Thermal insulation system for walls or roofs comprising a support structure and thermal insulation

Abstract

The invention relates to a thermal insulation device (10) for a wall envelope (9) or a roof (4) of a building and comprising for this purpose at least one rigid support structure (20) intended to be attached to a load-bearing element (6; 7;8) of said wall envelope (9) or of said roof (4) and thermal insulation (30) carried by said support structure (20), characterized in that the thermal insulation (30) comprises at least one flexible outer envelope enclosing an insulating material and provided around its perimeter with at least two prominent opposing attachment members, and the rigid support structure (20) comprises at least two longitudinal profiles in the general form of a rail intended to be fixed to the wall envelope (9) or the roof (4) to be insulated, said rails respectively comprising facing attachment means for each receiving a longitudinal securing element adapted on the one hand to be inserted removably into the respective opposing attachment members of the flexible outer envelope and on the other hand to cooperate with said attachment means so as to attach said thermal insulation (30) to the rigid support structure (20). Figure for the abbreviation: Fig. 20;

Description

Title of the invention: Thermal insulation device for walls or roofs comprising a support structure and thermal insulation. Technical field of the invention

[0001] The present invention relates to the thermal insulation of buildings such as dwellings, offices, shops or private or public industrial buildings. Previous technique

[0002] In the field of construction or renovation of buildings with an exposed or semi-exposed structure (metal, wood or concrete frame), it is useful or even necessary to insulate the walls which may allow heat or cold to pass / transmit from the outside to the inside and vice versa in order in particular to provide living / working comfort for people and / or to save the energy used to cool or heat the inside of these buildings.

[0003] Many solutions already exist such as the use of semi-rigid plates based for example on polystyrene (extruded or expanded), rolls of natural fibers (glass, rock), multi-layer thin films, bales of straw or natural wool, or the projection of powdered or flake material.

[0004] There are also so-called "external" thermal insulation devices which may require a repair of the waterproofing.

[0005] Current solutions are still impractical and quick to install, not versatile enough and easily adaptable to all types of buildings, or unsuitable for the renovation of existing buildings that are not insulated or are very poorly insulated from the inside without having to carry out structural reinforcement.

[0006] Moreover, from an aesthetic and / or acoustic point of view, current solutions do not yet give complete satisfaction. Presentation of the invention

[0007] The present invention aims to remedy these drawbacks with a totally innovative approach and a simple, lightweight, adaptable / versatile and efficient solution.

[0008] To this end, according to a first aspect, the present invention relates to a thermal insulation device for a wall envelope or a building roof and comprising for this purpose at least one rigid support structure intended to be attached to a load-bearing element of said wall envelope or said roof and thermal insulation carried by said support structure, characterized in that: - the thermal insulation comprises at least one flexible outer casing enclosing an insulating material and provided around its perimeter with at least two prominent opposing attachment points, and - the rigid support structure comprises at least two longitudinal profiles in the general form of a rail intended to be fixed to the wall envelope or roof to be insulated, said rails having respectively facing attachment means to receive each a long, slender safety element adapted on the one hand to be inserted removably into the respective opposite attachment members of the flexible outer envelope and on the other hand to cooperate with said attachment means so as to attach said thermal insulation to the rigid support structure following a tensile action exerted on said attachment members by means of said long, slender safety element in order to make the latter penetrate the attachment means to be held there.

[0009] This solution allows for easy, reliable, quick, and highly versatile installation of thermal insulation for walls or roofs, the insulation being able to be replaced in certain situations due to the removable nature of the fastening elements.

[0010] The invention is implemented according to the embodiments and variants set out below, which are to be considered individually or according to any technically operative combination.

[0011] Advantageously, the attachment members of the flexible outer casing consist of tabs folded back on themselves in the form of a handle and having an opening adapted to receive said longline securing element.

[0012] This solution is simple to implement and to operate by the person installing it.

[0013] According to a preferred embodiment of the present invention, the long-lined securing element is a straight rod with a constant cross-section, preferably circular, and the opening of each attachment member includes a hollow tube of the same cross-section as the rod in order to receive the latter.

[0014] This solution is simple to design, reliable and practical.

[0015] Advantageously, the rigid support structure consists of two metal rails intended to be fixed firmly in parallel to each other on the wall envelope or roof of the building to be insulated, each means of attaching a rail considered being made up of different portions of metal folded locally on each other to form a longitudinal channel for receiving said longline safety element.

[0016] In addition, each longitudinal rail is in the form of a central strip provided locally, along at least one of its two opposite longitudinal edges, with attachment means, each formed by an extension transverse extension of material extended by a first fold at approximately 90° forming a first portion extended by a second internal fold at approximately 90° forming a second portion, so that the transverse extension, the first fold and the second fold define a "U" shaped channel.

[0017] According to a particular embodiment of the present invention, the second fold is extended by a third fold at approximately 90° directed opposite the central band to form a prominent "L" shaped wing erected perpendicularly to said central band.

[0018] According to a particularly interesting aspect of the present invention, the two longitudinal edges of each metal rail are each provided with hooking means assembled in pairs whose respective U-shaped channels face each other.

[0019] This solution allows thermal insulation to be installed on both sides of the same rail to cover a larger area.

[0020] In addition, each metal rail is provided with several pairs of longitudinally extending hooking means, with a space measuring at least the width of one fastening element being provided between the channels of two consecutive hooking means.

[0021] This solution allows better attachment of the thermal insulation to its support structure by distributing the attachment forces and / or covering large dimensions of wall / roof to be insulated.

[0022] In addition, each flexible outer envelope of a thermal insulation comprises a multitude of attachment elements, each cooperating with an inter-duct space.

[0023] Advantageously, the longitudinal rail is covered with a thermal break, such as a felt strip.

[0024] According to a particular aspect, the thermal break is a felt strip covered with a sheet metal and held laterally in place by pairs of material studs provided on the longitudinal rail.

[0025] Preferably, said thermal insulating material is of the blown type and the flexible outer envelope is a membrane or a flexible fabric, preferably plasticized to be easily cleaned and fire resistant of class MO or Ml, the whole taking substantially the form of a parallelepiped-shaped cushion.

[0026] The present invention also relates to a thermal insulation method for a building wall envelope or roof, using the thermal insulation device as described above, and consisting of: - firmly fix at least two longitudinal profiles opposite each other onto the wall or roof to be insulated, - insert a first elongated securing element into a first attachment point of the flexible outer casing, - to insert the first long, narrow securing element into the corresponding attachment point of a first longitudinal profile, - insert a second elongated securing element into a second attachment point of the flexible outer casing opposite the first attachment point, - exert a tensile force on the second longitudinal securing element substantially perpendicular to its elongation direction in order to make it penetrate a fastening means of the second longitudinal profile by pulling on the attachment members of the flexible outer casing, and - release the tensile force exerted on the second longitudinal securing element once the latter is correctly positioned and locked in the attachment means of the second longitudinal profile. Brief description of the figures

[0027] Other advantages, purposes and features of the present invention will become apparent from the following description, given for explanatory purposes and in no way as a limitation, with reference to the accompanying drawings, in which:

[0028] [Fig-1] [Fig.1] is a perspective view of a room comprising at least one wall lateral and a frame to be thermally insulated,

[0029] [Fig.2] [Fig.2] is a perspective view of a metal rail belonging to a thermal insulation device according to the present invention,

[0030] [Fig. 3] [Fig. 3] is a perspective view of the rail of [Fig. 2] fixed under a beam in I of the framework of the [Fig.l],

[0031] [Fig.4] [Fig.4] is a front view of [Fig.3],

[0032] [Fig. 5] [Fig. 5] is a perspective view of a thermal insulator in the shape of cushion belonging to the device according to the present invention,

[0033] [Fig.6] [Fig.6] is a perspective view of a long, narrow securing element in the form of a rod belonging to the device according to the present invention,

[0034] [Fig.7] [Fig.7] is a perspective view of a shaping tool handle belonging to the device according to the present invention,

[0035] [Fig.8] [Fig.8] is a perspective view of a first stage of attaching the cushion of [Fig.5] on a rail of [Fig.2],

[0036] [Fig.9] [Fig.9] is a side view of [Fig.8],

[0037] [Fig. 10] [Fig. 10] is a detail view of [Fig. 8] with the handle in use,

[0038] [Fig. 11] [Fig. 11] is a perspective view of a second attachment stage of the cushion [Fig. 5] on a second rail fixed to a second beam,

[0039] [Fig.12] [Fig.12] is a front view of [Fig.11],

[0040] [Fig. 13] [Fig. 13] is a detailed perspective view of [Fig. 11] with the handle in use,

[0041] [Fig. 14] [Fig. 14] is a perspective view of a rail of [Fig. 2] fixed under a Z-beam,

[0042] [Fig.15] [Fig.15] is a front view of [Fig.14],

[0043] [Fig. 16] [Fig. 16] is a perspective view of a cushion suspended from two rails fixed under two Z-shaped beams,

[0044] [Fig.17] [Fig.17] is a front view of [Fig.16],

[0045] [Fig. 18] [Fig. 18] is an exploded perspective view of an alternative embodiment of the rail of [Fig.2],

[0046] [Fig. 19] [Fig. 19] is a perspective view of [Fig. 18],

[0047] [Fig.20] [Fig.20] is an interior perspective view of a room, one wall of which is equipped with a thermal insulation device conforming to the present invention. Description of the implementation methods

[0048] Firstly, the present description is given by way of non-limiting, each feature of an embodiment being able to be combined with any other feature of any other embodiment described and / or represented.

[0049] It is also noted from the outset that the figures are not necessarily to scale, without this affecting their understanding.

[0050] Fig. 1 represents a part 1 intended to receive a thermal insulation device 10 according to the present invention. This part 1, for example a warehouse or an industrial building, typically comprises a floor 2, at least one side wall 3 and a roof structure 4 comprising in particular several transverse purlins 5 (e.g., wall plate, ridge and intermediate purlins) on which rafters 6 are fixed perpendicularly, which may or may not support transverse battens parallel to the purlins.

[0051] In the following description, the insulation device 10 is adapted to be hung under these rafters 6, but it can just as easily be installed in other places in the room, for example along vertical beams 7 or horizontal beams 8 of a partition 9. The transverse purlins 5, rafters 6 and vertical beams 7 can be made of wood or metal (galvanized steel, zinc), or wood, depending on the type of framework and building on which it is planned to install the thermal insulation device 10.

[0052] As can be seen in Figures 2 to 6, the thermal insulation device 10 comprises at least two main elements, namely a support structure 20, intended to be firmly fixed to the rafters of the frame 4 considered, and a cushion-shaped thermal insulator 30 intended to be removably attached to said support structure 20.

[0053] More specifically, the rigid support structure 20 comprises at least two longitudinal metal profiles 21 (stainless steel or galvanized steel, for example) each in the general form of an elongated rail measuring a few centimeters in width (once formed after folding), typically between about 5 and about 12 centimeters and preferably between about 6 and 8 centimeters, over several tens of centimeters in length, typically between about 1 meter and more than 2 meters, depending on the size of the thermal insulation 30 to be hung and the dimension / spacing of the rafters 6 where the device 10 will be fixed.

[0054] In the present case, each elongated rail 21 comprises a flat longitudinal central strip 22 of metal measuring approximately 40 millimeters wide by approximately 1 to 2 millimeters thick. This central metal strip 22 is provided locally, along two opposing longitudinal edges 23, with a series of attachment means 24 initially formed, that is, before folding, by two pairs of extensions (protrusions) projecting laterally from the central strip 22 and facing each other, each extension measuring approximately 150 millimeters long by approximately 51 to 52 millimeters wide and thus extending on either side of said main strip 22. Each profile 21 therefore measures locally (at the location of the attachment means 24) approximately 142 to 144 mm wide before the successive foldings described below.

[0055] More specifically, each attachment means 24 is formed by a lateral / transverse extension 25 of material measuring approximately 12 millimeters in width, extended by a first fold at approximately 90° forming a first portion 26 measuring approximately 12 millimeters in height, extended by a second internal fold, also at approximately 90°, forming a second portion 27 measuring 12 millimeters in width in order to form a U-shaped channel G intended to receive a long, narrow securing element 40 (see [Fig.6]), said second portion 27 being then extended by a third fold 28 at 90°, directed opposite the central band 22, to form a prominent L-shaped wing erected perpendicularly to said central band 22 and measuring approximately 15 millimeters in height.

[0056] Two facing attachment means 24 provided on the two opposite lateral edges 23 thus form a pair, the respective "U" shaped openings of the channels G of each attachment means 24 then face each other to receive each a metal rod 40.

[0057] In the end, the profile 21 equipped with its various pairs of facing attachment means 24 measures approximately 64 millimeters in width for approximately 27.8 millimeters in height (overall thickness).

[0058] The pairs of fastening means 24 are spaced longitudinally, preferably regularly, by a gap 24b of a few centimeters, for example approximately 10 to 15 centimeters. There can be as many pairs of attachment means 24 as desired per longitudinal profile 21.

[0059] Through holes 12 are provided in the central band 22, at the level of the different pairs of fastening means 24, to fix the longitudinal profile 21 (for example by screwing, nailing, or riveting, supplemented if necessary by gluing) on ​​a lower face 6b of the corresponding beam 6, as illustrated by figures 3 and 4, the fastening means 24 then all being oriented towards the ground 2 (in the case of fixing on a vertical beam 7, the fastening means are oriented towards the inside of the part 1).

[0060] The thermal insulation 30 shown in [Fig. 5] comprises a flexible outer casing 31, for example a coated (plasticized) fabric or canvas membrane for easy cleaning and fire resistance of class M0 or M1, substantially in the form of an individual parallelepiped-shaped cushion. The flexible outer casing 31 is filled with blown insulating material of a known type (not shown).

[0061] The flexible outer casing 31 is further provided around its periphery 32 with several prominent attachment elements 33 arranged oppositely and consisting of tabs 34 preferably made of the same resistant fabric as the outer casing 31, these tabs 34 being folded back on themselves and sewn onto the flexible outer casing 31 to form handles / loops. Each handle 34 thus has an internal passage 35 adapted to receive a long, slender locking element 40 in the form of a metal bar of constant cross-section, for example round or square (see [Fig. 6]).

[0062] The opening 35 of each handle 34 is provided with a rigid tube 36, for example a PVC tube bonded to the fabric, acting as reinforcement and, more importantly, as a guide and retaining sleeve for the rod 40 intended to be inserted inside all of these tubes. Thus, as will be described in more detail later, the metal rod 40 can be easily inserted into the various handles 34 without damaging them (risk of tearing the fabric by the metal), by passing through each of the tubes 36. These tubes also allow for a better distribution of the tensile force required to pull on the handles 34.

[0063] To this end, a tool 50 for positioning the thermal insulation pad 30 on the longitudinal rails 21, particularly by pulling, is shown in [Fig. 7]. This tool 50, halfway between a handle and a lever, comprises a rigid, flat, perforated metal structure having first pushing means 51 at a first end 50a and second pulling means 52 at a second opposite end 50b. More specifically, the first pushing means 51 comprises two spaced pairs of fingers 53 and 54 spread apart and facing each other parallel to form a kind of clamp, while the second means of traction 52 includes folding portions 55, 56 and 57 forming a kind of hook.

[0064] A method for installing the thermal insulation device 10 of Figures 2, 5 and 6 herein is illustrated by Figures 8 to 13. In the case shown, the flexible outer casing 31 has a shape adapted so that the thermal insulation 30 is wedged between the webs of the IPE 6 beams. For this purpose, the flexible outer casing 31 has a lateral notch 31a and a lateral protrusion 31b on each of its attachment sides, i.e. where the handles 34 are located.

[0065] More specifically, in a first step, the installer fixes two longitudinal rails (profiles) 21, identical in the present case, fixed under the lower face 6b of two adjacent IPE 6 metal beams so as to form the rigid support structure 20 of the thermal insulation device 10. Preferably, the installer fixes longitudinal rails 21 along all the beams 6 in order to cover the entire underside of the roof 4 to be thermally insulated.

[0066] The distance between two consecutive longitudinal rails 21 is substantially identical to the median distance D between two adjacent beams 6, which distance D is slightly greater than the width L of the external flexible envelope 31 of the thermal insulation 30.

[0067] It will also be noted that the dimension of the spacing between the first portions 26 of two adjacent longitudinal rails 21 is slightly less than the distance T between virtual axes XX passing through the opposite tubes 36 of the same thermal insulation 30 in order to be able to install the latter in the hanging means 24.

[0068] A first long, narrow securing element 40 ([Fig. 6]) is inserted into all the tubes 36 on one side of the flexible outer casing 31. It should be noted that in this state, the longitudinal axis of the metal rod 40 is aligned with the axis XX' of said first tubes 26. The assembly thus formed is brought close to a first longitudinal rail 21 (the one on the left in Figures 8 to 10), and the two clamps 53 / 54 of the first pushing means 51 of the assembly tool 50 allow the entire rod 40 to be correctly positioned inside the U-shaped channel G (parts 25, 26, and 27) of the various attachment means 24 (large arrow in [Fig. 10]). The handles 34 are placed in the voids 24b of said longitudinal rail 21, while the clamps 53 / 54 are positioned on either side of the said handle in question.

[0069] Thanks to a pivoting (arrows illustrating rotation of [Fig. 10]) exerted by the mounting tool 50, which at this moment supports the entire metal rod 40 and also the thermal insulation 30, said rod 40 is placed at the bottom of the fastening means 24, i.e. against the first folding wall 26, and remains stuck there.

[0070] Depending on the length of the longitudinal rail 21 and the number of attachment points 24 arranged along it, it is advisable to use several mounting tools 50 spaced apart simultaneously to insert the metal rod 40 into the U-shaped channels provided for this purpose. Two installers can thus work together if necessary. The flexible outer layer 31 of the thermal insulation is then attached / suspended under a first longitudinal rail 21 of a first IPE 6 beam, as illustrated in Figures 8 and 9.

[0071] In a subsequent step illustrated by figures 11 to 13 (end of said step), a second longline securing element 40 (metal rod) is first inserted into all the tubes 36 on a second opposite side of the flexible outer casing 31. It should be noted in this regard that the longitudinal axis of the second metal rod 40 is aligned with the axis XX' of said second tubes 26.

[0072] The installer then places the mounting tool 50 around the second rod 50, positioning the traction means 52 (hooks 55, 56, and 57) behind it ([Fig. 13]). Using the tool 50, as illustrated by arrow R in [Fig. 9], the installer pivots the flexible outer casing 31, now equipped with its second metal rod 50, around the first metal rod 50 (which thus acts as a pivot), lifting the flexible outer casing 31. Simultaneously, the installer applies a traction force F to the mounting tool 50, which pulls on the handles 34 via the second metal rod 40, causing it to pass behind the wall 28 of all the attachment means 24. This is made possible by the elasticity of the flexible outer casing 31 (or possibly only its handles). 34).

[0073] Once the second metal rod 50 has passed the various folding walls 28 and is positioned in view of the U-shaped channels of the attachment means 24 (folding walls 26 and 27), the user can release his traction force F so that said metal rod 40 comes to position itself against the first folding wall 26 of said U-shaped channels G, exerting tension on the handles 34 of the flexible outer casing 31, allowing the thermal insulation 30 to remain in position ([Fig. 11] and 12) by being "stretched" between two adjacent longitudinal rails. The thermal insulation 30 is also held in this position by the lateral protrusions 31b which come together against the central webs of the IPE 6 beams, as illustrated by figures 9, 11 and 12. The thermal insulation 30 therefore cannot fall to the ground.

[0074] Thus, a first section of the roof 4 can be easily thermally insulated. The installer repeats these steps as many times as necessary to attach other thermal insulation 30s between the IPE beams 6. It should be noted that each thermal insulation 30 is independent of the others and can be removed, if necessary, by pulling (arrow F) using one or more mounting tools 50 on one of the two metal rods 40 in order to make it come out of the "U" shaped channels of the attachment means 24 to return to the position illustrated for example by [Fig.8].

[0075] According to the embodiment illustrated in Figures 14 to 17, the thermal insulators 30 are attached to longitudinal rails 21 fixed under so-called "Z-shaped" profiles, transverse purlins 5, or vertical posts by any known means (screws or rivets, for example). The installation method for the thermal insulators 30 of the device 10 according to the present invention is similar to that described above.

[0076] According to an improvement illustrated in Figures 18 and 19, a thermal break 60, for example a Phaltex® type felt strip 61, can be placed against the central band 22 of each longitudinal rail 21 and held in place by means of a longitudinal plate 62, thereby further reducing any potential heat loss. The retaining plate 62 has slots 63 for the passage of the third fold sections 28 of the associated longitudinal rail 21. It should also be noted that the felt strip 61 is held laterally in place by pairs of studs 29 of material formed on the central band 22 of the metal longitudinal rail 21.

[0077] Finally, [Fig.20] illustrates a thermal insulation device 10 according to the present invention mounted between horizontal uprights 8 of a vertical partition 9, the longitudinal rails 21 of the support structure 20 being in this case mounted horizontally so that the thermal insulation 30 is totally vertical.

[0078] The advantages of the present invention include the following:

[0079] Simplicity: - Only five components: Metal profiles in folded sheet metal 21 - longline securing element 40 - flexible external envelope in the form of a membrane or a canvas 31 - blown thermal insulation - small screws; - Indoor installation, therefore not affected by weather conditions; - Lightweight elements requiring only two installers; and - Rapid and scalable implementation by zone, with very limited and temporary neutralization of walls / roof.

[0080] Lightness: - 5 to 10 kg / m², implementation without calculation verification for buildings prior to 1995, for those after, verification of available calculation notes (DOE for less than 30 years); and - Implementation is facilitated by the lightness of the components.

[0081] Adaptability: - Installation under pitched or flat roofs, and on perimeter walls; - Longitudinal profiles compatible with concrete, wood, metal, etc. framing; - Range of approximately 1.20 to 3.00 m, depending on the needs; - Allows for the preservation of anchor points under and / or against the framework for existing buildings; and - Use in new constructions with the same advantages.

[0082] Performance: - R = 5.2 W / m2 / °C minimum up to R = 8.4 W / m2 / °C, depending on the span for thermal insulation under roof and / or wall; - Acoustic insulation against airborne noise, both indoors and outdoors; - Improved interior acoustics, including a reduction in reverberations; - Flexible outer casing membrane or fabric that is easily cleanable, with a possible fire rating of M0 or M1; and - Lifespan > 20 years.

[0083] It must be clearly understood that the detailed description of the object of the Invention, given solely by way of illustration, does not in any way constitute a limitation, technical equivalents also being included in the scope of the present invention.

[0084] Thus, the metal profiles forming the rails can be made of galvanized steel lacquered in color (all possible colors).

[0085] The flexible outer casing may have a colour or a structured appearance (visible weave pattern for example), to improve the aesthetics of the insulation device.

[0086] More expensive decorative variants can be used for commercial premises, laboratories, offices, multipurpose rooms, sports halls, etc.

[0087] The dimensions indicated are only indicative and may vary, in particular the length of the longitudinal metal profiles and the flexible outer envelopes, the dimensions of the different folds (while retaining the overall shape shown), the thickness of the sheet metal used, the number and / or spacing of the attachment means, the number and / or spacing of the handles, etc.

Claims

Demands

1. Thermal insulation device (10) for a wall envelope (3; 9) or a roof (4) of a building and comprising for this purpose at least one rigid support structure (20) intended to be attached to a load-bearing element (6; 7; 8) of said wall envelope (3; 9) or said roof (4) and thermal insulation (30) carried by said support structure (20), characterized in that: - the thermal insulation (30) comprises at least one flexible outer envelope (31) enclosing an insulating material and provided around its perimeter with at least two prominent opposing attachment members (33), and - the rigid support structure (20) comprises at least two longitudinal profiles (21) in the general form of a rail intended to be fixed to the wall envelope (3;9) or the roof (4) to be insulated, said rails (21) respectively comprising facing attachment means (24) to each receive a longitudinal securing element (40) adapted on the one hand to be inserted removably into the respective opposite attachment members (33) of the flexible outer envelope (31) and on the other hand to cooperate with said attachment means (24) so ​​as to attach said thermal insulation (30) to the rigid support structure (20) following a tensile action exerted on said attachment members (33) by means of said longitudinal securing element (40) in order to make the latter penetrate the attachment means (24) to be held there.;

2. Device (10) according to claim 1, characterized in that the attachment members (33) of the flexible outer casing (31) are constituted by tabs (34) folded back on themselves in the form of a handle and having an opening (35) adapted to receive said longline securing element (40).

3. Device (10) according to claim 2, characterized in that the longline securing element (40) is a straight rod with a constant cross-section, preferably circular, and the opening of each attachment member (33) includes a hollow tube (36) of the same cross-section as the rod (40) in order to receive the latter.

4. Device (10) according to any one of the preceding claims, characterized in that the rigid support structure (20) is constituted by two metal rails (21) intended to be fixed firmly parallel to each other on the wall envelope (3; 9) or the roof (4) of the building to be insulated, each attachment means (24) of a considered rail (21) being made up of different portions of metal (25, 26, 27) folded locally on each other to form a longitudinal channel (G) for receiving said long-lined securing element (40).

5. Device (10) according to claim 4, characterized in that each longitudinal rail (21) is in the form of a central strip (22) provided locally, along at least one of its two opposite longitudinal edges (23), with attachment means (24) each formed by a transverse extension of material (25) extended by a first fold at approximately 90° forming a first portion (26) extended by a second internal fold at approximately 90° forming a second portion (27), so that the transverse extension (25), the first fold and the second fold (37) define a U-shaped chute (G).

6. Device (10) according to claim 5, characterized in that the second fold (27) is extended by a third fold (28) at approximately 90° directed opposite the central band (22) to form a prominent wing in the shape of an "L" erected perpendicular to said central band (22).

7. Device according to claim 6, characterized in that the two longitudinal edges (23) of each metal rail (21) are each provided with hooking means (24) assembled in pairs whose respective U-shaped chutes (G) face each other.

8. Device (10) according to claim 7, characterized in that each metal rail (21) is provided with several pairs of longitudinally extending hooking means (24), a space (24b) measuring at least the width of an attachment member (33) being provided between the channels (G) of two consecutive hooking means (24).

9. Device (10) according to claim 8, characterized in that each flexible outer envelope (31) of a thermal insulator (30) comprises a multitude of attachment members (33) each cooperating with a space (24b) between chutes (G).

10. Device according to any one of the preceding claims, characterized in that the longitudinal rail (21) is covered with a thermal break (60), such as a felt strip (61).

11. Device according to the preceding claim, characterized in that the thermal break (60) is a felt strip (61) covered with a sheet (62) and held laterally in place by pairs of material studs (29) provided on the longitudinal rail (21).

12. Device according to any one of the preceding claims, characterized in that said thermal insulating material is of the blown type and the flexible outer envelope (31) is a flexible membrane or fabric, preferably plasticized to be easily cleaned and fire-resistant of class MO or Ml, the whole taking substantially the form of a parallelepiped-shaped cushion.

13. A method for thermal insulation for a building wall (3; 9) or roof (4), using the thermal insulation device (10) according to any one of the preceding claims and consisting of: - firmly fixing at least two longitudinal profiles (21) opposite each other on the wall or roof envelope to be insulated, - inserting a first longitudinal securing element (40) into a first fastening member (33) of the flexible outer envelope (31), - inserting the first longitudinal securing element (40) into the corresponding attachment means (24) of a first longitudinal profile (21), - inserting a second longitudinal securing element (40) into a second fastening member (33) of the flexible outer envelope (31) opposite the first fastening member (33),- exert a tensile force (F) on the second longitudinal securing element (40) substantially perpendicular to its elongation direction in order to make it penetrate a fastening means (24) of the second longitudinal profile (21) by pulling on the fastening members (33) of the flexible outer casing (31), and - release the tensile force exerted on the second longitudinal securing element (40) once the latter is correctly positioned and locked in the fastening means (24) of the second longitudinal profile (21).