An apparatus for retaining insulation boards

Abstract

An apparatus 1 for retaining insulation boards comprising an elongate body having at least a first wall 3 and a second wall 4, the second wall comprising a proximal end and a distal end, wherein the f

Description

Technical Field of the Invention The present invention relates to methods and apparatus for retaining insulation boards. Background to the Invention In recent years, building regulations have become more stringent in a bid to improve the energy efficiency of existing and newly built properties. This has the obvious benefit of reducing the cost of heating properties as well helping to reduce CO2 emissions. One common method of improving energy efficiency is to provide improved insulation in properties. The use of insulation boards such as surface board backed with rigid insulation or foil faced material is well known in the construction industry to minimise heat loss from both domestic and commercial properties. Insulation boards are commonly fitted in the gaps between beams or joists which provide the construction frame for roofs, walls, and flooring. Each board is usually cut to a size where it may be friction fitted by pushing it between the beams or joists and is often held in place by additional fixing methods such as nails, screws, wooden battens or spray foam. It is preferable to subsequently seal the joint between the insulation board and the joist or beam to minimise the flow of air therethrough. GB2525048B discloses an apparatus for retaining insulation boards comprising an elongate body having a first wall and a pair of opposing second walls. Each second wall comprises a proximal end and a distal end. The first wall is provided at the proximal end of each second wall and extends perpendicular to each second wall. The distal end of each second wall comprises a ledge extending perpendicular to the second wall configured to support the insulation board. Each second wall further comprises a flap which extends away from the second wall. In use, the apparatus of GB2525048B may be seated on a beam or joist and secured thereto. A second apparatus may be seated on an adjacent beam or joist, and an insulation board may be cut to size such that the board fits in the gap between the beams or joists. The insulation board may be installed by application of a downward force which causes the flaps to be compressed towards the second wall, thereby securing the insulation board in place. Once a lower surface of the insulation board has contacted the ledge, the application of the downward force may be removed. Utilising the apparatus of GB2525048B may assist in the rapid and precise installation of insulation boarding, capable of reducing the time taken to install insulation boards by up to four times. Despite the significant benefits of using the apparatus of GB2525048B, the resulting product has struggled to gain much traction in the market. One issue with installation of insulation boards using the apparatus of GB2525048B is cold bridging. Cold bridges may occur where there is a gap in the insulation, for example, in use the first wall of the apparatus is in direct contact with the beam or joist and there is no layer of insulation provided in this area. The thermal conductivity of such an area is significantly greater than the surrounding insulated areas. Consequently, a greater proportion of heat is dissipated through the cold bridge compared to the surrounding areai e., the second walls having insulation board adjacent thereto. The cold bridge is at a much lower temperature, causing a temperature difference between the insulated and non-insulated zones. Such a temperature difference is liable to cause formation of condensation in the non-insulated zones. This can lead to further issues such as growth of mould and the presence of damp. To address this, in practice, the apparatus manufactured according to GB2525048B has been altered to include cut-outs in the first wall, to allow condensation to evaporate. Moreover, installers should apply additional insulation over the first wall, to close the gap in the insulation and avoid the formation of a cold bridge. This can be done by applying a layer of additional insulation boards over the insulation boards and the top of the first wall. Obviously, application of additional insulation boards on top of the boards that extend between the beams or joists is not ideal as it takes up additional space as well as requiring additional material and additional time to apply the additional boards (thus increasing costs of both labour and material). Furthermore, during installation of insulation boards using the apparatus of GB2525048B, it is not unusual for the installer to have to replace or refit boards. The installer may also have to readjust the boards to account for movement occurring during installation as a result of the boards not being retained securely enough. In such circumstances, edges of the insulation boards are liable to suffer damage and breakage as a result of readjustment, because the edges of the flaps can cut into and break off the comer of the boards, thereby wasting materials if the boards can no longer be used. Embodiments of the present invention seek to overcome these or other disadvantages and / or to provide an improved retaining apparatus for insulation boards. Summary of the Invention According to a first aspect of the present invention there is provided an apparatus for retaining insulation boards comprising: an elongate body having at least a first wall and a second wall, the second wall comprising a proximal end and a distal end; wherein the first wall is provided at the proximal end of the second wall and extends perpendicular to the second wall; and wherein the second wall further comprises a flap extending away from the second wall, the flap having a fixed end and a free end, and a lip extending from the free end of the flap. Provision of such an apparatus is particularly advantageous for assisting in retaining insulation boards. During installation, the insulation board may be fitted into place by applying a downward force on the board such that an edge of the insulation board compresses the flap, deforming it towards the second wall, causing the lip to “bite” into and securely hold the insulation board in position. The lip may provide a leading edge to securely hold the insulation board and potentially prevent the bottom of the board breaking off. The flap of GB2525048B extends at an angle but does not comprise a lip. As such, when the insulation board is installed, the edge of the flap may not compress fully and instead, may cut through the lower edge of the board at an angle. However, the apparatus of the first aspect comprises a lip which may assist in preventing this occurring as instead of cutting through the board diagonally, the lip may grip the edge of the board, thereby minimising the risk of the flap cutting through the lower edge causing the board to break. Furthermore, the secure retention of the board as a result of the lip means that the board is held securely and is less likely to have to be removed and readjusted to obtain a strong hold. As removal and readjustment can often cause damage to the board, minimising the frequency that this is required may help to minimise the number of boards breaking and therefore wasted. Furthermore, the provision of such a lip which may increase the strength of the grip on the insulation board is particularly advantageous when used in flooring. For example, the improved apparatus may used in the flooring of static caravans or similar prefabricated buildings. Such static caravans are often transported long distances on trailers, and during this time they are exposed to updrafts. As there is often no layer provided beneath the insulation during transportation, failure to securely hold the insulation boards in place may result in the boards being blown out of position and destroyed. However, the present invention may minimise the risk of this occurring. In use, static caravans are placed on the ground, often on a concrete foundation. Where they may be vulnerable to flooding. In particular, rising water levels may result in debris and / or components of the static caravan itself becoming dislodged and applying an upward force on the base of the caravan. In such instances, provision of a lip according to the present invention, which securely retains insulation boards is particularly advantageous as it may assist in minimising the risk of the insulation boards becoming dislodged and therefore causing further damage to surrounding component such as the floor above. In addition, although manufacturers explicitly indicate that insulation boards should not be loaded e.g., with the weight of a person, during installation of insulation, installers may inadvertently step on such boards which may result in the board becoming dislodged and falling through. However, provision of the lip of the claimed invention holds the insulation board in place more strongly so that in such an event, it is less likely that the board will become dislodged, and subsequently damaged beyond useability. Naturally, the claimed invention does not change the advice and installers should always heed the board manufacturer’s instructions. However, it is advantageous in the ‘real world’ where, whether deliberately or inadvertently, these instructions may not be observed. The second wall may comprise a ledge. The ledge may be provided at the distal end of the second wall. Alternatively, the ledge may be provided at a point between the proximal end of the second wall and the distal end of the second wall. By providing the ledge at a point between the proximal and distal ends of the second wall, the apparatus may easily be adapted to accommodate changes in regulation depths of insulation as well as being readily adapted to for use on a wide variety of depths of beam. The ledge may extend perpendicular to the second wall. The ledge may extend in the opposite direction to the first wall. The ledge may be configured to support the insulation board. Provision of a ledge is particularly advantageous as during installation, the insulation board may be pushed downwards until a lower surface of the board contacts and is retained in place by the ledge. The flap may extend away from the second wall toward the ledge. The flap may extend away from the second wall at an angle of at least 10°, more preferably of at least 20°, or most preferably of at least 30°. The flap may extend away from the second wall at a maximum angle of 90°, more preferably at a maximum angle of 70°, or most preferably at a maximum angle of 50°. The flap may extend away from the second wall at an angle in the range of 10°-90°. The flap may extend away from the second wall at an angle in the range of 20°-70°. The flap may extend away from the second wall at an angle in the range of 30°-50°. The flap (i.e., the fixed end of the flap) may be provided at the distal end of the second wall. Alternatively, the flap may be provided at a distance of at least 1 cm from the distal end of the second wall, more preferably at a distance of at least 1.5 cm from the distal end of the second wall, or most preferably at a distance of at least 3 cm from the distal end of the second wall. The flap may be provided at a maximum distance of 10 cm from the distal end of the second wall, more preferably at a maximum distance of 7 cm from the distal end of the second wall, or most preferably at a maximum distance of 4 cm from the distal end of the second wall. The flap may be provided at a distance in the range of 1 cm-10 cm from the distal end of the second wall. The flap may be provided at a distance in the range of 1.5 cm-7 cm from the distal end of the second wall. The flap may be provided at a distance in the range of 3 cm-4 cm from the distal end of the second wall. The flap may have a linear profile. Preferably, the flap may have a curved profile. A curved profile may assist in improving the strength with which the insulation boarding may be secured. The flap may curve away from the second wall. The flap may curve away from the second wall with a substantially constant curvature i.e. the radius of curvature remains constant. There may be a plane extending between the fixed end and the free end of the flap. The flap may curve away from the plane extending between the fixed end and the free end of the flap by a maximum distance of at least 1 mm, more preferably of at least 1.5 mm, or most preferably of at least 2.5 mm. The flap may curve away from the plane extending between the fixed end and the free end of the flap by a maximum distance no greater than 5 mm, more preferably no greater than 4.5 mm, most preferably no greater than 3.5 mm. The flap may curve away from the plane extending between the fixed end and the free end of the flap by a maximum distance in the range of 1 mm-5 mmm. The flap may curve away from the plane extending between the fixed end and the free end of the flap by a maximum distance in the range of 1.5 mm- 4.5 mm. The flap may curve away from the plane extending between the fixed end and the free end of the flap by a maximum distance in the range of 2.5 mm-3.5 mm. The flap may have a length (i.e., the distance between the fixed end and the free end of the flap) of at least 1 cm, more preferably the flap may have a length of at least 1.25 cm, or most preferably the flap may have a length of at least 1.5 cm. The flap may have a maximum length of 4 cm, more preferably, the flap may have a maximum length of 3 cm, or most preferably the flap may have a maximum length of 2.5 cm. The flap may have a length in the range of 1 cm-4 cm. The flap may have a length in the range of 1.25 cm-3 cm. The flap may have a length in the range of 1.5 cm-2.5 cm. The flap may extend along a portion of the elongate body. Preferably, the flap may extend along the entire length of the elongate body. The flap may extend along a portion of the second wall. Preferably, the flap may extend along the entire length of the second wall. Providing the flap along the entire length of the elongate body and / or the second wall may assist in securing the insulation board with the same strength along the entire length. Furthermore, the elongate body may be cut to size without affecting the useability of the body. The flap may be resilient. The flap may be configured to deform into a compressed position. The flap may be configured to resiliently deform into a compressed position The flap may be configured to deform into a compressed position wherein the flap is substantially parallel to the second wall i .e., the curved profile of the flap may straighten until it is substantially linear. Provision of such a flap may encourage secure retention of the insulation board as a result of the reaction force exerted on the insulation board by the flap. The flap may be integrally formed with the elongate body. The flap may be reinforced about the fixed end of the flap. For example, additional material may be provided at the fixed end of the flap. The flap may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. The flap may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, the flap may have a thickness of 1 mm. The flap may have a thickness in the range of 0.25 mm-2.5 mm. The flap may have a thickness in the range of 0.5 mm-2 mm. The flap may have a thickness in the range of 0.75 mm-1.5 mm. Provision of a flap having a thickness within the abovementioned ranges is particularly advantageous as it allows the flap to be of sufficient strength to deform in use without breaking and / or snapping off. The lip may extend away from the ledge. The lip may extend away from the flap. The lip may extend away from the flap (i.e. the lip may extend away from the plane extending between the fixed end and the free end of the flap) at an angle of at least 45°, more preferably of at least 65°, or most preferably of at least 85°. The lip may extend away from the flap at an angle no greater than 105°, more preferably at an angle no greater than 100°, or most preferably, at an angle no greater than 95°. Preferably the lip may extend away from the flap at an angle of 90°. The lip may extend away from the flap at an angle in the range of 45°-105°. The lip may extend away from the flap at an angle in the range of 65°-100°. The lip may extend away from the flap at an angle in the range of 85°-95°. Provision of a lip which extends away from the flap at an angle in the abovementioned ranges may assist in improving the strength with which the lip may grip the insulation board during use. The lip may extend away from the flap (i.e., the lip may extend away from the plane extending between the fixed end and the free end of the flap) at a constant angle with respect to the plane extending between the fixed end and the free end of the flap i.e. the angle of the lip with respect to the flap may remain constant regardless of the position of the flap. The lip may extend away from the flap at an angle of at least 45°, more preferably of at least 65°, or most preferably of at least 85° when the flap is in the compressed position. The lip may extend away from the flap at an angle no greater than 105°, more preferably at an angle no greater than 100°, or most preferably, at an angle no greater than 95° when the flap is in the compressed position. Preferably the lip may extend away from the flap at an angle of 90° when the flap is in the compressed position. The lip may extend away from the flap at an angle in the range of 45°-105° when the flap is in the compressed position. The lip may extend away from the flap at an angle in the range of 65°-100° when the flap is in the compressed position. The lip may extend away from the flap at an angle in the range of 85°-95° when the flap is in the compressed position. Provision of a lip which extends away from the flap at substantially the same angle in the in use compressed position, and the unused position is advantageous as it means that in the compressed position, whilst the curved profile of the flap may straighten until it is substantially linear, the angle of the lip with respect to the plane extending between the fixed end and the free end of the flap remains substantially constant. Therefore, the lip remains rigid in its position relative to the flap, assisting in providing a secure grip of the edge of the insulation board. The lip may comprise a fixed end and a free end. The lip may have a length (i.e., the distance between the fixed end and the free end of the lip) of at least 0.1 cm, more preferably of at least 0.15 cm, or most preferably of at least 0.3 cm. The lip may have a maximum length of 1.5 cm, more preferably a maximum length of 1 cm, or most preferably a maximum length of 0.7 cm. The lip may have a length in the range of 0.1 cm-1.5 cm. The lip may have a length in the range of 0.15 cm-1 cm. The lip may have a length in the range of 0.3 cm-0.7 cm. Provision of a lip having a length falling within the abovementioned values may allow the lip to grip and “bite” into an edge of the insulation board without cutting too far into the board which may result in the lower comer of the board breaking off, thereby resulting in a gap in the insulation or a weaker attachment between the insulation board and the apparatus. The lip may comprise an edge at its free end. The edge may assist in engaging the edge of the insulation board in use, effectively “cutting” into the board without causing unnecessary damage and crumbling of the edges of the board. The lip may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. The lip may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, the lip may have a thickness of 1 mm. The lip may have a thickness in the range of 0.25 mm-2.5 mm. The lip may have a thickness in the range of 0.5 mm-2 mm. The lip may have a thickness in the range of 0.75 mm-1.5 mm. The ledge may be integrally formed with the elongate body. . The ledge may extend from the second wall at a joint. The joint may be sharp. Preferably, the joint may be curved. Provision of a curved joint may improve ease of manufacture and distribute the stress placed on the joint. The ledge may be reinforced about the joint. For example, additional material may be provided at the joint. The ledge may have a width (i .e., protrude from the distal end of the second wall for a distance) of at least 0.5 cm, more preferably of at least 1 cm or most preferably of at least 1 5 cm. The ledge may have a maximum width of 4.5 cm, more preferably a maximum length of 3.5 cm, or most preferably a maximum width of at least 2.5 cm. The ledge may have a width in the range of 0.5 cm-4.5 cm. The ledge may have a width in the range of 1 cm-3.5 cm. The ledge may have a width in the range of 1.5 cm-2.5 cm. Provision of a ledge having a width within the abovementioned values may be particularly beneficial in providing a surface having sufficient depth to support the insulation board in use without being overly long such that the overall weight of the elongate body is unnecessarily increased. The ledge may extend along a portion of the elongate body. Preferably, the ledge may extend along the entire length of the elongate body. The ledge may extend along a portion of the second wall. Preferably, the ledge may extend along the entire length of the second wall. Providing the ledge along the entire length of the elongate body and / or the second wall may assist in securing the insulation board with the same strength along the entire length. Furthermore, provision of such a ledge is particularly advantageous in providing a level surface for the insulation board to contact. This may assist in allowing an additional level surface such as plasterboard and / or flooring to be installed below and / or above the insulation board. The elongate body may also be cut to size without affecting the useability of the body i.e., regardless of where the elongate body is cut, there will be a ledge provided. The ledge may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. The ledge may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, the ledge may have a thickness of 1 mm. The ledge may have a thickness in the range of 0.25 mm-2.5 mm. The ledge may have a thickness in the range of 0.5 mm-2 mm. The ledge may have a thickness in the range of 0.75 mm-1.5 mm. The elongate body may be shaped to conform to a beam or a joist. The elongate main body may be shaped to conform to a construction frame. The elongate main body may be shaped to conform to the construction frame of a roof or a floor or a wall. In other words, the approximate 90° angle provided between the first wall and the second wall enables the elongate main body to be seated onto a corresponding approximate 90° angle of a beam or a joist or a construction frame. The elongate body may be secured to the beam or a joist or a construction frame using screws or nails. The elongate body may have a length of at least 0.5 m, more preferably of at least Im, or most preferably of 1.5 m. The elongate body may have a length no greater than 4.5 m, more preferably no greater than 4 m, or most preferably no greater than 3.5 m. The elongate body may have a length in the range of 0.5 m-4.5 m. The elongate body may have a length in the range of 1 m-4 m. The elongate body may have a length in the range of 1.5-3.5 m. The elongate body may, in use, be cut to size. This is particularly advantageous as beams and joists and construction frames may come in a variety of lengths. As such, being able to cut a single elongate body to a bespoke length enables the body to be tailored during use, thereby minimising the amount of wasted material. Furthermore, shorter offcuts of the elongate body may be combined together, effectively increasing the length of elongate body provided. The elongate body may be formed from a polymer. The elongate body may be formed from a plastic. The elongate body may be formed from uPVC. Forming the elongate body from uPVC is particularly advantageous as the material is capable of retaining the insulation board as well as being attached to the beam or joist or construction frame e.g., using screws, without breaking. Furthermore, uPVC may easily be extruded during the manufacturing process. The elongate body may be formed as a single piece. The elongate body may be formed via extrusion. The elongate body may be formed via moulding. The elongate body may be formed via injection moulding. The first wall may be a solid wall. The second wall may be a solid wall. Alternatively, the first wall or the second wall may comprise a series of apertures. The apertures may be rectangular, “L-shaped”, circular, “zig-zagged” or any other suitable shape. Provision of such apertures is particularly advantageous in the first wall in promoting airflow and helping to prevent entrapment of moisture caused by the temperature difference arising due to the provision of an insulation board adjacent to the second wall but not adjacent to the first wall. Trapped moisture is likely to encourage damp and mould formation which can affect the structural integrity of the beam or joist or construction frame. Furthermore, the presence of damp and mould may result in adverse health effects such as allergic responses and / or asthma. The first wall may have a width of at least 2 cm, more preferably of at least 3 cm, or most preferably of at least 4 cm. The first wall may have a width of no more than 15 cm, more preferably of no more than 12.5 cm, or most preferably of no more than 10 cm. The first wall may have a width in the range of 2 cm- 15 cm. The first wall may have a width in the range of 3 cm- 12.5 cm. The first wall may have a width in the range of 4 cm- 10 cm. The first wall may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. The first wall may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, the first wall may have a thickness of 1 mm. The first wall may have a thickness in the range of 0.25 mm-2.5 mm. The first wall may have a thickness in the range of 0.5 mm-2 mm. The first wall may have a thickness in the range of 0.75 mm-1.5 mm. The second wall may have a height of at least 5 cm, more preferably of at least 7.5 cm, or most preferably of at least 10 cm. The second wall may have a height of no more than 25 cm, more preferably of no more than 20 cm, or most preferably of no more than 15 cm. The second wall may have a height (i.e., the distance from the proximal end to the distal end of the second wall) in the range of 5 cm-25 cm. The second wall may have a height in the range of 7.5 cm-20 cm. The second wall may have a height in the range of 10 cm-15 cm. Provision of a second wall having a height within the abovementioned range of values may allow the elongate body to be seated on a variety of different beams or joists or construction frames to whilst allowing a regulatory depth of insulating material to be provided adjacent to the beam regardless of the depth of the beam. The second wall may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. The second wall may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, the second wall may have a thickness of 1 mm. The second wall may have a thickness in the range of 0.25 mm-2.5 mm. The second wall may have a thickness in the range of 0.5 mm-2 mm. The second wall may have a thickness in the range of 0.75 mm-1.5 mm. The elongate body may comprise a pair of second walls. The elongate body may comprise a pair of opposing second walls. The first wall and the pair of opposing second walls may form a substantially “U” shaped cross-section. Provision of such an elongate body allows a single body to be fitted to the beam and secured e.g., using nails or screws on either side of the beam as opposed to securing two elongate bodies to either side of the beam. This is particularly advantageous for use on a central beam or joist or on a central portion of the construction frame as the elongate body is essentially “hooked” in position, such that a user may more easily and efficiently attach the elongate body using screws and / or nails. The first wall may comprise a score line. The score line may be provided along the centre of the width of the first wall. The score line may be provided along the entire length of the first wall. The score line may enable the elongate body to be divided into two corresponding halves. The elongate body may be symmetric about the plane of the score line. This is advantageous as it allows the elongate body to be adapted to fit beams or joists or construction frames which would otherwise be too wide for the elongate body to be seated comfortably thereon. Preferably, the elongate body may comprise a pair of substantially parallel opposing second walls. Preferably each second wall may comprise a proximal end and a distal end. Preferably the proximal ends of each second wall may be connected to the first wall. Preferably the first wall may comprise a first face and an opposing second face. Preferably the second face may be enclosed by the pair of opposing second walls. Preferably a layer of insulating material may be provided between the pair of second walls adjacent to the second face of the first wall, or the apparatus may comprise means for attaching a layer of insulating material between the pair of second walls adjacent to the second face of the first wall. Preferably, the elongate body may comprise a pair of opposing second walls wherein each second wall comprises a proximal end and a distal end, and the proximal ends of each second wall are connected to the first wall; and wherein the first wall has a first face and an opposing second face; the second face being enclosed by the pair of opposing second walls, and wherein a layer of insulating material is provided between the pair of second walls adjacent to the second face of the first wall or the apparatus comprises means for attaching a layer of insulating material between the pair of second walls adjacent to the second face of the first wall. According to a second aspect of the present invention there is provided an apparatus for retaining insulation boards comprising: an elongate body having at least a first wall and a pair of substantially parallel opposing second walls, wherein each second wall comprises a proximal end and a distal end, and the proximal ends of each second wall are connected to the first wall; and wherein the first wall has a first face and an opposing second face; the second face being enclosed by the pair of opposing second walls, and wherein a layer of insulating material is provided between the pair of second walls adjacent to the second face of the first wall or the apparatus comprises means for attaching a layer of insulating material between the pair of second walls adjacent to the second face of the first wall. Provision of such an apparatus is particularly advantageous as it may assist in minimising the effects of “cold bridging”, such as formation of condensation, without the need for manufacturers to apply a separate layer of insulation as disclosed above. Provision of an apparatus according to the second aspect is particularly advantageous in helping to minimise the effects of cold bridging as the layer of insulating material may eliminate the presence of gaps in the insulation where such cold bridges may form. Therefore, the solution provided by the apparatus of the second aspect eliminates the source of the condensation problem i.e., in use, the apparatus is seated on a beam or joist and not only are insulation boards are provided adjacent to the pair of opposing second walls, but a layer of insulating material is provided adjacent to the second face of the first wall and an upper surface of the beam. As such, the layer of insulating material and the provision of insulation boards are positioned in such a way as to assist in minimising the presence of gaps in the insulation where cold bridges may form. Therefore, the source of the problem i.e., the formation of cold bridges may be removed as opposed to mitigating the effects i.e., formation of condensation. This solution can be more effective than applying a further layer of insulation over the first wall and boards and is also easier as the step of applying such (e.g., fiberglass) insulation is avoided; is more efficient because the insulation is focused where it is needed (i.e., between and on top of the boards), and avoids wastage of space. Each of the second walls may comprise a ledge. Each of the second walls may comprise a ledge at the distal end of the second wall. Alternatively, the ledge may be provided at a point between the proximal end of the second wall and the distal end of each second wall. By providing the ledge at a point between the proximal and distal ends of the second wall, the apparatus may easily be adapted to accommodate changes in regulation depths of insulation as well as being readily adapted to for use on a wide variety of depths of beam. The ledge may extend perpendicular to each second wall. Each ledge may extend in the opposite direction to the first wall. Each ledge may be configured to support the insulation board. Provision of a ledge is particularly advantageous as during installation, the insulation board may be pushed downwards until a lower surface of the board contacts and is retained in place by the ledge. The layer of insulating material may be formed from polystyrene. Preferably, the layer of insulating material may be formed from extruded polystyrene (XPS). Forming the layer of insulating material from XPS is particularly advantageous as it may have a compressive strength capable of withstanding applied loads such as the installation of the insulation board, may be easily cut to size, and may meet the thermal requirements such as having a low thermal conductivity to minimise the loss of heat therethrough. Alternatively, the layer of insulating material may be formed from PIR. The layer of insulating material may extend fully between the pair of opposing second walls. The layer of insulating material may be provided adjacent to the second face of the first wall. The layer of insulating material may be provided directly adjacent to (i.e., in contact with) the second face of the first wall. Preferably, the layer of insulating material may be adjacent to (most preferably directly adjacent to) each of the pair of opposing second walls and the second face of the first wall. Providing the layer of insulating material in such a configuration may be particularly beneficial in minimising the presence of gaps in the insulation which may encourage the formation of cold bridges. The layer of insulating material may have a thickness of at least 1 cm, more preferably of at least 1.5 cm, or most preferably of 3 cm. The layer of insulating material may have a maximum thickness of 10 cm, more preferably of 7 cm, or most preferably of 4 cm. The layer of insulating material may have a thickness in the range of 1 cm-10 cm. The layer of insulating material may have a thickness in the range of 1.5 cm-7 cm. The layer of insulating material may have a thickness in the range of 3 cm-4 cm. Provision of a layer of insulating material having a thickness in the abovementioned range is particularly advantageous as it increases the effective height of the beam or joist or construction frame upon which it is provided. In this way, the pair of second walls may be positioned such that they do not overhang the beam or joist or construction frame in order to allow insulation boards of regulation thickness (e.g, 150 mm thick) to be installed either side of the beam or joist or construction frame in instances where said beam or joist or construction frame have a height less than the height of the each of the second walls (e.g. 100-120 mm). The layer of insulating material may extend over a portion of the length of the elongate body. Preferably, the layer of insulating material may extend the entire length of the elongate body. The layer of insulating material may have a substantially cuboidal form. The layer of insulating material may have a substantially elongate cuboidal form. The layer of insulating material may have a shape conforming to that of the pair of opposing second walls and the second face of the first wall. The layer of insulating material may be attached to the second face of the first wall. The layer of insulating material may be adhered to the second face of the first wall. Adhering the layer of insulating material to the second face of the first wall is particularly advantageous as during manufacture, a single layer of adhesive must be applied to the second face of the first wall as opposed to applying adhesive to the internal faces of the pair of second walls. This improves ease of installation as the layer of insulating material may be easily inserted without risk of adhering to the pair of opposing second walls. Furthermore, in use, the pair of second walls may be compressed against the sides of the layer of insulating material as a result of installation of the insulation board such that the gap therebetween may be eliminated. This may assist in minimising the throughflow of air which may encourage the dissipation of heat. Where the apparatus comprises means for attaching a layer of insulating material between the pair of second walls adjacent to the second face of the first wall, the means for attaching the layer of insulating material may be provided on the second face of the first wall. Provision of the means on the first wall may allow the insulating material to be simply pushed into the channel formed between the second walls into contact with the means for attachment in order to attach the insulating material. This may provide for easier attachment than provision of the means for attachment on one or each of the second walls. The means for attaching the layer of insulating material may comprise a mechanical fastener or an adhesive means. The adhesive means may comprise for example a double-sided adhesive tape, which may have a removable release liner to reveal the adhesive to attach to the insulating material. The mechanical faster may comprise for example at least one barb. The at least one barb may project from the second face of the first wall. The at least one barb may extend the entire length of the first wall. Alternatively, a plurality of barbs may be provided along the length of the first wall. The at least one barb may comprise a main body. The main body may be straight. The main body may be perpendicular to the first wall. The main body may comprise a free end. Provision of at least one barb is particularly advantageous in allowing the layer of insulating material to be fitted retrospectively. This enables installers to cut the layer of insulating material to the correct depth on site before installing. As such, variations in the height of the beam or joist or construction frame may be accommodated for. For example, if one beam or joist has a smaller depth than an adjacent beam, the depth of the layer of insulating material may be cut larger than that of the layer of insulating material attached to the beam having a larger depth. This enables the installer to provide a level surface for the insulation boards to contact. The at least one barb may comprise a projection. The projection may comprise a first end and a second end. The first end may be attached to the free end of the main body. The projection may extend away from the main body towards the second face of the first wall. The projection may comprise a straight or curved profile. A plane of the projection may extend from the first end to the second end. Provision of such a projection may assist in securely gripping the layer of insulating material once installed by helping to prevent the layer of insulating material detach from the barb once attached. The plane of the projection may extend away from the main body of the at least one barb at an angle of at least 20°, more preferably of at least 30°, or most preferably of at least 40°. The plane of the projection may extend away from main body of the at least one barb at an angle of no more than 70°, more preferably no more than 60°, or most preferably of no more than 50°. The plane of the projection may extend away from the main body of the at least one barb at an angle in the range of 20°-70°. The plane of the projection may extend away from the at least one barb at an angle in the range of 30°-60°. The plane of the projection may extend away from the at least one barb at an angle in the range of 40°-50°. Provision of a projection whose plane extends away from the at least one barb by an angle within the abovementioned ranges is particularly advantageous in creating a “hooking effect” with which to retain the layer of insulating material. Each ledge may be integrally formed with the elongate body. Each ledge may extend from the second wall at a joint. The joint may be sharp. Preferably, the joint may be curved. Provision of a curved joint may improve ease of manufacture and distribute the stress placed on the joint. Each ledge may be reinforced about the joint. For example, additional material may be provided at the joint. Each ledge may have a width (i.e., protrude from the distal end of the second wall for a distance) of at least 0.5 cm, more preferably of at least 1 cm or most preferably of at least 1.5 cm. Each ledge may have a maximum width of 4.5 cm, more preferably a maximum length of 3.5 cm, or most preferably a maximum width of at least 2.5 cm. Each ledge may have a width in the range of 0.5 cm-4.5 cm. The ledge may have a width in the range of 1 cm-3.5 cm. Each ledge may have a width in the range of 1.5 cm-2.5 cm. Provision of a ledge having a width within the abovementioned values may be particularly beneficial in providing a surface having sufficient depth to support the insulation board in use without being overly long such that the overall weight of the elongate body is unnecessarily increased. Each ledge may extend along a portion of the elongate body. Preferably, each ledge may extend along the entire length of the elongate body. Each ledge may extend along a portion of the second wall. Preferably, each ledge may extend along the entire length of the second wall. Providing each ledge along the entire length of the elongate body and / or the second wall may assist in securing the insulation board with the same strength along the entire length. Furthermore, provision of such a ledge is particularly advantageous in providing a level surface for the insulation board to contact. This may assist in allowing an additional level surface such as plasterboard and / or flooring to be installed below and / or above the insulation board. The elongate body may also be cut to size without affecting the useability of the body i.e., regardless of where the elongate body is cut, there will be a ledge provided. Each ledge may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. Each ledge may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, each ledge may have a thickness of 1 mm. Each ledge may have a thickness in the range of 0.25 mm-2.5 mm. Each ledge may have a thickness in the range of 0.5 mm-2 mm. Each ledge may have a thickness in the range of 0.75 mm-1.5 mm. The elongate body may be shaped to conform to a beam or a joist. The elongate main body may be shaped to conform to a construction frame. The elongate main body may be shaped to conform to the construction frame of a roof or a floor or a wall. In other words, the approximate 90° angles provided between the first wall and the pair of opposing second walls enables the elongate main body to be seated onto a corresponding approximate 90° angles of a beam or a joist or a construction frame edge. The elongate body may be secured to the beam or a joist or a construction frame using screws or nails. The elongate body may have a length of at least 0.5 m, more preferably of at least Im, or most preferably of 1.5 m. The elongate body may have a length no greater than 4.5 m, more preferably no greater than 4 m, or most preferably no greater than 3.5 m. The elongate body may have a length in the range of 0.5 m-4.5 m. The elongate body may have a length in the range of 1 m-4 m. The elongate body may have a length in the range of 1.5-3.5 m. The elongate body may, in use, be cut to size. This is particularly advantageous as beams and joists and construction frames may come in a variety of lengths. As such, being able to cut a single elongate body to a bespoke length enables the body to be tailored during use, thereby minimising the amount of wasted material. Furthermore, shorter offcuts of the elongate body may be combined together, effectively increasing the length of elongate body provided. The elongate body may be formed from a polymer. The elongate body may be formed from a plastic. The elongate body may be formed from uPVC. Forming the elongate body from uPVC is particularly advantageous as the material is capable of retaining the insulation board as well as being attached to the beam or joist or construction frame e.g., using screws, without breaking. Furthermore, uPVC may easily be extruded during the manufacturing process. The elongate body may be formed as a single piece. The elongate body may be formed via extrusion. The elongate body may be formed via moulding. The elongate body may be formed via injection moulding. The first wall may have a width of at least 2 cm, more preferably of at least 3 cm, or most preferably of at least 4 cm. The first wall may have a width of no more than 15 cm, more preferably of no more than 12.5 cm, or most preferably of no more than 10 cm. The first wall may have a width in the range of 2 cm- 15 cm. The first wall may have a width in the range of 3 cm- 12.5 cm. The first wall may have a width in the range of 4 cm- 10 cm. The first wall may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. The first wall may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, the first wall may have a thickness of 1 mm. The first wall may have a thickness in the range of 0.25 mm-2.5 mm. The first wall may have a thickness in the range of 0.5 mm-2 mm. The first wall may have a thickness in the range of 0.75 mm-1.5 mm. The pair of opposing second walls may have a height of at least 5 cm, more preferably of at least 7.5 cm, or most preferably of at least 10 cm. The pair of opposing second walls may have a height of no more than 25 cm, more preferably of no more than 20 cm, or most preferably of no more than 15 cm. The pair of opposing second walls may have a height (i.e., the distance from the proximal end to the distal end of the second wall) in the range of 5 cm-25 cm. The pair of opposing second walls may have a height in the range of 7.5 cm-20 cm. The pair of opposing second walls may have a height in the range of 10 cm-15 cm. Provision of a pair of opposing second walls having a height within the abovementioned range of values may allow the elongate body to be seated on a variety of different beams or joists or construction frames to whilst allowing a regulatory depth of insulating material to be provided regardless of the depth of the beam. The pair of opposing second walls may have a thickness of at least 0.25 mm, more preferably a thickness of at least 0.5 mm, or most preferably a thickness of at least 0.75 mm. The pair of opposing second walls may have a thickness no greater than 2.5 mm, more preferably no greater than 2 mm, or most preferably no greater than 1.5 mm. Preferably, the pair of opposing second walls may have a thickness of 1 mm. The second wall may have a thickness in the range of 0.25 mm-2.5 mm. The pair of opposing second walls may have a thickness in the range of 0.5 mm-2 mm. The pair of opposing second walls may have a thickness in the range of 0.75 mm-1.5 mm. The first wall may comprise a score line. The score line may be provided along the centre of the width of the first wall. The score line may be provided along the entire length of the first wall. The score line may enable the elongate body to be divided into two corresponding halves. The elongate body may be symmetric about the plane of the score line. This is advantageous as it allows the elongate body to be adapted to fit beams or joists or construction frames which would otherwise be too wide for the elongate body to be seated comfortably thereon and / or beams or joists which are provided in locations difficult to access such at edge beams which only have one side accessible. The invention of the second aspect of the invention may optionally include any of the features of the invention of the first aspect, optionally including any optional features thereof. According to a third aspect of the present invention there is provided a method of installing at least one insulation board comprising the steps of: (a) providing the apparatus of the first aspect of the present invention; (b) seating the apparatus of the first aspect of the invention on a beam or joist or construction frame; (c) attaching the apparatus of the first aspect of the invention to the beam or joist or construction frame (for example, using screws or nails); and (d) installing an insulation board using the apparatus of the first aspect of the present invention. Step (d) may comprise aligning the edge of the insulation board with the second wall. Step (d) may applying a force to the insulation board in the direction of the ledge. Step (d) may comprise applying the force to the insulation board in the direction of the ledge such that the lip engages the edge of the insulation board. Step (d) may comprise compressing the flap towards the second wall. Step (d) may comprise applying the force to the insulation board in the direction of the ledge until a lower surface of the board contacts the ledge. According to a fourth aspect of the present invention there is provided a method of installing at least one insulation board comprising the steps of: (a) providing the apparatus of the second aspect of the invention; (b) seating the apparatus of the second aspect of the invention on a beam or joist or construction frame; (c) attaching the apparatus of the second aspect of the invention to the beam or joist or construction frame (for example, using screws or nails); and (d) installing an insulation board using the apparatus of the second aspect of the present invention. Step (b) may comprise seating the apparatus on the beam or joist or construction frame such that the pair of second walls do not overhang the beam or joist or construction frame. Step (d) may comprise aligning the edge of the insulation board with the second wall. Step (d) may comprise applying a force to the insulation board in the direction of the ledge. Step (d) may comprise applying the force to the insulation board in the direction of the ledge until a lower surface of the board contacts the ledge. Step (d) may comprise installing the insulation board such that an upper surface of the insulation board is provided at a height overlapping the layer of insulating material i.e., such that there are no gaps in the insulating material surrounding the beam. According to a fifth aspect of the present invention there is provided a method of installing at least one insulation board in the floor of a static caravan comprising the steps of: (a) providing the apparatus of either the first aspect or the second aspect of the present invention; (b) seating the apparatus of either the first aspect or the second aspect of the invention on a beam or joist or construction frame of the static caravan; (c) attaching the apparatus of either the first aspect or the second aspect of the invention to the beam or joist or construction frame (for example, using screws or nails); and (d) installing an insulation board using the apparatus of either the first aspect or the second aspect of the present invention. Step (b) may comprise seating the apparatus on the beam or joist or construction frame such that the or each second wall does not overhang the beam or joist or construction frame. Step (d) may comprise aligning the edge of an insulation board with the second wall. Step (d) may applying a force to the insulation board in the direction of the ledge. Step (d) may comprise applying the force to the insulation board in the direction of the ledge such that the lip engages the edge of the insulation board. Step (d) may comprise compressing the flap towards the second wall. Step (d) may comprise applying the force to the insulation board in the direction of the ledge until a lower surface of the board contacts the ledge. Step (d) may comprise aligning the edge of an insulation board with the second wall. Step (d) may comprise applying a force to the insulation board in the direction of the ledge. Step (d) may comprise applying the force to the insulation board in the direction of the ledge until a lower surface of the board contacts the ledge. Step (d) may comprise installing the insulation board such that an upper surface of the insulation board is provided at a height overlapping the layer of insulating material i.e., such that there are no gaps in the insulating material surrounding the beam. According to a sixth aspect of the present invention there may be provided a static caravan comprising the apparatus of the first aspect or the second aspect of the present invention. The static caravan may comprise at least one beam or a joist or a construction frame. The static caravan may comprise at least one insulation board. The or each beam or joist or construction frame may be provided with the apparatus of the first aspect of the invention or the second aspect of the invention. The or apparatus of the first aspect of the invention or the second aspect of the invention may be attached to each beam or joist or construction frame. The at least one insulation board may be retained by the apparatus of the first aspect of the invention or the second aspect of the invention. The at least one insulation board may be retained by the apparatus of the first aspect of the invention or the second aspect of the invention to form an under-floor layer. Detailed Description of the Invention In order that the invention may be more clearly understood one or more embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 shows an isometric view of an apparatus for retaining insulation boards according to the present invention; Figure 2 shows view of the apparatus of figure 1; Figure 3 shows a front view of the apparatus of figures 1 and 2 being used to install an insulation board on a beam; Figure 4 shows a front view of the apparatus of figures 1 and 2 being used to install an insulation board on a beam having a height less than that of the second walls; Figure 5 shows an isometric view of an apparatus for retaining insulation boards according to the present invention; Figure 6 shows a view of the apparatus of figure 5; Figure 7 shows a view of the apparatus of figures 5 and 6 in use with an insulation board installed; Figure 8 shows a front view of an apparatus for retaining insulation boards according to the present invention; and Figure 9 shows a view of the apparatus of figure 8 in use with an insulation board being installed. With reference to figures 1 and 2, an apparatus 1 for retaining insulation boards is shown. The apparatus comprises an elongate body 2 which has a first wall 3 and a pair of second walls 4. The pair of second walls 4 oppose each other and are provided in a substantially parallel arrangement. Each of the pair of second walls 4 comprises a proximal end 4a and a distal end 4b, and the first wall 3 is provided at the proximal end 4a of each of the second walls 4, and the second walls each extend perpendicular to the first wall 3 such that the elongate body 2 has a substantially “U” shaped cross section. Although this particular embodiment comprises a pair of second walls 4, in alternative embodiments a single second wall 4 may be provided such that the elongate body 2 comprises a substantially “L” shaped cross section. The distal end 4b of each of the second walls 4a further comprises a ledge 5 configured to support an insulation board (shown in figure 3). Each ledge 5 extends perpendicular to its respective second wall 4 but in the opposite direction to the first wall 3. In this embodiment, the ledge 5 is provided along the edge of the second wall 4 at the distal end 4b although it will be understood that the ledge may be provided a distance away from the edge of the second wall 4 and protrude therefrom. For example, the ledge 5 may be provided at a distance of 1 cm from the distal end of the second wall 4b. Each second wall 4 also comprises a flap 6 comprising a fixed end 6a and a free end 6b which extends away from the second wall. A lip 7 extends from the free end of the flap 6. In this particular embodiment, the flap 6 has a length (i.e., the distance between the fixed end and the free end of the flap) of approximately 2 cm and extends away from the second wall 4 towards the ledge 5 at an angle of approximately 45°. However, it will be understood that the flap may extend away from the second wall 4 towards the ledge 5 at a different angle, for example in the range of 10°-90°. The flap 6 has a curved profile which curves away from both the second wall 4 and the ledge 5. In alternative embodiments, the flap may have a linear profile. However, provision of a curved profile may help to secure the insulation boarding more securely as the reaction force generated due to compression and subsequent straightening of the flap 6 when installing the insulation board may be greater. The flap 6 extends along the entire length (L) of the elongate body 2. The fixed end 6a of the flap 6 is provided approximately 4 cm from the distal end 4b of the second wall 4. In alternative embodiments, the flap 6 may be reinforced about the fixed end 6a by providing a small amount of additional material such that the joint between the second wall 4 and the fixed end 4a of the flap is strengthened to help minimise the risk of failure in this area during use. The lip 7 comprises a fixed end 7a which is connected to the free end of the flap 6b and a free end 7b. The lip 7 extends from the fixed end of the lip 7a to the free end of the lip 7b in a direction away from the ledge 5, and away from the flap 6 at an angle of 90° to a plane extending between the fixed end 7a and the free end 7b of the flap 6. In this embodiment, the lip 7 extends away from the second wall 4 at an angle of approximately 45°, although it will be understood that there may be deviation in these angles without departing from the scope of the invention. In this particular embodiment, the lip 7 has a length i.e. the distance between the fixed end 7a and the free end 7b of the lip 7 of 0.4 cm. The lip 7 has a linear profile in this particular embodiment although it will be understood that the lip may also have a curved profile. The free end 7b of the lip 7 comprises an edge 8 which may be configured in use to engage the edge of the insulation board. The edge 8 may “cut” into the edge of the insulation board, such that in use, application of a downward force onto the insulation board will cause the edge 8 to engage the board and subsequently cause the flap 6 to deform. Each ledge 5 extends from the distal end 4b of the second wall 4, from a joint 9 formed therebetween. In this particular embodiment, the joint 9 is sharp although in alternative embodiments, the joint 9 may be curved slightly in order to improve ease of manufacture and distribute the stress placed on the joint. The ledge 5 may have a length i.e., it may extend from the distal end 4b of the second wall 4 by a length of approximately 2 cm such that the ledge 5 is of a sufficient depth to support the insulation board in use. In this particular embodiment, the ledge extends along the entire length of the elongate body 2 i.e., along the entire length of the second wall 4. The elongate body 2 is formed from uPVC although other materials compliant with building regulations and safety standards may also be used. The elongate body 2 is formed as a single piece i.e., the flap 6, the lip 7 and the ledge 5 are all integrally formed with the first wall 3 and the second walls 4. As such, the entire elongate body 2 may be formed in a single manufacturing operation e.g„ via extrusion or moulding. In this embodiment, the first wall 3 and the second walls 4 are solid walls i.e., there are no apertures, sections removed, or holes etc. However, in alternative embodiments, the first wall 3 may comprise a series of apertures such as rectangular, “L-shaped”, circular, “zig-zagged” or any other suitable shaped apertures which may assist in encouraging the circulation of air and mitigating the risk of entrapment of moisture. In addition, in alternative embodiments, the second walls 4 may comprise a series of approximately equidistant spaced apertures configured to receive a screw and / or nail therethrough. The first wall 3, the second walls 4, the ledge 5, the flap 6 and the lip 7 each have a thickness of 1 mm. Of course, in alternative embodiments different parts may have different thicknesses, the ledge 5 may have a different thickness to the flap 6 for example, or the entire apparatus may be of the same thickness which is greater than or lesser than 1 mm. In this embodiment, the first wall 3 has a width of approximately 5 cm, and the second walls 4 each have a height of approximately 13 cm. Both the first wall 3 and the second walls 4 (i.e., the elongate body 2) have a length of approximately 2.5 m, although the length of the elongate body 2 may vary and in use the elongate body 2 may be cut to size. As such, by cutting the elongate body 2 to size, it may be tailored to fit a specific beam or joist or construction frame during use. It will be understood that the dimensions of the first wall 3 and the second walls 4 may vary such that the apparatus 1 may be seated on beams or joists or construction frames of differing dimensions. In addition, the first wall 3 may comprise a central score line (not shown) provided along the entire length of the first wall 3 which enables the elongate body 2 to be divided into two corresponding halves. The elongate body 2 may be symmetric about the plane of the score line. The first wall 3 has a first face 10 and an opposing second face 11. The second face 11 is enclosed by the pair of opposing second walls 4. A layer of insulating material 12 is provided between the pair of second walls 4 adjacent to the second face 11 of the first wall 3. In this particular embodiment, the layer of insulating material 12 is formed from extruded polystyrene (XPS) and is adhered e.g., using glue, to the second face 11 ofthe first wall 3. The layer of insulating material 12 extends fully between the pair of opposing second walls 4 and is provided directly adjacent to (i.e., in contact with) the second face 11 of the first wall 3 and each of the pair of opposing second walls 4. In order to achieve this advantageous configuration, the layer of insulating material 12 has a substantially cuboidal form which conforms to the shape of the pair of opposing second walls 4 and the second face 11 of the first wall 3. The layer of insulating material 12 extends the entire length of the elongate body 2 such that the presence of gaps in the insulation which may encourage the formation of cold bridges is minimised. Therefore, the layer of insulating material 12 has a thickness i.e., depth of approximately 3.5 cm, a width of approximately 4.8 cm, and a length of approximately 2.5 m. The dimensions of the layer of insulating material 12 and in particular, the thickness may be adjusted. The thickness may be increased to be suitable when the apparatus 1 is seated on a beam having a height less than that of the pair of opposing second walls 4. This allows the layer of insulating material 12 to increase the effective height of the beam such that the required depth of insulation may be installed adjacent to either side of the beam without the insulation board overhanging the beam. With reference now to figure 3, in use, a beam 13 may be provided having an upper surface 13a and a pair of opposing side surfaces 13b. The beam may be wooden and provided in various locations within a property, for example in a roof or floor. The beam 13 may be mounted horizontally, vertically, or in any other angled arrangement. The beam may be of any dimension, but in this particular embodiment, the beam 13 has a width of approximately 4.7 cm. The elongate body 2 is seated over the beam 13 such that the layer of insulating material 12 is positioned on the upper surface of the beam 13a, and the second walls 4 overhang the pair of opposing side surfaces 13b. When the elongate body 2 is seated over the beam 13, it may be secured in place using suitable attachment means such as a plurality of screws and / or nails (not shown) spaced apart at approximately equal distances. An insulation board 14 is provided having an upper surface 14a, a pair of opposing edge surfaces 14b, and a lower surface 14c. The insulation board 14 is positioned such that one edge surface 14b is positioned adjacent and parallel to the second wall 4. Once in position, a downward force is exerted on the insulation board 14 in the direction of the ledge 5. As the insulation board 14 moves towards the ledge, the edge 8 of the lip 7 engages the edge surface 14b of the insulation board 14, effectively “cutting” into the insulation board 14 and gripping the board. Although not shown in figure 3, in use, the insulation board 14 is typically fitted into a gap provided between adjacent beams 13. An elongate body 2 may be seated on each beam 13, the insulation board 14 may be cut to the correct size, and then the insulation board 14 may be fitted into place by applying a downward force such that the opposing edges of the insulation board 14 may compress the respective flaps 6, thereby securing the insulation board 14 in place. The downward force is exerted until the lower surface 14c of the insulation board 14 contacts and is supported by the ledge 5. The flap 6 is configured to resiliently deform into a compressed position as seen on the left-hand side of figure 3. The curved profile of the flap 6 straightens until it is substantially linear and substantially parallel to the second wall 4. The flap 6 exhibits resistance to application of force but deforms upon application of force above a predetermined threshold. The lip 7 remains engaged with the edge surface 14b of the insulation board 14 such that the insulation board 14 is held in position by the reaction force generated by the flap and the secure engagement of the lip 7. In the compressed position, the lip 7 remains at an angle of approximately 90° to the flap 6. Although the flap 6 straightens until it is substantially linear, this may mean that the flap 6 still exhibits slight curvature. As such, the lip is provided at an angle of 90° to the plane extending between the fixed end 6a and the free end 6b of the flap 6. This means that should the flap 6 begin to return to its original curved position, the lip 7 remains engaged with the insulation board 14 approximately perpendicular to the edge surface 14b, such that the insulation board 14 remains securely in place. This is particularly advantageous compared to a flap 6 which does not comprise a lip 7 as in such instances, the free end of the flap 6b creates an edge 8 which is provided diagonally to the second wall 4, cutting into the edge surface 14b of the insulation board 14. This may lead to the bottom edge of the insulation board “breaking out” as cracks propagate through the insulation board 14. However, provision of a lip 7 minimises the risk of cracks propagating through the insulation board 14, thereby minimising the risk of the bottom edge of the insulation board 14 “breaking out” or causing a gap in the insulation around the beam 13 which may form a cold bridge. Although figure 3 appears to show a gap between the insulation board 14 and the second wall 4, and between the second wall 4 and the opposing side surface 13b this is just for clarity. In practice, the insulation board 14 is cut to the size of the gap between adjacent beams 14 such that there is a tight fit therebetween. As such, when the downward force is exerted, the insulation board 14 compresses the second wall 4 towards the side surface 13b of the beam minimising the presence of gaps and thereby minimising the airflow through such gaps. A second insulation board 14 may be installed on the opposite side of the beam 13 using the opposing second wall 4. Once installed, the apparatus 1 provides improved retention of insulation boards 14 and minimises the effects of cold bridging. There is a continuous layer of insulation provided adjacent to the upper surface 13a and a pair of opposing side surfaces 13b of the beam 13. The layer of insulating material 12 is provided adjacent to the upper surface 13a of the beam, and the insulation boards 14 are provided adjacent to the pair of opposing side surfaces 13b of the beam 13. Therefore, there are no gaps in the insulation provided where cold bridges may form, and the temperature of the area surrounding the beam 13 is substantially constant due to the provision of the insulation 12, 14. This helps to reduce the dissipation of heat through the beam or joist or construction frame, and helps to minimise the formation of condensation and subsequent mould formation caused by the temperature difference between the cold bridge and the surrounding area. With reference now to figure 4, a beam 13 is provided having a height less than that of the pair of opposing second walls 4. In this instance, the layer of insulating material 12 increases the effective height of the beam 13 i.e., if the layer of insulating material 12 was not provided, the second face 11 of the first wall 3 would be in direct contact with the upper surface of the beam 13a. This would mean that the pair of opposing side walls 4 would overhang the beam 13, making installation of the insulation boards 14 more difficult and less secure and particularly interfering with the arrangement of other building materials, e.g. plaster board panels intended to be attached to the underside 13c ofthe beam. However, provision ofthe layer of insulating material 12 increases the effective height of the beam 1 such that the ledge 5 is approximately aligned with the lower surface of the beam 13c and the pair of opposing side walls 4 do not overhang the beam 13. This allows the regulation depth of 150 mm of insulation boarding 14 to be installed adjacent to the opposing side surfaces 13b of the beam 13 even though the beam 13 itself has a height of less than 150 mm. With reference now to figures 5 to 7, an alternative embodiment of the present invention is shown. This embodiment shares many like features with the embodiment shown in figures 1-5 and as such, only differing features will be described herein. With reference initially to figures 5 and 6, the apparatus 1 comprises a means for attaching 15 the layer of insulating material 12 in the form of a pair barbs 15 which each extend along the entire length of the elongate body 2. Each barb 15 comprises a main body 17 and a projection 18. The main body 17 of each barb 15 is straight and extends perpendicularly from the second face 11 of the first wall 3 of the elongate body 2 to a free end 19. Each barb 15 is provided at a distance of approximately one third of the width of the of the first wall from each of the pair of opposing second walls 4 respectively. Each barb 15 comprises a projection 18 at the free end 19. The projection 18 has a first end 18a and a second end 18b, and a plane extending therebetween. In this embodiment, the projection 18 has a concavely curved profile however, it will be appreciated that in alternative embodiments, the projection 18 may have a straight profile. The projection 18 of each of the pair of barbs 15 extend in opposite directions to each other, away from their respective main bodies 17. In this particular embodiment, the plane of each projection 18 extends away from their respective main bodies 17 at an angle of approximately 45°, towards the second face 11 of the first wall 3. With particular reference to figure 7, in use, the layer of insulating material 12 may be attached during the manufacturing process and supplied ready-installed, in the same manner as the first embodiment. Alternatively, the apparatus 1 may be supplied without a layer of insulating material, and an installer can thus cut the layer of insulating material 12 to the correct depth depending on the height of the beam 13 or joist or construction frame to which it will be applied (this could even include cutting the insulating material to varying heights to take account of a non-uniform joist or the like, such as can be encountered in old buildings). The layer of insulating material 12 is then placed between the pair of substantially parallel opposing second walls 4 and a force is applied to the layer of insulating material 12 in the direction of the first wall. Consequently, the barbs 15 pierce the layer of insulating material 12 and the layer of insulating material 12 is retained in place by each projection 18 which hooks into the layer of insulating material 12. The elongate body 2 may then be seated over the beam 13 such that the layer of insulating material 12 is positioned on the upper surface of the beam 13a, and the second walls 4 overhang the pair of opposing side surfaces 13b. When the elongate body 2 is seated over the beam 13, it may be secured in place using suitable attachment means such as a plurality of screws and / or nails (not shown) spaced apart at approximately equal distances, and the insulation board 14 may be installed as outlined previously in relation to the embodiment of figures I to 4. In this particular embodiment, the elongate body 2 comprises a pair of flaps 6 which do not incorporate the advantageous lip 7 of the first embodiment as it is envisaged that the advantageous lip 7 may be applied to apparatus which does not include insulation, and as in this embodiment the advantageous insulation or means for attaching it can be provided in apparatus which does not include the advantageous lip 7 - this might for example be preferable from the point of view of simplicity of manufacture. The insulation board 14 is fitted into place by applying a downward force such that the opposing edges of the insulation board 14 compress the respective flaps 6, thereby securing the insulation board 14 in place. As there is no lip 7 provided in this embodiment, the flap 6 can be seen to cut into the edge surface 14b of the insulation board 14 somewhat. This is due to the free end 6b of the flap 6 cutting diagonally into the edge surface 14b of the insulation board 14 as the flap 6 begins to curve slightly. The downward force is exerted until the lower surface 14c of the insulation board 14 contacts and is supported by the ledge 5. Although in this particular embodiment, the pair of flaps 6 are not shown completely compressed until they are substantially parallel against their respective second walls 4, it will be understood that if the insulation board 14 was a slightly tighter fit, the flaps 6 would be compressed until they were substantially parallel with their respective second walls 4. Although the flaps 6 in the embodiment of figures 5 to 7 do not comprise a lip 7, the skilled person will equally understand that this feature may also be incorporated in this second embodiment of the invention. With reference now to figures 8 and 9, an alternative embodiment of an apparatus 1 for retaining insulation boards is shown. This embodiment shares many like features with the embodiment shown in figures 1-7 and as such, like features have been given equivalent reference numerals. The apparatus comprises an elongate body 2 having a first wall 3 and a pair of opposing second walls 4. Each of the pair of opposing second walls 4 comprises a ledge 5 positioned between the proximal end 4a and the distal end 4b of each second wall 4. Each ledge 5 extends perpendicular to its respective second wall 4 but in the opposite direction to the first wall 3 and is configured to support an insulation board (shown in figure 9). Each second wall 4 also comprises a flap 6 having a fixed end 6a which is provided at the distal end of the second wall 4b, and a free end 6b which extends away from the second wall 4 towards the ledge 5. A lip 7 extends from the free end of the flap 6. However, the skilled person will appreciate that in alternative embodiments the apparatus 1 may not comprise a lip 7. Tn this particular embodiment, the flap 6 has a length (i.e., the distance between the fixed end and the free end of the flap) of approximately 2 cm and extends away from the second wall 4 towards the ledge 5 at an angle of approximately 45°. However, it will be understood that the flap may extend away from the second wall 4 towards the ledge 5 at a different angle, for example in the range of 10°-90°. The flap 6 has a curved profile which curves away from both the second wall 4 and the ledge 5. In alternative embodiments, the flap may have a linear profile. However, provision of a curved profile may help to secure the insulation boarding more securely as the reaction force generated due to compression and subsequent straightening of the flap 6 when installing the insulation board may be greater. The lip 7 comprises a fixed end 7a which is connected to the free end of the flap 6b and a free end 7b. The lip 7 extends from the fixed end of the lip 7a to the free end of the lip 7b in a direction away from the ledge 5, and away from the flap 6 at an angle of 90° to a plane extending between the fixed end 7a and the free end 7b of the flap 6. In this embodiment, the lip 7 extends away from the second wall 4 at an angle of approximately 45°, although it will be understood that there may be deviation in these angles without departing from the scope of the invention. In this particular embodiment, the lip 7 has a length i.e. the distance between the fixed end 7a and the free end 7b of the lip 7 of 0.4 cm. The lip 7 has a linear profile in this particular embodiment although it will be understood that the lip may also have a curved profile. The free end 7b of the lip 7 comprises an edge 8 which may be configured in use to engage the edge of the insulation board. The edge 8 may “cut” into the edge of the insulation board, such that in use, application of a downward force onto the insulation board will cause the edge 8 to engage the board and subsequently cause the flap 6 to deform. The ledge 5 has a length i.e., it extends from the second wall 4 by a length of approximately 2 cm such that the ledge 5 is of a sufficient depth to support the insulation board in use. In this particular embodiment, the ledge 5 extends along the entire length of the elongate body 2 i.e., along the entire length of the second wall 4. The first wall 3, the second walls 4, the ledge 5, the flap 6 and the lip 7 each have a thickness of 1 mm. Of course, in alternative embodiments different parts may have different thicknesses, the ledge 5 may have a different thickness to the flap 6 for example, or the entire apparatus may be of the same thickness which is greater than or lesser than 1 mm. The first wall 3 has a width of approximately 5 cm and the second walls each have a height of approximately 7.5 cm. In this embodiment, the ledge 5 is provided approximately halfway between the proximal end of the second wall 4a and the distal end of the second wall 4b. Both the first wall 3 and the second walls 4 (i.e., the elongate body 2) have a length of approximately 2.5 m, although the length of the elongate body 2 may vary and in use the elongate body 2 may be cut to size. As such, by cutting the elongate body 2 to size, it may be tailored to fit a specific beam or joist or construction frame during use. It will be understood that the dimensions of the first wall 3 and the second walls 4 may vary such that the apparatus 1 may be seated on beams or joists or construction frames of differing dimensions. It will also be understood that the ledge 5 may be provided at any position on the second wall 4 as long as each flap 6 may be moved to the compressed position without the ledge interfering with this movement. The layer of insulating material 12 extends fully between the pair of opposing second walls 4 and is provided directly adjacent to (i.e., in contact with) the second face 11 of the first wall 3 and each of the pair of opposing second walls 4. In order to achieve this advantageous configuration, the layer of insulating material 12 has a substantially cuboidal form which conforms to the shape of the pair of opposing second walls 4 and the second face 11 of the first wall 3. The layer of insulating material 12 extends the entire length of the elongate body 2 such that the presence of gaps in the insulation which may encourage the formation of cold bridges is minimised. In this embodiment, the layer of insulating material 12 has a thickness i.e., depth of approximately 2.5 cm, a width of approximately 4.8 cm, and a length of approximately 2.5 m. However, the skilled person will appreciate that the layer of insulating material 12 may vary for use in a variety of orientations and dimensions. With particular reference now to figure 9, in use, a beam 13 is provided having an upper surface 13a, a pair of opposing side surfaces 13b, and a lower surface 13c. In contrast to the embodiments of figures 1-7, the elongate body 2 is seated on the beam 13 such that the layer of insulating material 12 is positioned on the lower surface of the beam 13c, and the second walls 4 are adjacent to the pair of opposing side surfaces 13b. When the elongate body 2 is seated on the underside of the beam 13, it is secured in place using suitable attachment means such as a plurality of screws and / or nails (not shown) spaced apart at approximately equal distances. By seating the apparatus I on the beam in this orientation i.e., from the lower surface 13c of the beam, the apparatus 1 may be used on beams 13 of various depths, whilst ensuring that the insulation is on the underside, and the ledge is a fixed distance from the underside of the beam, defined by the distance from the underside of the insulation material to the ledge. An insulation board 14 is provided having an upper surface 14a, a pair of opposing edge surfaces 14b, and a lower surface 14c. The insulation board 14 is positioned such that one edge surface 14b is positioned adjacent and parallel to the second wall 4. Once in position, a downward force is exerted on the insulation board 14 in the direction of the ledge 5. As the insulation board 14 moves towards the ledge, the edge 8 of the lip 7 engages the edge surface 14b of the insulation board 14, effectively “cutting” into the insulation board 14 and gripping the board 14. The downward force is exerted until the lower surface 14c of the insulation board 14 contacts and is supported by the ledge 5. The flap 6 is configured to resiliently deform into a compressed position. Although figure 9 appears to show a gap between the insulation board 14 and the second wall 4, this is just for clarity. In practice, the insulation board 14 is cut to the size of the gap between adjacent beams 14 such that there is a tight fit therebetween. As such, when the downward force is exerted, the insulation board 14 compresses the second wall 4 towards the side surface 13b of the beam minimising the presence of gaps and thereby minimising the airflow through such gaps. The ledge 5 is provided a fixed distance from the first wall 3. This means that in use, the insulation board 14, which is in contact with the ledge 5, is also provided at a fixed distance from-the first wall 3. This distance is particularly advantageous when in use in a roof for example, as regardless of the depth of the beam 13, the insulation board 14 may be accurately positioned such that the gap between the insulation board and the first wall 3 and any additional insulation and / or plasterboard attached to the lower surface of the beam 13c and positioned at the face of the first wall 3 may be controlled. As such, the depth of the air gap between the insulation board 14 and any additional insulation and / or plasterboard may be controlled to provide an air space that can contribute to improve the thermal performance of the roof or to provide a void for services to be run without compromising the thermal integrity of the insulation board 14. A second insulation board 14 may be installed on the opposite side of the beam 13 using the opposing second wall 4. Once installed, the apparatus 1 provides improved retention of insulation boards 14 and minimises the effects of cold bridging. The insulation board 14 in this embodiment may be of varying thicknesses. For example, the insulation board 14 may have a thickness of at least 150 mm. This means that the apparatus 1 of figures 8 and 9 may accommodate changes in the regulation thicknesses of insulation boarding 14. One installed, for example, in a roof of a house, plasterboard panels (not shown) may be attached to the lower surface of the beam 13c through the layer of insulating material 12. In alternative embodiments, the layer of insulating material may not be present, and in such instances, the plasterboard panels may be attached to the lower surface of the beam 13c through the first wall 3. Furthermore, the installed insulation boards 14 provide a flat surface proximal to the upper surface 13a of the beam 13. A breathing membrane and / or additional layer of insulation may be applied on top of the 5 beam 13 and insulation board 14 such that ventilation within the roof is improved and the formation of cold bridges on the upper surface 13a of the beam 13 is minimised. The one or more embodiments are described above by way of example only. Many variations are possible without departing from the scope of protection afforded by the appended claims. 10

Claims

1. An apparatus for retaining insulation boards comprising: an elongate body having at least a first wall and a second wall, the second wall comprising a proximal end and a distal end;wherein the first wall is provided at the proximal end of the second wall and extends perpendicular to the second wall; andwherein the second wall further comprises a flap extending away from the second wall, the flap having a fixed end and a free end, and a lip extending from the free end of the flap.

2. The apparatus of claim 1 wherein the second wall comprises a ledge configured to support an insulation board.

3. The apparatus of any preceding claim wherein the flap is configured to deform into a compressed position wherein the flap is substantially parallel to the second wall.

4. The apparatus of any preceding claim wherein the lip extends away from the flap at an angle in the range of 45°-105°.

5. The apparatus of any preceding claim wherein the lip extends away from the flap at an angle in the range of 65°-100°.

6. The apparatus of any preceding claim wherein the lip extends away from the flap at an angle in the range of 85°-95°.

7. The apparatus of any preceding claim wherein the lip has a length in the range of 0.1 cm-1.5 cm.

8. The apparatus of any preceding claim wherein the lip has a length in the range of 0.15 cm-1 cm.

9. The apparatus of any preceding claim wherein the lip extends away from the flap at a constant angle with respect to a plane extending between the fixed end and the free end of the flap.

10. The apparatus of any preceding claim wherein the elongate body comprises a pair of opposing second walls.

11. The apparatus of claim 10 wherein each second wall comprises a proximal end and a distal end, and the proximal ends of each second wall are connected to the first wall; andwherein the first wall has a first face and an opposing second face; the second face being enclosed by the pair of opposing second walls, and wherein a layer of insulating material is provided between the pair of second walls adjacent to the second face of the first wall or the apparatus comprises means for attaching a layer of insulating material between the pair of second walls adjacent to the second face of the first wall.

12. An apparatus for retaining insulation boards comprising: an elongate body having at least a first wall and a pair of substantially parallel opposing second walls, wherein each second wall comprises a proximal end and a distal end, and the proximal ends of each second wall are connected to the first wall; and wherein the first wall has a first face and an opposing second face; the second face being enclosed by the pair of opposing second walls, and wherein a layer of insulating material is provided between the pair of second walls adjacent to the second face of the first wall or the apparatus comprises means for attaching a layer of insulating material between the pair of second walls adjacent to the second face of the first wall.

13. The apparatus of claim 13 wherein each second wall comprises a ledge configured to support an insulation board.

14. The apparatus of either claim 11 or 12 wherein the layer of insulating material is formed from extruded polystyrene (XPS).

15. The apparatus of either claim 11 or claim 12 wherein the means for attaching the layer of insulating material comprises at least one barb.

16. The apparatus of any of claims 11-14 wherein the layer of insulating material extends fully between the pair of opposing second walls.

17. The apparatus of any of claims 11-15 wherein the layer of insulating material has a thickness in the range of 1 cm-10 cm.

18. A static caravan comprising the apparatus of any preceding claim.

19. The static caravan of claim 18 further comprising at least one beam or ajoist or a construction frame and at least one insulation board, wherein the apparatus is attached to each beam or joist or construction frame, and wherein the at least one insulation board is retained by the apparatus to form an under-floor layer.

20. A method of installing at least one insulation board comprising the steps of:(a) providing the apparatus of any of claims 1-11;(b) seating the apparatus of any of claims 1-11 on a beam or joist or construction frame;(c) attaching the apparatus any of claims 1-11 on the beam or joist or construction frame;(d) installing an insulation board using the apparatus of any of claims 1-11.

21. The method of claim 21 wherein step (d) further comprises aligning the edge of the insulation board with the second wall; applying a force to the insulation board in the direction of the ledge such that the lip engages the edge of the insulation board; and compressing the flap towards the second wall.

22. A method of installing at least one insulation board comprising the steps of:(a) providing the apparatus of any of claims 12-17;(b) seating the apparatus of any of claims 12-17 on a beam or joist or construction frame;(c) attaching the apparatus any of claims 12-17 on the beam or joist or construction frame;(d) installing an insulation board using the apparatus of any of claims 12-17.

23. The method of claim 22 wherein step (b) comprises seating the apparatus on the beam or joist or construction frame such that the pair of second walls do not overhang the beam or joist or construction frame.

24. The method of claim 22 wherein step (d) comprises installing the insulation board such that an upper surface of the insulation board is provided at a height overlapping the layer of insulating material.

25. A method of installing at least one insulation board in the floor of a static caravan comprising the steps of:(a) providing the apparatus any of claims 1-17;(b) seating the apparatus of any of claims 1-17 on abeam or joist or construction frame;(c) attaching the apparatus of any of claims 1-17 to the beam or joist or construction frame; and5 (d) installing an insulation board using the apparatus of any of claims 1-17.

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