); and (b) in the second configuration the distal ends of the first and second roof members 120, 130 are at substantially the same distance from the support structure 110. With such an arrangement, in order to move the collapsible roof structure 100 from the first configuration (see Figure 1A) to the second configuration (see Figure 1E), one of the first and second roof members 120, 130 (for example the first roof member 120) may need to be over extended or rotated further away from the support structure 110 than its correct position for the second configuration while the other one is rotated to its correct position for the second configuration. This is shown in Figure 1C, in which the first roof member 120 has been over extended or rotated further away from the support structure 110 than its correct position for the second configuration while the second roof member 130 is being rotated to its correct position for the second configuration. Once the second roof member 130 is in its correct position for the second configuration, the first roof member 120 can be rotated back to its correct position for the second configuration (see Figure 1E).

[0180] It will be appreciated that Figures 1A to 1E are schematic. In practice, the first roof member 120 may be rotatably connected to the support structure 110 via a first hinge member and the second roof member 130 may be rotatably connected to the support structure 110 via a second hinge member. Examples of such hinge structures are now described with reference to Figures 2A to 2F.

[0181] Figures 2A to 2E show a hinge member 150 attached to both a rafter 122, 132 (of one of the roof members 120, 130) and a beam member 112, 114 (of the support structure 110). Figures 2A to 2C show the hinge member 150, the rafter 122, 132 and the beam member 112, 114 with the roof structure 100 disposed in the first configuration (cf. Figure 1A). Figure 2D shows the hinge member 150, the rafter 122, 132 and the beam member 112, 114 with the roof member 120, 130 (that the rafter 122, 132 forms part of) disposed in an over-extended position (cf. first roof member of Figure 1C). Figure 2E shows the hinge member 150, the rafter 122, 132 and the beam member 112, 114 with the roof structure 100 disposed in the second configuration (cf. Figure 1 E).

[0182] Figure 2F shows the roof structure 100 wherein the hinge member 150 of the first roof member 120 is disposed in an over-extended position (i.e. in the positon shown in Figure 2D, cf. first roof member of Figure 1C).

[0183] The hinge member 150 comprises a sheet metal comprising a first portion 152 that is fixed to the support structure 110 and a second portion 154 that is fixed to the roof member 120, 130. As discussed further below, such a sheet metal may be foldable such that a pivot or axis of rotation 158 may be defined. Although not flat, the sheet member 150 may be generally parallel to the axis of rotation 158 of the hinge member 150. That is, the hinge member 150 may comprise a plurality of sections which are not mutually parallel but which are each generally parallel to an axis of rotation 158 of the hinge member 150.

[0184] The first portion 152 is folded around a corner of the beam member 112, 114. In particular, the first portion 152 comprises a portion 152a which is parallel to an upper surface of the beam member 112, 114 and a portion 152b which is parallel to an inner side surface of the beam member 112, 114 (i.e. a surface which faces the other beam member 112, 114).

[0185] The sheet metal hinge member 150 is perforated to aid bending or folding along the perforations. In particular, as best seen in Figure 2B, a line of perforations 156 is provided in the sheet metal between: (a) the portion 152a of the first portion 152 which is parallel to an upper surface of the beam member 112, 114; and (b) the second portion 154. The line of perforations is provided along a corner of the beam member 112, 114 and defines an axis of rotation 158 of the hinge member 150. The axis of rotation 158 of the hinge member 150 may be referred to as a main axis of rotation 158 of the hinge member 150.

[0186] Rotation of the roof member 120, 130 relative to the beam member 112, 114 may be achieved by folding or bending the sheet metal 150, as will be described further below. The roof structure 100 can be reconfigured from the first configuration (see Figures 2A to 2C) into the second configuration (see Figure 2E) by rotating the roof member 120, 130 (that the rafter 122, 132 forms part of) relative to the support structure 110 (that the beam member 112, 114 forms part of) about the axis of rotation 158. This causes the hinge member 150 to bend or fold along the line of perforations 156 such that the second portion 154 rotates relative to the first portion 152. Note that the beam member 112, 114 defines a support surface 112a, 114a orientated such that when the roof member 120, 130 is disposed in the second configuration the rafters 122, 132 are parallel to, and in contact with, the support surface 112a, 114a. The main axis of rotation 158 coincides with a first edge of the support surface 112a, 114a.

[0187] The first portion 152 is fixed to the beam member 112, 114, which forms part of the support structure 110.

[0188] In some embodiments, the first portion 152 of the hinge member 150 is fixed to two surfaces of the beam member 112, 114. That is, the first portion 152 may wrap around the beam member 112, 114 and may, for example, be attached to: an upper surface of the beam member 112, 114 and an inside side surface of the beam member 112, 114. For example, the portion 152a of the first portion 152 which is parallel to an upper surface of the beam member 112, 114 may be attached to the upper surface of the beam member 112, 114; and portion 152b which is parallel to the inner side surface of the beam member 112, 114 may be attached to the inner side surface of the beam member 112, 114. Advantageously, this can spread the load of the roof structure more evenly over the length of the beam member.

[0189] In this embodiment, as can be seen in Figures 2A to 2C, when supplied in the first configuration, only the portion 152b which is parallel to the inner side surface of the beam member 112, 114 is attached to the inner side surface of the beam member 112, 114.

[0190] In particular, the portion 152b of the hinge 150 which is parallel to the inner side surface of the beam member 112, 114 is provided with a plurality of elongate slots 160. When supplied in the first configuration, the portion 152b which is parallel to the inner side surface of the beam member 112, 114 is loosely attached to the inner side surface of the beam member 112, 114 via screws 162 that pass through the elongate slots and into the beam member 112, 114. This connection allows for some limited movement of the hinge member 150 relative to the beam member 112, 114, as now discussed.

[0191] As can be seen in Figure 2D, the loose connection via the screws 162 and elongate slots 160 allow for the hinge member 150 to temporarily move away from the upper surface of the beam member 112, 114. When the first roof member is moved into its overextended position, the portion 152a of the first portion 152 which is parallel to the upper surface of the beam member 112, 114 moves away from the upper surface of the beam member 112, 114 slightly. This tolerance allows for the roof member 120, 130 (that the rafter 122, 132 forms part of) to be disposed in an over-extended position (cf. first roof member of Figure 1C).

[0192] Note that, as explained above, when the roof member 120, 130 is disposed in the second configuration the rafters 122, 132 are parallel to, and in contact with, the support surface 112a, 114a, which may prevent further rotation about the main axis of rotation 158. As will be readily appreciated by the skilled person, one of the roof members 120, 130 of roof structure 100 can be reconfigured from the second configuration (see Figure 2E) into the overextended position (see Figure 2D) by rotating the roof member 120, 130 (that the rafter 122, 132 forms part of) relative to the support structure 110 (that the beam member 112, 114 forms part of) about a second axis of rotation 159. The second axis of rotation 159 coincides with a second edge of the support surface 112a, 114a (that is opposite the edge of the support surface 112a, 114a that coincides with the main axis of rotation).

[0193] This rotation of the roof member 120, 130 (that the rafter 122, 132 forms part of) relative to the support structure 110 (that the beam member 112, 114 forms part of) about the second axis of rotation 159 causes the hinge member 150 to temporarily move away from the upper surface of the beam member 112, 114 (in particular the portion 152a of the first portion 152 which is parallel to the upper surface of the beam member 112, 114 moves away from the upper surface of the beam member 112, 114 slightly).

[0194] Note that the hinge member 150 may be considered to allow the roof member 120, 130 to rotate relative to the support structure 110 such that the axis of rotation 158, 159 or pivot can move relative to the support structure 110. Alternatively, the hinge member 150 may be considered to allow the roof member 120, 130 to rotate relative to the support structure 110 about more than one pivot or axis of rotation 158, 159.

[0195] The loose connection via the screws 162 and elongate slots 160 may be considered to be an arrangement for limiting a rotation of the hinge member 150 about the second axis of rotation 159.

[0196] The second portion 154 of the hinge member 150 is fixed to a surface of each of a plurality of rafters 122, 132 that form part of the roof member 120, 130.

[0197] In some embodiments, the second portion 154 may be fixed to what is, in use, a bottom surface of each of the plurality of rafters 122, 132 that form part of the roof member 120, 130. Advantageously, this can support the load of the roof member as a shear force.

[0198] In this embodiment, the second portion 154 of the hinge member 150 comprises a plurality of third portions 166 that allow for the hinge member 150 to be connected to the roof member 120, 130 using one or more fixings that are generally parallel to the axis or pivot of rotation 158 of the hinge member 150 relative to the support structure 110.

[0199] Each of the third portions 164 is generally perpendicular to a main body of the second portion 154. A third portion 164 is provided adjacent each of a plurality of rafters 122, 132. Each of the third portions 164 comprises a section that is partially cut from the main body of the second portion 154 and bent so as to be perpendicular thereto. Each third portion 164 is generally rectangular. Each third portion 164 is provided with a plurality of through holes 166. Each third member 164 is attached to a rafter 122, 132 via screws 168 that pass through the through holes 166 and into the rafter 122, 124.

[0200] As can be seen in Figure 2E, once the roof structure 100 is in the second configuration, the hinge member 150 (of any roof members 120, 130 that were over-extended) move back towards the upper surface of the beam member 112, 114. In particular, the portion 152a of the first portion 152 which is parallel to the upper surface of the beam member 112, 114 is now in contact with the upper surface of the beam member 112, 114. The screws 162 that pass through the elongate slots 160 may be tightened. In addition, the main body of the second portion 154 of the hinge member is fixed to the beam member 112, 114 using additional screws 170. This is advantageous as it can provide additional support for the roof members 120, 130. In particular, this means that the hinge member 150 as supplied (for example without the additional screws 170) does not need to provide sufficient strength for in service requirements. Rather, the hinge member 150 only needs to support the weight of the rafters 122, 132 during the reconfiguration process from the first configuration to the second configuration.

[0201] Note that once the roof structure 100 is in the second configuration, the main body of the second portion 154 of the hinge member, and the rafters 122, 124 are generally parallel to a surface of the beam member 112, 114 (the support surface 112a, 114a discussed above).

[0202] Some embodiments of the present disclosure (including the embodiment shown in Figures 2A to 2E) relate to arrangements wherein the hinge members 150 are connected to the respective roof member 120, 130 and / or the support structure 110 using one or more fixings 162 that are generally perpendicular to an axis or pivot of rotation 158 of the respective hinge member 150 relative to the support structure 110. This can be advantageous, as now discussed.

[0203] Some collapsible trusses are known, however, typically these use hinges that are attached to the top and bottom chords of the truss using fixings that are generally parallel to an axis or pivot of rotation. In contrast, the hinge member 150 is connected to the roof members 120, 130 and / or the support structure 110 using one or more fixings 162 that are generally perpendicular to an axis or pivot of rotation 158 of the roof member 120, 130 relative to the support structure 110. As a result, the hinge member 150 can extends parallel to the axis or pivot of rotation 158. Advantageously, this allows a single hinge 150 member to be attached to a plurality of rafters 122, 132 of a roof structure 100. For example, the hinge member 150 may comprise sheet metal (for example a light gauge steel sheet). A first portion 152 of the hinge member may extend along substantially the entire first side of the support structure (which may be defined by an eaves beam 112, 114) and be attached to the support structure 110. A second portion 154 of the hinge member 150 may extend parallel to the first portion 152 along substantially an entire extent of the hinge member 150 and be attached to the roof member 120, 130 (for example attached to the underside of a plurality of rafters 122, 132).

[0204] In some embodiments of the present disclosure, at least when disposed in one configuration (for example the first configuration), a distance between a plane of the support structure 110 and a pivot 158 of the first roof member 120 is different to a distance between a plane of the support structure 110 and a pivot 158 of the second roof member 130.

[0205] This can be advantageous, as now discussed. When the roof structure 100 is disposed in the second configuration the support structure 110, the first roof member 120 and the second roof member 130 form a generally triangular roof structure. However, when the roof structure 100 is disposed in the first configuration, the first and second members 110, 120 will partially overlap each other. If the pivots of the first and second roof members were both at the same distance from the plane of the support structure 110 then it would not be possible for the first and second members 120, 130 (which have some non-zero height) to both be flat. Rather, one of the first and second roof members 120, 130 that is farther from the support structure 110 would be disposed at a non-zero angle to the support structure 110. Furthermore, the larger the pitch of the roof the larger this angle will be. This limits the extent to which the roof structure 100 can be collapsed and limits how a plurality of such roof structures can be stacked or otherwise loaded together for transport.

[0206] It will be appreciated that the support structure 110 may be generally planar, by which is meant it may have two dimensions (the x and y dimensions) that are significantly larger than a third dimension (the z dimension). The two dimensions may define a plane (or a family of parallel planes) of the support structure 110. The third direction (the z-direction) may be referred to as a height or a distance from a plane of the support structure 110.

[0207] Such an embodiment, wherein at least when disposed in the first configuration, a distance between a plane of the support structure 110 and a pivot 158 of the first roof member 120 is different to a distance between a plane of the support structure 110 and a pivot 158 of the second roof member 130 is now discussed with reference to Figures 3A to 4B. In this embodiment, a height 172 of the support structure 110 proximate the first side 110a of the support structure 110 is different to a height 174 of the support structure 110 proximate the second side 110b of the support structure 110.

[0208] With such an arrangement, the pivots 158 can remain fixed and be at different heights (i.e. different distances from the plane of the support structure 110). In this embodiment, the difference in heights is achieved by attaching an additional member 176 to the first side 110a of the support structure 110.

[0209] Alternatively, as is the case for the embodiment shown in Figures 2A to 2F, at least one of the first roof member 120 and second roof member 130 may be rotatably connected to the support structure 110 via a hinge member 150 that allows for the first or second pivot 158 respectively to be movable relative to the support structure 110. For example, as can be best seen by comparing Figures 2B and 2D, when a roof member 120, 130 is moved into its over-extended position, the portion 152a of the first portion 152 which is parallel to the upper surface of the beam member 112, 114 moves away from the upper surface of the beam member 112, 114 slightly. As a result, the pivot 158 of the hinge member 150 is movable relative to the support structure 110.

[0210] With such an arrangement, the pivot 158 of at least one of the first and second roof members 120, 130 may move, for example, from a first height (or distance from the plane of the support structure) when in the first configuration to a second height (or distance from the plane of the support structure) when in the second configuration. This may allow, for example, for (a) the distance between the plane of the support structure 110 and the pivot 158 of the first roof member 120 to be different to the distance between the plane of the support structure 110 and the pivot of the second roof member 130 when disposed in the first configuration; and (b) the distance between the plane of the support structure 110 and the pivots 158 of the first and second roof members 120, 130 to be the same when disposed in the second configuration.

[0211] In some embodiments, the support structure 110 may comprise a location feature for the support member 126, 136 of the or each roof member 120, 130. For example, as shown in Figure 3D, the location feature may comprise an angle bracket 178 or the like. In use, the location feature 178 may be attached to a distal end 126a, 136a of the support member 126, 136 of the or each roof member 120, 130 once in the second configuration. This may be achieved using mechanical fixings (e.g. screws). Advantageously, this may allow for the load to be transferred from the support structure 126, 136 to the support structure 110 despite construction tolerances, which may mean that the support structure is not in contact with an upper surface of the support member.

[0212] Another embodiment of a location feature 178 is shown schematically in the embodiment shown in Figures 5A to 5C.

[0213] In the embodiment shown in Figures 5A to 5C, the location feature 179 for the support member 126, 136 of the or each roof member 120, 130 is pivotally attached to a main portion of the support structure 110. Advantageously, this may allow for the location feature 178 to be folded flat when the collapsible roof structure 100 is disposed in the first configuration (see Figure 5A) but to be rotated so as to be adjacent to the distal end 126a, 136a of the support member 126, 136 of the or each roof member 120, 130 once in the second configuration.

[0214] In some embodiments of the collapsible roof structure, the support member 126, 136 of one of the first roof member 120 and the second roof member 130 may be adjustable in length, as now discussed with reference to Figures 5A to 5C.

[0215] In this embodiment, the support member 126, 136 of the one of the first roof member 120 and the second roof member 130 comprises a portion 180 proximate its distal end 126a, 136a that can be configured in at least: a first configuration (see Figure 5A) in which it is parallel to, and forms an extension of, a main portion 182 of the support member 126, 136; and a second configuration (see Figures 5B and 5C) in which it is adjacent to the main portion 182. The portion 180 proximate the distal end 126a, 136a is pivotally attached to the main portion 182.

[0216] The adjustable length of the support member 126, 136 may allow the one of the first roof member 120, 130 and the second roof member to be over-extended to allow for the other one to pass it. For example, the support member 126, 136 may be configured in the first configuration (see Figure 5A) in which the portion 180 proximate its distal end 126a, 136a is parallel to, and forms an extension of, a main portion 182 of the support member 126, 136 when the roof member is in the over-extended position. The support member 126, 136 may subsequently be re-configured in the second configuration (see Figures 5B and 5C) in which the portion 180 proximate its distal end 126a, 136a is is adjacent to the main portion 182 when the roof assembly 100 is configured in the second configuration.

[0217] Alternatively, in some embodiments, the support structure 110 may comprise a temporary spacer member (not shown) disposed adjacent a location feature 178 for the support member 126, 136 of one of the first and second roof members 120, 130. The temporary spacer member may allow one of the first and second roof members 120, 130 to be over-extended to allow for the other one of the first and second roof members to pass it.

[0218] In some embodiments, the or each roof member 120, 130 may comprise a plurality of generally parallel rafters 122, 132. For such embodiments, the support member 126, 136 may be pivotally attached to each of the plurality of rafters 122, 132. The support member may comprise a plurality of queen posts 184, each pivotally attached to a different one of the rafters 122, 132. The support member 126, 136 may further comprise one or more boards 186 fixed to the plurality of queen posts 184.

[0219] In some embodiments, the ridge member 124, 134 of the first roof member 120 and / or the second roof 130 member comprises engagement features 188, 190 to allow for the distal ends of the first roof member 120 and the second roof member 130 to mutually engage. For example, the two ridge members 124, 134 (which may be formed from timber) may each comprise one or more metal brackets 188, 190 to allow the two ridge 124, 134 members to snap together.

[0220] Such an embodiment is shown in Figure 2F and Figures 6A to 6D (which show enlarged portions of the embodiment shown in Figure 2F). As can be seen from Figures 6C and 6D, as the roof member (the first roof member 120 in this embodiment) that is in an over-extended position moves back for the roof assembly to be placed in the second configuration, the engagements features 188, 190 flex slightly and then snap into place together. Advantageously, these engagement features can avoid the need to work at height fixing the two roof members 120, 130 together.

[0221] In some embodiments, at least one roof member 120, 130 may comprises a membrane 192. The membrane 192 may cover a surface of the roof member 120, 130 that is distal from the support structure 110 (i.e. an outside surface of the roof member 120, 130). Such an embodiment is now described with reference to Figures 7A and 7B.

[0222] In this embodiment, a membrane 192 is provided over each of the first and second roof members 120, 130. It will be appreciated that the first roof member 120 and the second roof member 130 may each be completely covered by a membrane 192.

[0223] In this embodiment, the first roof member 120 comprises a portion 194 of membrane 192 that extends beyond a distal end 120a of the roof member 120. In addition, the collapsible roof structure 100 further comprises a weight 196 attached to the portion 194 of the membrane 192 that extends beyond a distal end 120a of the roof member 120. In this embodiment, the weight 196 comprises a timber batten. Advantageously, as can be seen in Figure 7A, the weight 196 may ensure that the portion 194 of the membrane 192 that extends beyond a distal end 120a of the roof member 120 hangs taught and substantially vertical (under gravity) when the first roof member is disposed in its over-extended position. As can be seen from Figure 7B, once the second roof member 130 is in its second-configuration position, as the first roof member 120 moves back to its second-configuration position, the weight 196 and the portion 194 of the membrane 192 that extends beyond a distal end 120a of the roof member 120 may slide down the second roof member 130. With such an arrangement, the roof assembly 100 can be made substantially weather-proof by simply fixing the weight 196 to the rafters 132 of the second roof member 130 once the roof assembly 100 is disposed in the second configuration.

[0224] In some of embodiments, each of the first and second roof members 120, 130 comprises a tie member 198, 200 pivotally attached to a portion of that roof member 120, 130, as now discussed with reference to Figures 8A to 8E.

[0225] In particular, tie members 198, 200 are pivotally attached to a portion of the respective roof member 120, 130 such that: when the collapsible roof structure 100 is disposed in the first configuration the tie members 198, 200 can be generally parallel to the respective roof member 120, 130; and when the collapsible roof structure 100 is disposed in the second configuration the tie members 198, 200 can be generally mutually parallel and such that a distal end 198a, 200a of the two tie members 198, 200 are in contact with each other (see Figure 8E).

[0226] The tie members 198, 200 may alternatively be referred to as collar members. Advantageously, the tie members 198, 200 can help with the roof structure, especially when a span of the collapsible roof structure (for example in the first direction) is large.

[0227] Note that, the embodiment shown in Figures 8A to 8E also uses a different type of hinge member 202, as now discussed with reference to Figures 9A to 10E. In this embodiment, a hinge member 202 is provided for each individual rafter 122, 132.

[0228] Figures 9A to 9B show the new hinge member 202 attached to both a rafter 122, 132 (of one of the roof members 120, 130) and a beam member 112, 114 (of the support structure 110). Figures 10A to 10F show the new hinge member 202 in isolation.

[0229] Figures 9A, 10A and 10B show the hinge member 202 with the roof structure 100 disposed in the first configuration (cf. Figure 1A). Figures 9B, 10C and 10D show the hinge member 202 in a configuration such that a roof member 120, 130 that hinge member 202 is attached to can be disposed in an over-extended position (cf. first roof member of Figures 1C and 8B). Figures 9C, 10E and 10F show the hinge member 202 with the roof structure 100 disposed in the second configuration (cf. Figures 1E and 8E).

[0230] The hinge member 202 comprises a sheet metal comprising a first portion 204 that is fixed to the support structure 110 and a second portion 206 that is fixed to the roof member 120, 130. As discussed further below, such a sheet metal may be foldable such that a pivot or axis of rotation 210 may be defined. Although not flat, the sheet member 202 may be generally parallel to the axis of rotation 210 of the hinge member 202. That is, the sheet member 202 may comprise a plurality of sections which are not mutually parallel but which are each generally parallel to the axis of rotation 210 of the hinge member 202. The first portion 204 is folded around a corner of the beam member 112, 114. In particular, the first portion 204 comprises a portion 204a which is parallel to an upper surface of the beam member 112, 114 and a portion 204b which is parallel to an inner side surface of the beam member 112, 114 (i.e. a surface which faces the other beam member 112, 114).

[0231] As with the hinge member 150 shown in Figures 2A to 2E, the hinge member 202 shown in Figures 9 and 10 is perforated to aid bending or folding along the perforations. In particular, a line of perforations is provided in the sheet metal between: (a) the portion 204a of the first portion 204 which is parallel to an upper surface of the beam member 112, 114; and (b) the second portion 206. The line of perforations is provided along a corner of the beam member 112, 114 and defines an axis of rotation 210 of the hinge member 202. The axis of rotation 210 of the hinge member 202 may be referred to as a main axis of rotation 210 of the hinge member 202.

[0232] Rotation of the roof member 120, 130 relative to the beam member 112, 114 may be achieved by folding or bending the sheet metal 202, as will be described further below.

[0233] The roof structure 100 can be reconfigured from the first configuration (see Figure 9A) into the second configuration (see Figure 9C) by rotating the roof member 120, 130 (that the rafter 122, 132 forms part of) relative to the support structure 110 (that the beam member 112, 114 forms part of) about the axis of rotation 210. This causes the hinge member 202 to bend or fold. Note that the beam member 112, 114 defines a support surface 112a, 114a orientated such that when the roof member 120, 130 is disposed in the second configuration the rafters 122, 132 are parallel to, and in contact with, the support surface 112a, 114a. The main axis of rotation 210 coincides with a first edge of the support surface 112a, 114a.

[0234] The first portion 204 is fixed to the beam member 112, 114, which forms part of the support structure 110.

[0235] In some embodiments, the first portion 204 of the hinge member 202 is fixed to two surfaces of the beam member 112, 114. That is, the first portion 204 may wrap around the beam member 112, 114 and may, for example, be attached to: an upper surface of the beam member 112, 114 and an inside side surface of the beam member 112, 114. For example, the portion 204a of the first portion 204 which is parallel to an upper surface of the beam member 112, 114 may be attached to the upper surface of the beam member 112, 114; and portion 204b which is parallel to the inner side surface of the beam member 112, 114 may be attached to the inner side surface of the beam member 112, 114. Advantageously, this can spread the load of the roof structure more evenly over the length of the beam member 112, 114.

[0236] The first portion 204 is provided with a plurality of through holes 208. The first portion 204 may be attached to the beam member 112, 114 via screws that pass through the through holes 208 and into the beam member 112, 114.

[0237] In this embodiment, the second portion 206 of the hinge member 202 comprises two portions 206a, 206b which are folded back on each other. A first portion 206a of the second portion 206 extends away from the first portion 204 (which it is connected to at the axis of rotation 210). The second portion 206 is folded such that a second portion 206b of the second portion 206 extends generally parallel to the first portion 206a and back towards the axis of rotation 210.

[0238] In some embodiments, the first portion 206a of the second portion 206 may be fixed to the beam member 112, 114. In particular, the first portion 206a of the second portion 206 is provided with a plurality of through holes 212. The first portion 206a of the second portion 206 may be attached to the beam member 112, 114 via screws that pass through the through holes 212 and into the beam member 112, 114.

[0239] In some embodiments, the second portion 206b of the second portion 206 may be fixed to what is, in use, a bottom surface of one of the plurality of rafters 122, 132 that form part of the roof member 120, 130. Advantageously, this can support the load of the roof member as a shear force.

[0240] In this embodiment, the second portion 206b of the second portion 206 of the hinge member 202 comprises two third portions 214 that allow for the hinge member 202 to be connected to the roof member 120, 130 using one or more fixings that are generally parallel to the axis or pivot of rotation 210 of the hinge member 202 relative to the support structure 110. Each of the third portions 214 is generally perpendicular to a main body of the second portion 206b of the second portion 206. A third portion 214 is provided adjacent each side of the rafter 122, 132. Each of the third portions 214 comprises a section that is partially cut from the main body of the second portion 206b of the second portion 206 and bent so as to be perpendicular thereto. Each third portion 214 is generally rectangular. Each third portion 210 is provided with a plurality of through holes 216. Each third member 210 may be attached to a rafter 122, 132 via screws that pass through the through holes 216 and into the rafter 122, 124.

[0241] In this embodiment, the second portion 206 of the hinge member 202 comprises two portions 206a, 206b which are folded back on each other (at a fold line 218). These two portions 206a, 206b are mutually parallel when the roof structure 100 is in the first (see Figure 9A) and second (see Figure 9C) configurations. However, the second portion 206b can rotate relative to the first portion 206a (which may be attached to the beam member 112, 114). It is this rotation that allows for a roof member 120, 130 to which the hinge member 202 is attached to rotate into an over-extended position (see Figure 9B).

[0242] Note that, as explained above, when the roof member 120, 130 is disposed in the second configuration the rafters 122, 132 are parallel to, and in contact with, the support surface 112a, 114a, which may prevent further rotation about the main axis of rotation 210. As will be readily appreciated by the skilled person, one of the roof members 120, 130 of roof structure 100 can be reconfigured from the second configuration (see Figure 9C) into the overextended position (see Figure 9B) by rotating the roof member 120, 130 (that the rafter 122, 132 forms part of) relative to the support structure 110 (that the beam member 112, 114 forms part of) about fold line 218 (which may be considered to be a second axis of rotation 218). The second axis of rotation 218 coincides with a second edge of the support surface 112a, 114a (that is opposite the edge of the support surface 112a, 114a that coincides with the main axis of rotation).

[0243] This rotation of the roof member 120, 130 (that the rafter 122, 132 forms part of) relative to the support structure 110 (that the beam member 112, 114 forms part of) about the second axis of rotation 218 causes the second portion 206b to rotate relative to the first portion 206a (which may be attached to the beam member 112, 114). Note that the hinge member 202 may be considered to allow the roof member 120, 130 to rotate relative to the support structure 110 such that the axis of rotation 210, 218 or pivot can move relative to the support structure 110. Alternatively, the hinge member 202 may be considered to allow the roof member 120, 130 to rotate relative to the support structure 110 about more than one pivot or axis of rotation 210, 218.

[0244] Once the roof structure 100 is in the second configuration, the two portions 206a, 206b of the hinge member 202 (of any roof members 120, 130 that were over-extended) move back towards each other so as to be mutually parallel. A plurality of through apertures 220 are provided in both of the two portions 206a, 206b of the second portion 206. These through apertures 220 pass through both of the two portions 206a, 206b. Once the roof structure 100 is in the second configuration, the second portion 206 of the hinge member 202 is fixed to the beam member 112, 114 using screws that pass through the through apertures 220 and into the beam member 112, 114.

[0245] Some embodiments of the present disclosure relate to a new method 300 of forming a roof structure 100, as now discussed with reference to Figure 11.

[0246] The new method 300 comprises a step 310 of providing a collapsible roof structure 100 of the type described above with reference to Figures 1A to 8E, the collapsible roof structure 100 being disposed in the first configuration.

[0247] The new method 300 further comprises a step 320 of rotating the first roof member 120 relative to the support structure 110 to an intermediate position wherein the distal end 120a of the first roof member 120 is farther from the support structure 110 than when disposed in the second configuration.

[0248] The new method 300 further comprises a step 330 of rotating the second roof member 130 relative to the support structure 110 a position corresponding to the second configuration.

[0249] The new method 300 further comprises a step 340 of rotating the first roof member 120 relative to the support structure 110 from the intermediate position back to a position corresponding to the second configuration. Optionally, the method 300 may further comprise a step 350 of rotating a support member 126, 136 of each roof member 120, 130 such that the support member 126, 136 is generally perpendicular to, and in contact with, the support structure 110. The support member 126, 136 may act as a queen post (or a plurality of queen posts). Optionally, the method 300 may further comprise mechanically fixing the support member 126, 136 of each roof member to the support structure 110.

[0250] Optionally, the step 340 of rotating the first roof member 120 relative to the support structure 110 from the intermediate position back to a position corresponding to the second configuration may comprise reducing a length of the support member 126 of the first roof member 120.

[0251] Optionally, the step 340 of rotating the first roof member 120 relative to the support structure 110 from the intermediate position back to a position corresponding to the second configuration may comprise removing a temporary spacer member.

[0252] Optionally, the method 300 may further comprise fixing a second portion 154 of the or each hinge member 150 to the support structure 110. Advantageously, this may better protect the roof structure 100 against wind uplift.

[0253] Optionally, the method 300 may further comprise mutually engaging the distal ends of the first roof member 120 and the second roof member 130. For example, the two ridge members 124, 134 (which may be formed from timber) may each comprise one or more metal brackets 188, 190 to allow the two ridge members 124, 134 to snap together.

[0254] Optionally, the method 300 may further comprise a step 360 of rotating a tie member 198, 200 of each roof member 120, 130 such that the two tie members 198, 200 are generally mutually parallel and such that a distal end 198a, 200a of the two tie members 198, 200 are in contact with each other. Optionally, the method 300 may further comprise mechanically fixing the two tie members 198, 200 together.

[0255] Figures 12A to 12D show another embodiment of a hinge member 402 that is generally of the form of the hinge member 202 shown in Figures 9A to 10E and as discussed above. Again, in this embodiment, a hinge member 402 is provided for each individual rafter 122, 132.

[0256] Figures 12A and 12B show the new hinge member 402 attached to both a rafter 122, 132 (of one of the roof members 120, 130) and a beam member 112, 114 (of the support structure 110) in the first and second configurations respectively. Figures 12C and 12D each show an enlarged portion of Figures 12A and 12B respectively, showing more detail of the new hinge member 402.

[0257] As mentioned above, the new hinge member 402 is very similar in construction and operation to the hinge member 202 shown in Figures 9A to 10E. In the following, only the differences will be discussed in detail. In general, any feature of the new hinge member 402 shown in Figures 12A to 12D that is generally equivalent to a feature of the hinge member 202 shown in Figures 9A to 10E shares common reference numerals therewith.

[0258] A first difference is that the two third portions 214 that allow for the hinge member 402 to be connected to the roof member 120, 130 using one or more fixings that are generally parallel to the axis or pivot of rotation 210 of the hinge member 402 relative to the support structure 110 are a different shape. Furthermore, in the embodiment of a hinge member 202 shown in Figures 9A to 10E, the third portions each comprise a central portion of the main body of the second portion 206b that has been bent so as to be perpendicular to the main body of the second portion 206b (such that there is a portion of the main body of the second portion 206b on either side of each third portion 214). In contrast, in the embodiment of a hinge member 402 shown in Figures 12A to 12D, each of the third portions comprises a portion of the main body of the second portion 206b that is distal the second axis of rotation 218.

[0259] A second difference is that the embodiment of a hinge member 402 shown in Figures 12A to 12D further comprises (at least one) fourth portion 404.

[0260] The fourth portion 404 comprises: a first part 404a and a second part 404b. The first part 404a of the fourth portion 404 is rigidly connected to, or forms part of, the first portion 204 of the hinge member 402. The second part 404b is coupled to a third portion 214 such that the second part 404b can move relative to the third portion 214 in a constrained manner. The first part 404a and the second part 404b are generally mutually perpendicular.

[0261] In this example embodiment the fourth portion 404 comprises a separate piece of sheet metal that is generally of the form of an angle bracket. The first part 404a is provided with apertures 406 for attaching it to the first portion 204 of the hinge member 402 using screws (not shown). However, in alternative embodiments, the fourth portion 404 may be integrally formed with the rest of the hinge member 402 and the second part 404b may comprise a portion that has been cut from the first portion 204 and bent so as to be perpendicular thereto (in a similar way to how the third portions 214 are formed).

[0262] In order for the second part 404b to be coupled to a third portion 214 such that the second part 404b can move relative to the third portion 214 in a constrained manner, a curved slot 408 is formed in the second part 404b and a screw 410 attaches the second part 404b to the third portion 214 through the curved slot 408. The screw 410 is constrained by the curved slot 408, which, in turn, constrains the relative movement of the third portion 214 and the fourth portion 404.

[0263] The curved slot 408 and screw 410 are arranged to ensure that, in use, the hinge member 402 follows a nominal or desired path. For example, as is the case in this embodiment, the curved slit 408 may comprise a first portion and a second portion. The first portion may constrain the movement of the hinge member 402 such that when one of the roof members 110, 120 is being moved from the first configuration to the second configuration no or negligible rotation of the second portion 206b of the second portion 206 is permitted relative to the first portion 206a of the second portion 206. The second portion may constrain the movement of the hinge member 402 such that when one of the roof members 110, 120 is being moved from the second configuration to the over-extended position a non-zero but limited amount of negligible rotation of the second portion 206b of the second portion 206 is permitted relative to the first portion 206a of the second portion 206.

[0264] Advantageously, the curved slot 408 and screw 410 result in improved stability of the hinge member 402. The curved slot 408 and screw 410 may be considered to be an arrangement for limiting a rotation of the hinge member 402 about the second axis of rotation 218.

[0265] In some embodiments of the present disclosure the or each beam member 112, 114 (of the support structure 110) and the corresponding rafters 122, 132 (of one of the roof members 120, 130) may define complementary engagement features which mutually cooperate so as to define a second pivot or second axis of rotation of a hinge member of the roof structure(s) 100. This is now explained briefly with reference to Figures 13A to 13B.

[0266] Figures 13A to 13C schematically show a rafter 122, 132 (of one of the roof members 120, 130) and a beam member 112, 114 (of the support structure 110) in the first configuration, the second configuration and an over-extended position respectively. The hinge member is not shown in these schematic Figures, however, this type of arrangement is intended to be used with a hinge member generally of the type 150 shown in Figures 2A to 2F, in which a portion 506 of the hinge member can move in a limited or constrained manner relative to the support structure 110 (for example in a manner allowed by the loose connection via the screws 162 and elongate slots 160 described above with reference to Figures 2A to 2E).

[0267] In this schematic example, the rafters 122, 132 (of one of the roof members 120, 130) each define a notch 502 for receipt of a portion, member or protrusion 504 defined by a beam member 112, 114 (of the support structure 110) when the roof structure 100 is disposed in the second configuration.

[0268] In this arrangement, the beam member 112, 114 has been reduced in size and there are two distinct pivot points. A first pivot point is provided by the portion 506 of the hinge member that can move in a limited or constrained manner relative to the support structure 110. A second pivot point is provided by the notch 502 in the rafters 122, 132.

[0269] In any of the embodiments described above, the rafters 122, 132 may comprise timber rafters of the type used in traditional roof structures. Alternatively, the rafters 122, 132 may comprise aluminium members. In addition, one or more of the roof members 120, 130 may further comprise panels attached to the rafters 122, 132. With such embodiments, a finished roof covering can be pre-fitted to the roof members 120, 130. Additionally, with such embodiments, since the panels run from the ridge of the roof to the eaves, if a roof is formed from two adjacent roof structures 100 according to the present disclosure (for example adjacent to each other in the y-direction (see Figures 1A to 1E), the two adjacent roof structures 100 can easily be made weather tight providing a joining panel in situ between the two adjacent roof structures 100 which also runs from the ridge of the roof to the eaves.

[0270] In any of the embodiments described above, the support structure 110 may be designed with lifting points to enable the roof structure to be lifted using lifting apparatus. Specifically, the lifting points may be provided on the beam members 112, 114. In some embodiments, the lifting points may be designed and / or positioned so that the roof structure can be lifted suing them in either of the first and / or second configurations. With such embodiments, the transition from the first configuration to the second configuration may occur while the roof structure 100 is being lifted. This may be advantageous is there is no suitable ground around the building that is being constructed to rest the roof structure 100 on.

[0271] In any of the embodiments described above, the beam members 112, 114 may be designed such that they maintain a thermal envelope across substantially the entire support structure 110.

[0272] The various embodiments of roof structure 100 (and associated methods of installation) described above have a number of advantages, as now discussed.

[0273] A first benefit of the new roof structure 100 is an improvement in the health and safety of installing a roof structure. Working on traditional roof trusses at height is a dangerous activity. In addition, lifting roof trusses into position with telescopic handler (telehandler) is not always seen as the best option and therefore often traditional roof trusses are lifted using cranes, which is costly.

[0274] A second benefit of the new roof structure 100 is an improvement in site preparation. With the new roof structure 100 described above there is no longer any need for a crash deck below the roof, which can result in a significant cost saving. In addition, the new roof structure 100 may be installed with less scaffolding, for example at the gable ends.

[0275] A third benefit of the new roof structure 100 is that the roof structure can be watertight as installed (see, in particular Figures 7A-7B and the accompanying description). In contrast, once a traditional truss roof has been installer, a roofer must cover the roof structure with a membrane and roof battens before it is watertight. However, this can often cause scheduling issues (for example if the roofer is not available as soon as the roof structure has been completed) and possible delays.

[0276] A fourth benefit of the new roof structure 100 is an improvement in continuity of a thermal envelope between the walls and ceiling of the building that the roof structure 100 is installed on.

[0277] A fifth benefit of the new roof structure 100 is a creation of more usable space in the attic (relative to traditional roof trusses), minimal roof structure and a surface to mount a floor deck to (for example loft boarding or the like).

[0278] A sixth benefit of the new roof structure 100 is that loft hatches can be pre-fitted, sving labour intensive work in creating such a loft hatch.

[0279] A seventh benefit of the new roof structure 100 is that an entire roof (or even multiple roofs) can be delivered flat-packed to site on a single lorry. In contrast, traditional roof truss structures can require several lorries as they are rather bulky.

[0280] An eighth benefit of the new roof structure 100 is that there is an option for a prefinished version. Advantageously, this may mean that no site tiling is required.

[0281] An ninth benefit of the new roof structure 100 is that the roof space is immediately ready for the homeowner to deck out and / or it is an attractive feature for the house builder.

[0282] In addition to the advantages discussed above, if it is desired or intended for the space within the roof structure 100 to be used as a plant room (for example new houses are increasingly being built such that a hot water tank, batteries and / or inverters are disposed in the roof space) then the new roof structure 100 has the following additional advantages.

[0283] First, the plant can be installed in the roof structure 100 at ground level and be lifted with the roof structure 100 into place. Second, the plant area can be watertight from the start, which avoids sequencing issues. In contrast, the only way to get a plant in a truss roof while it is dry is up through the loft hatch which may have its own health and safety issues. Third, no separate platform is required to support the plant, which saves on cost. Fourth, access to the plant will be good. Fifth, it is easy to create a warm zone in the roof space of the roof structure 100 (this could be done at ground level).

[0284] While specific embodiments of the invention have been described above, it will be appreciated that the invention may be practiced otherwise than as described. The descriptions above are intended to be illustrative, not limiting. Thus it will be apparent to one skilled in the art that modifications may be made to the invention as described without departing from the scope of the claims set out below.

[0285] Some aspects of embodiments of the present disclosure are specified in the following set of numbered paragraphs:

[0286] 1. A collapsible roof structure comprising: a support structure; a first roof member; and a second roof member; wherein the first roof member is rotatably connected to the support structure proximate a first side of the support structure and the second roof member is rotatably connected to the support structure proximate a second side of the support structure, the first and second sides being opposed and separated in a first direction, and wherein there is at least some overlap between the first and second roof members in a second direction generally perpendicular to the first direction, such that the collapsible roof structure is configurable in at least: a first configuration in which a distal end of each of the first and second roof members is proximate to the support structure; and a second configuration in which a distal end of the first roof member is in contact with a distal end of the second roof member and in which the distal ends of the first and second roof members are at substantially the same distance from the support structure.

[0287] 2. A collapsible roof structure comprising: a support structure; a first roof member; and at least one hinge member; wherein the first roof member is rotatably connected to the support structure via the at least one hinge member proximate a first side of the support structure, such that an angle between the first roof member and the support structure can be varied; and wherein the at least one hinge member is connected to the first roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the first roof member relative to the support structure.

[0288] 3. The collapsible roof structure of paragraph 2 further comprising: a second roof member; and at least one second hinge member; wherein the second roof member is rotatably connected to the support structure via the at least one second hinge member proximate a second side of the support structure, such that an angle between the second roof member and the support structure can be varied; and wherein the at least one second hinge member is connected to the second roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the second roof member relative to the support structure.

[0289] 4. The collapsible roof structure of paragraph 1 wherein, at least when disposed in one configuration, a distance between a plane of the support structure and a pivot of the first roof member is different to a distance between a plane of the support structure and a pivot of the second roof member.

[0290] 5. A collapsible roof structure comprising: a support structure; a first roof member; and a second roof member; wherein the first roof member is rotatably connected to the support structure proximate a first side of the support structure and the second roof member is rotatably connected to the support structure proximate a second side of the support structure, the first and second sides being opposed and separated in a first direction, such that the collapsible roof structure is configurable in at least: a first configuration in which a distal end of each of the first and second roof members is proximate to the support structure; and a second configuration in which a distal end of the first roof member is in contact with a distal end of the second roof member and in which the distal ends of the first and second roof members are at substantially the same distance from the support structure; and wherein, at least when disposed in the first configuration, a distance between a plane of the support structure and a pivot of the first roof member is different to a distance between a plane of the support structure and a pivot of the second roof member.

[0291] 6. The collapsible roof structure of paragraph 5 wherein a height of the support structure proximate the first side of the support structure is different to a height of the support structure proximate the second side of the support structure.

[0292] 7. The collapsible roof structure of paragraph 5 wherein at least one of the first roof member and second roof member is rotatably connected to the support structure via at least one hinge member that allows for the first or second pivot respectively to be movable relative to the support structure.

[0293] 8. The collapsible roof structure of any preceding paragraph when dependent either directly or indirectly on paragraph 1 or paragraph 5 wherein the first roof member is rotatably connected to the support structure via at least one first hinge member.

[0294] 9. The collapsible roof structure of any preceding paragraph when dependent either directly or indirectly on paragraph 1 or paragraph 5 wherein the second roof member is rotatably connected to the support structure via at least one second hinge member.

[0295] 10. The collapsible roof structure of paragraph 8 or paragraph 9 wherein the or each hinge member is connected to the respective roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the respective roof member relative to the support structure.

[0296] 11. The collapsible roof structure of any one of paragraphs 2, 3 or 8 to 10 wherein the or each hinge member comprises a sheet metal comprising a first portion that is fixed to the support structure and a second portion that is fixed to the roof member.

[0297] 12. The collapsible roof structure of paragraph 11 wherein the first portion is fixed to a beam member that forms part of the support structure. 13. The collapsible roof structure of paragraph 12 wherein the first portion is fixed to two surfaces of the beam member that forms part of the support structure.

[0298] 14. The collapsible roof structure of any one of paragraphs 11 to 13 wherein the second portion is fixed to a surface of each of a plurality of rafters that form part of the roof member.

[0299] 15. The collapsible roof structure of any one of paragraphs 11 to 14 wherein the or each hinge member comprises one or more third portions, each of which is generally perpendicular to the second portion.

[0300] 16. The collapsible roof structure of any preceding paragraph wherein the support structure comprises two generally parallel beam members separated in the first direction and one or more members spanning between, and supported by, the two parallel beam members.

[0301] 17. The collapsible roof structure of any preceding paragraph wherein the two beam members comprise insulating material.

[0302] 18. The collapsible roof structure of any preceding paragraph wherein the support structure comprises a generally rectangular thermal barrier across substantially the entire footprint of the support structure.

[0303] 19. The collapsible roof structure of any preceding paragraph wherein the or each roof member comprises a support member pivotally attached to a portion of the roof member such that: when the collapsible roof structure is disposed in the first configuration the support member can be generally parallel to the support structure; and when the collapsible roof structure is disposed in the second configuration the support member can be generally perpendicular to the support structure such that a distal end of the support member is in contact with the support member.

[0304] 20. The collapsible roof structure of paragraph 19 wherein the support structure comprises a location feature for the support member of the or each roof member.

[0305] 21. The collapsible roof structure of paragraph 20 wherein the location feature for the support member of the or each roof member is pivotally attached to a main portion of the support structure.

[0306] 22. The collapsible roof structure of paragraph 20 or paragraph 21 when dependent either directly or indirectly on any one of paragraphs 1, 3 or 5 wherein the support member of one of the first roof member and the second roof member is adjustable in length.

[0307] 23. The collapsible roof structure of any preceding paragraph wherein the or each roof member comprises a plurality of generally parallel rafters. 24. The collapsible roof structure of paragraph 23 wherein the or each roof member further comprises a ridge member extending generally perpendicular to the plurality of rafters at a first end thereof.

[0308] 25. The collapsible roof structure of paragraph 24 when dependent either directly or indirectly on any one of paragraphs 1 , 3 or 5 wherein the ridge member of the first roof member and / or the second roof member comprises engagement features to allow for the distal ends of the first roof member and the second roof member to mutually engage.

[0309] 26. The collapsible roof structure of any preceding paragraph wherein at least one roof member comprises a membrane.

[0310] 27. The collapsible roof structure of paragraph 26 when dependent either directly or indirectly on any one of paragraphs 1, 3 or 5 wherein at least one of the first roof member and the second roof member comprises a portion of a membrane that extends beyond a distal end of the roof member and wherein the collapsible roof structure further comprises a weight attached to the portion of the membrane that extends beyond a distal end of the roof member.

[0311] 28. The collapsible roof structure of any one of paragraphs 19 to 27 when dependent either directly or indirectly on any one of paragraphs 1 , 3 or 5 wherein each of the first and second roof members comprises a tie member pivotally attached to a portion of that roof member such that: when the collapsible roof structure is disposed in the first configuration the tie members can be generally parallel to the roof member; and when the collapsible roof structure is disposed in the second configuration the tie members can be generally mutually parallel and such that a distal end of the two tie members are in contact with each other.

[0312] 29. A method of forming a roof structure, the method comprising: providing a collapsible roof structure of any preceding paragraph when dependent either directly or indirectly on any one of paragraphs 1, 3 or 5, the collapsible roof structure disposed in the first configuration; rotating the first roof member relative to the support structure to an intermediate position wherein the distal end of the first roof member is farther from the support structure than when disposed in the second configuration; rotating the second roof member relative to the support structure a position corresponding to the second configuration; and rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration. 30. The method of paragraph 29 further comprising rotating a support member of each roof member such that the support member is generally perpendicular to, and in contact with, the support structure.

[0313] 31. The method of paragraph 30 further comprising mechanically fixing the support member of each roof member to the support structure.

[0314] 32. The method of any one of paragraphs 29 to 31 wherein the step of rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration comprises reducing a length of the support member of the first roof member.

[0315] 33. The method of any one of paragraphs 29 to 32 wherein the step of rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration comprises removing a temporary spacer member.

[0316] 34. The method of any one of paragraphs 29 to 33 further comprising fixing a second portion of the or each hinge member to the support structure.

[0317] 35. The method of any one of paragraphs 29 to 34 further comprising mutually engaging the distal ends of the first roof member and the second roof member.

[0318] 36. The method of any one of paragraphs 29 to 35 further comprising rotating a tie member of each roof member such that the two tie members are generally mutually parallel and such that a distal end of the two tie members are in contact with each other.

[0319] 37. The method of paragraph 36 further comprising mechanically fixing the two tie members together.

Claims

CLAIMS:

1. A collapsible roof structure comprising: a support structure; at least one roof member; and at least one hinge member for the or each at least one roof member; wherein the or each roof member is rotatably connected to the support structure via the at least one corresponding hinge member proximate a side of the support structure, such that an angle between the or each roof member and the support structure can be varied; and wherein the at least one hinge member is such that: (a) the or each roof member can rotate relative to the support structure such that an axis of rotation or pivot of the or each roof member can move relative to the support structure; and / or (b) the of each roof member can rotate relative to the support structure about more than one pivot or axis of rotation.

2. The collapsible roof structure of any preceding claim wherein the or each at least one hinge member is connected to a corresponding one of the at least one roof member and / or the support structure using one or more fixings that are generally perpendicular to an axis or pivot of rotation of the corresponding roof member relative to the support structure.

3. The collapsible roof structure of claim 1 or claim 2 wherein the or each hinge member comprises a first portion that is attached to the support structure and a second portion that is attached to the roof member.

4. The collapsible roof structure of claim 3 wherein the or each at least one hinge member defines a main axis of rotation of the roof member to which it is attached and wherein the attachment of said hinge member to the support structure and / or the roof member allows for a limited range of relative movement between the hinge member and the support structure and / or a limited range of relative movement between the hinge member and the roof member.

5. The collapsible roof structure of claim 4 wherein the limited range of relative movement between the hinge member and the support structure and / or the limitedrange of relative movement between the hinge member and the roof member allows the roof member to rotate relative to the support structure about a second axis of rotation.

6. The collapsible roof structure of claim 3 wherein the or each at least one hinge member defines a main axis of rotation and a second axis of rotation of the roof member to which it is attached.

7. The collapsible roof structure of claim 5 or claim 6 wherein the or each at least one hinge member comprises an arrangement for limiting a rotation of the hinge member about the second axis of rotation.

8. The collapsible roof structure of claim 7 wherein the arrangement for limiting a rotation of the hinge member about the second axis of rotation comprises one or more slots in the hinge member through which the hinge member is attached to the support structure or a corresponding roof member.

9. The collapsible roof structure of any one of claims 3 to 8 wherein the or each hinge member comprises sheet metal.

10. The collapsible roof structure of claim 9 wherein rotation of the roof member relative to the beam member is achieved by folding or bending the sheet metal.

11. The collapsible roof structure of claim 9 or claim 10 wherein the sheet metal is perforated to aid bending or folding and to define an axis or pivot of rotation.

12. The collapsible roof structure of any one of claims 3 to 11 wherein the first portion is attached to a beam member that forms part of the support structure.

13. The collapsible roof structure of claim 12 wherein the first portion is attached to two surfaces of the beam member that forms part of the support structure.

14. The collapsible roof structure of any one of claims 3 to 13 wherein the second portion is attached to a surface of each of a plurality of rafters that form part of the roof member.

15. The collapsible roof structure of any one of claims 3 to 14 wherein the or each hinge member comprises one or more third portions, each of which is generally perpendicular to the second portion.

16. The collapsible roof structure of any preceding claim comprising: a first roof member; at least one first hinge member; a second roof member; and at least one second hinge member; wherein the first roof member is rotatably connected to the support structure via the at least one first hinge member proximate a first side of the support structure, such that an angle between the first roof member and the support structure can be varied; and wherein the second roof member is rotatably connected to the support structure via the at least one second hinge member proximate a second side of the support structure, such that an angle between the second roof member and the support structure can be varied.

17. The collapsible roof structure of claim 16 wherein the first roof member is rotatably connected to the support structure proximate a first side of the support structure and the second roof member is rotatably connected to the support structure proximate a second side of the support structure, the first and second sides being opposed and separated in a first direction, such that the collapsible roof structure is configurable in at least: a first configuration in which a distal end of each of the first and second roof members is proximate to the support structure; and a second configuration in which a distal end of the first roof member is in contact with a distal end of the second roof member and in which the distal ends of the first and second roof members are at substantially the same distance from the support structure.

18. The collapsible roof structure of claim 17 wherein, at least when disposed in the first configuration, a distance between a plane of the support structure and a pivot ofthe first roof member is different to a distance between a plane of the support structure and a pivot of the second roof member.

19. The collapsible roof structure of claim 18 wherein a height of the support structure proximate the first side of the support structure is different to a height of the support structure proximate the second side of the support structure.

20. The collapsible roof structure of any one of claims 17 to 19 wherein there is at least some overlap between the first and second roof members in a second direction generally perpendicular to the first direction.

21. The collapsible roof structure of any one of claims 17 to 20 wherein when the roof structure is disposed in the second configuration, a portion of each of the first and second roof members is parallel to and supported by a portion of the support structure.

22. The collapsible roof structure of any preceding claim when dependent either directly or indirectly on claim 17 wherein the support structure comprises two generally parallel beam members separated in the first direction and one or more members spanning between, and supported by, the two parallel beam members.

23. The collapsible roof structure of claim 22 wherein the two beam members comprise insulating material.

24. The collapsible roof structure of any preceding claim wherein the support structure comprises a generally rectangular thermal barrier across substantially the entire footprint of the support structure.

25. The collapsible roof structure of any preceding claim wherein the or each roof member comprises a support member pivotally attached to a portion of the roof member such that: when the collapsible roof structure is disposed in the first configuration the support member can be generally parallel to the support structure; and when the collapsible roof structure is disposed in the second configuration the support member can be generally perpendicular to the support structure such that a distal end of the support member is in contact with the support member.

26. The collapsible roof structure of claim 25 wherein the support structure comprises a location feature for the support member of the or each roof member.

27. The collapsible roof structure of claim 26 wherein the location feature for the support member of the or each roof member is pivotally attached to a main portion of the support structure.

28. The collapsible roof structure of claim 26 or claim 27 wherein the support member of one of the first roof member and the second roof member is adjustable in length.

29. The collapsible roof structure of any preceding claim wherein the or each roof member comprises a plurality of generally parallel rafters.

30. The collapsible roof structure of claim 29 wherein the or each roof member further comprises a ridge member extending generally perpendicular to the plurality of rafters at a first end thereof.

31. The collapsible roof structure of claim 30 when dependent either directly or indirectly on claim 16 wherein the ridge member of the first roof member and / or the second roof member comprises engagement features to allow for the distal ends of the first roof member and the second roof member to mutually engage.

32. The collapsible roof structure of any preceding claim wherein at least one roof member comprises a membrane.

33. The collapsible roof structure of claim 32 when dependent either directly or indirectly on claim 16 wherein at least one of the first roof member and the second roof member comprises a portion of a membrane that extends beyond a distal end of the roof member and wherein the collapsible roof structure further comprises a weight attached to the portion of the membrane that extends beyond a distal end of the roof member.

34. The collapsible roof structure of any one of claims 25 to 33 when dependent either directly or indirectly claim 16 wherein each of the first and second roof memberscomprises a tie member pivotally attached to a portion of that roof member such that: when the collapsible roof structure is disposed in the first configuration the tie members can be generally parallel to the roof member; and when the collapsible roof structure is disposed in the second configuration the tie members can be generally mutually parallel and such that a distal end of the two tie members are in contact with each other.

35. A method of forming a roof structure, the method comprising: providing a collapsible roof structure of any preceding claim when dependent either directly or indirectly on claim 16, the collapsible roof structure disposed in the first configuration; rotating the first roof member relative to the support structure to an intermediate position wherein the distal end of the first roof member is farther from the support structure than when disposed in the second configuration; rotating the second roof member relative to the support structure a position corresponding to the second configuration; and rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration.

36. A method of forming a roof structure, the method comprising: providing a collapsible roof structure of any one of claims 1 to 34, the collapsible roof structure disposed in a first configuration; rotating a first roof member relative to the support structure about a first pivot or axis of rotation to a second configuration; rotating the first roof member relative to the support structure about a second pivot or axis of rotation to an intermediate position wherein the distal end of the first roof member is farther from the support structure than when disposed in the second configuration; and rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration.

37. The method of claim 36 wherein the collapsible roof structure is the collapsible roof structure of any one of claims 1 to 35 when dependent either directly or indirectly on claim 16, the method further comprising:while the first roof member is disposed in the intermediate position, rotating a second roof member relative to the support structure about another first pivot or axis of rotation to a position corresponding to the second configuration.

38. The method of claim 35 or claim 37 further comprising rotating a support member of each roof member such that the support member is generally perpendicular to, and in contact with, the support structure.

39. The method of claim 28 further comprising mechanically fixing the support member of each roof member to the support structure.

40. The method of any preceding claim when dependent either directly or indirectly on claim 35 or claim 37 wherein the step of rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration comprises reducing a length of the support member of the first roof member.

41. The method of any preceding claim when dependent either directly or indirectly on claim 35 or claim 37 wherein the step of rotating the first roof member relative to the support structure from the intermediate position back to a position corresponding to the second configuration comprises removing a temporary spacer member.

42. The method of any preceding claim when dependent either directly or indirectly on claim 35 or claim 37 further comprising fixing a second portion of the or each hinge member to the support structure.

43. The method of any preceding claim when dependent either directly or indirectly on claim 35 or claim 37 further comprising mutually engaging the distal ends of the first roof member and the second roof member.

44. The method of any preceding claim when dependent either directly or indirectly on claim 35 or claim 37 further comprising rotating a tie member of each roof member such that the two tie members are generally mutually parallel and such that a distal end of the two tie members are in contact with each other.

45. The method of claim 44 further comprising mechanically fixing the two tie members together.

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