WO2007107767A1 - Structures d'isolation thermique comprenant des espaces d'air et des surfaces de faible emissivite - Google Patents

Structures d'isolation thermique comprenant des espaces d'air et des surfaces de faible emissivite Download PDF

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Publication number
WO2007107767A1
WO2007107767A1 PCT/GB2007/001029 GB2007001029W WO2007107767A1 WO 2007107767 A1 WO2007107767 A1 WO 2007107767A1 GB 2007001029 W GB2007001029 W GB 2007001029W WO 2007107767 A1 WO2007107767 A1 WO 2007107767A1
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WO
WIPO (PCT)
Prior art keywords
emissivity
low
cavity
foil
structure according
Prior art date
Application number
PCT/GB2007/001029
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English (en)
Inventor
John Payne
Mark Hughes
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Hunt Technology Limited
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Publication date
Application filed by Hunt Technology Limited filed Critical Hunt Technology Limited
Publication of WO2007107767A1 publication Critical patent/WO2007107767A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D12/00—Non-structural supports for roofing materials, e.g. battens, boards
    • E04D12/002—Sheets of flexible material, e.g. roofing tile underlay
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/7608—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising a prefabricated insulating layer, disposed between two other layers or panels
    • E04B1/7612—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising a prefabricated insulating layer, disposed between two other layers or panels in combination with an air space
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/02—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls built-up from layers of building elements
    • E04B2/28—Walls having cavities between, but not in, the elements; Walls of elements each consisting of two or more parts kept in distance by means of spacers, all parts being solid
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B7/00—Roofs; Roof construction with regard to insulation
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • E04D13/16—Insulating devices or arrangements in so far as the roof covering is concerned, e.g. characterised by the material or composition of the roof insulating material or its integration in the roof structure
    • E04D13/1606—Insulation of the roof covering characterised by its integration in the roof structure
    • E04D13/1612—Insulation of the roof covering characterised by its integration in the roof structure the roof structure comprising a supporting framework of roof purlins or rafters
    • E04D13/1618—Insulation of the roof covering characterised by its integration in the roof structure the roof structure comprising a supporting framework of roof purlins or rafters with means for fixing the insulating material between the roof covering and the upper surface of the roof purlins or rafters
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • E04D13/16—Insulating devices or arrangements in so far as the roof covering is concerned, e.g. characterised by the material or composition of the roof insulating material or its integration in the roof structure
    • E04D13/1606—Insulation of the roof covering characterised by its integration in the roof structure
    • E04D13/1612—Insulation of the roof covering characterised by its integration in the roof structure the roof structure comprising a supporting framework of roof purlins or rafters
    • E04D13/1625—Insulation of the roof covering characterised by its integration in the roof structure the roof structure comprising a supporting framework of roof purlins or rafters with means for supporting the insulating material between the purlins or rafters
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • E04D13/16—Insulating devices or arrangements in so far as the roof covering is concerned, e.g. characterised by the material or composition of the roof insulating material or its integration in the roof structure
    • E04D13/1606—Insulation of the roof covering characterised by its integration in the roof structure
    • E04D13/1612—Insulation of the roof covering characterised by its integration in the roof structure the roof structure comprising a supporting framework of roof purlins or rafters
    • E04D13/1637—Insulation of the roof covering characterised by its integration in the roof structure the roof structure comprising a supporting framework of roof purlins or rafters the roof purlins or rafters being mainly insulated from the interior, e.g. the insulating material being fixed under or suspended from the supporting framework
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B2001/7691—Heat reflecting layers or coatings

Definitions

  • This invention relates to thermal insulation structures for use in buildings and more particularly to thermal insulation structures that contain low-emissivity surfaces in contact with unfilled air layers.
  • Unventilated air spaces are good barriers to thermal conduction. Small air spaces of less than 20 mm in thickness are less susceptible to convection currents than thicker air spaces. Surrounding the air space by low-emissivity surfaces reduces radiation through the space. The optimum insulation properties for a non- ventilated air space can be calculated using known equations - these are described in BS EN ISO 6946:1996 as follows:
  • the thermal resistance of an air space R g is given by:
  • h a is the conduction/convection coefficient and h,- is the radiation coefficient.
  • h a is the larger of 1.25 or 0.025/d W/m K, where d is the thickness in metres of the air space in the heat flow direction.
  • d is the thickness in metres of the air space in the heat flow direction.
  • the table shows that the component of the thermal resistance due to conduction and convention increases with thickness up to 20 mm. In this region, convection is inhibited and conduction is the major means of heat flow. Beyond this point, the thermal resistance is constant as convection takes over. Clearly the optimum thickness for the insulation capacity of an air space is 20 mm.
  • h r Eh ro ,
  • ⁇ ⁇ and e 2 are the hemispherical emissivities of the surfaces bounding the air space.
  • This equation can be used to calculate E for surfaces of varying emissivities.
  • the surface of a normal building material such as wood or plasterboard will typically have an emissivity of 0.8.
  • An air space inside two such materials would have an interspace emittance of 0.67.
  • the thermal resistance R of 5mm and 20mm air spaces in m K/W are shown below:
  • the table shows clearly two features, as discussed below.
  • Effective insulation for a roof or wall structure in a building should contain the following characteristics: • Good barrier to heat transfer by all three methods - conduction, convection and radiation;
  • air layers form effective insulation barriers to the loss of heat by conduction, and indeed air spaces are an important component of many insulated structures such as walls and roofs.
  • large air gaps are susceptible to heat transfer by convection as air currents can be established therein, drawing warm air from one side of the air gap to the other.
  • Air trapped in small layers where convection is inhibited forms the basis of many conventional insulation materials such as textile constructions, bubble films, mineral wool and foam boards or panels.
  • thermal resistance of an air space is increased when the surfaces adjacent to that space have a low-emissivity.
  • the thermal resistance is increased noticeably when both opposing surfaces are of low-emissivity - one surface will reflect any incident radiation, whilst the opposing surface will absorb very little incident radiation.
  • Air spaces bounded by a low-emissivity surface are known to be effective insulators. Some insulation products use a low-emissivity surface in conjunction with an air space. Examples include foil-backed plasterboard or metallised membranes such as that sold by DuP ont under the trade mark "Tyvek Reflex". Use of these materials generally provides only one low-emissivity surface in the entire insulation structure.
  • Glass wool also has surprisingly low emissivity surfaces. This material is used in roof and wall insulation, but traditionally has not been used adjacent to unventilated air spaces.
  • a final class of insulating material is a multi-foil product having two outer layers with low-emissivity and multiple internal layers bounded by foils. Importantly the surfaces presented by these layers do not border unfilled air spaces but border layers of insulating material such as polyurethane foam or fibre wadding.
  • Such multi-foil insulating systems may comprise up to six foils arranged around layers of low-conductivity material such as foam or wadding.
  • a common feature of such products is that the thickness of the layer between foils is typically around 5 mm. If the layers were any thicker, the material would become unmanageably thick, and hence difficult to manufacture and install.
  • Such multi- foil materials are not capable of giving the 20 - 25 mm air spaces that optimise the thermal resistance of air whilst inhibiting convection.
  • DEl 0236151 describes double glass walls which are evacuated and silvered and which present two low-emissivity surfaces.
  • a multi-layer insulation product has aluminium low-emissivity foils interspersed with bubble wrap with two low-emissivity surfaces in contact with an air layer. There are other surfaces in contact with bubble film, but these are thin (5 mm) layers and contain a solid material which reduces the effectiveness of the low-emissivity surface.
  • US 4,777,086 discloses an insulating material positioned between reflective films but provides two low-emissivity surfaces in contact with an air layer.
  • UK 2,398,758 discloses a multi-foil insulation material with interleaved batts and reflective foils.
  • the batts may be perforated giving air holes inside the layers of insulating materials.
  • the material surrounding the perforations nevertheless provides a cold bridge for conduction of heat.
  • the main object of the present invention is to provide a thermal insulation structure for use in buildings which overcomes or at least substantially reduces the aforementioned problems of insulating buildings.
  • the present invention resides in a thermal insulation structure for use in buildings comprising means defining a cavity having at least one surface of low emissivity; separating means suspended within the cavity so as to define at least two air spaces, the separating means comprising two surfaces of low emissivity; thereby to define a structure having at least two air spaces and at least three surfaces of low emissivity.
  • the present invention resides in a thermal insulation structure for use in buildings comprising: means defining a cavity; separating means suspended within the cavity so as to define at least two air spaces, the separating means comprising at least three surfaces of low emissivity; thereby to define a structure having at least two air spaces and at least three surfaces of low emissivity.
  • the present invention further optimises the insulation value of air spaces in a roof structure by isolating air spaces, i.e. the separating means is preferably spaced from the nearest surface within the cavity by a distance within the range of 5 mm to 100 mm and more preferably within the range of 10 mm to 50 mm and preferably still within the range of 20 mm to 25 mm.
  • Such insulation structures may be used in a variety of buildings including dwellings and commercial buildings, log cabins, mobile homes and caravans.
  • the cavity-defining means may comprise one or more of the following: roof rafters, roof joists, battens and timber stud or cavity walls.
  • the low-emissivity surfaces each have an emissivity in the range 0.05 to 0.4, and preferably in the range 0.1 to 0.25.
  • At least one of the low-emissivity surfaces is selected from the following: foil-backed plasterboard, multi-foil insulation, foil-backed or aluminised bubblewrap, foil-backed polyurethane board, aluminised roofing membrane, aluminised film and aluminium film, glass or mineral wool.
  • the low-emissivity surfaces may alternatively comprise aluminium film coated with one of a thin protective layer and a reflective aluminium tape.
  • Products with low-emissivity surfaces that can be combined in this way include, but are not limited, to multi-foil insulation material, such as that sold under at least one of the following trade marks: "Thinsulex” by Web Dynamics Limited, "SuperQuilt 14" by Oxford Building Supplies and/or “Tri-Iso Super 9” and “Triso Super 10" by Actis SA.
  • multi-foil insulation material typically defines a 5 mm insulated space between foils.
  • Multi-foil insulation material of the type sold under the trade mark ThinsulexTM is disclosed in the specification of the Applicant's International Patent Application No. PCT/GB2005/004085.
  • the least one of the low-emissivity surfaces may comprise aluminised roofing membrane, as sold under the trade mark "Web27” by Web Dynamics Limited or as “Tyvek Reflex” by duPont Ltd..
  • the cavity additionally contains at least one of the following forms of insulation: mineral wool; glass fibre; natural wool; synthetic wool; synthetic polymers; and bubble film.
  • spacers are used to separate the insulation and hence provide an additional airspace.
  • These spacers constitute any device that serves to keep the insulation separated from at least one of the low-emissivity surfaces.
  • the spacer preferably comprises an insulating material, e.g. polyurethane foam or polystyrene foam.
  • the separating means comprises at least one double-sided multi-foil insulating material.
  • the cavity-defining means may further comprise plasterboard backed with foil to provide a third low-emissive surface, alternatively, foil-backed bubble wrap can be utilised.
  • the cavity-defining means may further comprise a metallised roofing membrane, such as that described in the present Applicant's Patent No. GB 2355430.
  • the separating means may further comprise at least one double-sided foil suspended within the cavity.
  • the structure may be arranged for location in a roof space above, below or between rafters; in joist spaces; above a ceiling; inside cavity walls; across timber studs used in timber frame walls or to line solid masonry walls and below flooring of the roof.
  • the above structures provide extremely high thermal resistances, whilst being very lightweight, thin and easy to install. These structures are able to meet the thermal insulation requirements for buildings as set out in the Building Regulations for England and Wales ("The Building Regulations 2000: Conservation of fuel and power Part Ll" introduced in 2006).
  • Such insulation structures with low-emissivity surfaces may be installed in a roof structure in order to form such air spaces and hence effective thermal insulation structures that are light-weight, easy to install, environmentally harmless and do not add extra thickness to the roof structure.
  • the insulation value of air spaces is maximised by forming non- ventilated unfilled air spaces of around 20 to 30 mm with low-emissivity surfaces on each side.
  • the invention extends to a roof structure, a wall structure or a building including any of the insulation structures defined above.
  • the invention further extends to a method for enhancing the thermal insulation of a cavity within a building, the cavity being provided with at least one surface of low emissivity, the method comprising separating the cavity into at least two air spaces by means comprising two surfaces of low emissivity, thereby to provide a cavity having at least two air spaces and at least three surfaces of low emissivity.
  • the invention further extends to a method for enhancing the thermal insulation of a cavity within a building, the method comprising separating the cavity into at least two air spaces by means comprising at least three surfaces of low emissivity, thereby to provide a cavity having at least two air spaces and at least three surfaces of low emissivity.
  • the thermal resistance R of roofing components can be measured using standard techniques such as heat flow meter, guarded hot plate or guarded hot box.
  • the total thermal resistance of a structure containing multiple components can be calculated by adding together the thermal resistances of all the components. Allowance must be made for cold bridges, for examples rafters or battens that provide routes of lower thermal resistance for heat flow through the structure.
  • British Standard 6946:1996 gives a process for calculating the total thermal resistance of a multi-component structure.
  • the thermal transmittance or U- value of a structure is the inverse of R:
  • the U- value is determined by first calculating the overall R- value of the structure, then taking the inverse.
  • Software is available for calculating complex R- and U-values, for example the BRE supply a commercial software package entitled "Calculation of U- values following convention in BRE BR 443 'Conventions for U- value calculations', version 1.10".
  • Figure 1 is a perspective view of a standard roof structure
  • Figure 2 is a cross-sectional plan view of a thermal insulation structure according to a first embodiment of the present invention
  • Figure 3 is a cross-sectional plan view of a thermal insulation structure according to a second embodiment of the present invention.
  • Figure 4 is a perspective view of the arrangement shown in Figure 3;
  • Figure 5 is a cross-sectional plan view of a thermal insulation structure according to a third embodiment of the present invention.
  • Figure 6 is a cross-sectional plan view of a thermal insulation structure according to a fourth embodiment of the present invention.
  • Figure 7 is a cross-sectional plan view of a thermal insulation structure according to a fifth embodiment of the present invention.
  • Figure 8 is a cross-sectional plan view of a thermal insulation structure according to a sixth embodiment of the present invention
  • Figure 9 is a perspective view of the arrangement shown in Figure 8;
  • Figure 10 is a cross-sectional plan view of a thermal insulation structure according to a seventh embodiment of the present invention.
  • a conventional roof structure 1 for a building comprises a sheet of plasterboard 2, one side of which serves to provide an inside surface 7, e.g. a ceiling surface, for an interior space in the building, e.g. a loft.
  • a series of parallel back battens 3 run along the length of the plasterboard 2 and are attached to one face of the plasterboard 2.
  • a plurality of parallel rafters 4 are arranged with their lengths perpendicular to the back battens 3.
  • Each rafter 4 is attached to each of the battens 3 at the positions where their surfaces cross and is further attached to a second series of front battens 6 via a membrane 5 which extends over substantially the same area as the plasterboard 2, the membrane 5 draping into the space between the rafters.
  • the front battens 6 lie parallel with the back battens 3, the space between the front and the back battens 3, 6 being substantially equal to the width of each rafter 4.
  • the front battens 6 act as a mounting facility for the tiles of the roof.
  • the membrane 5 separates the air space within the roof structure 1 into two regions.
  • the first, non- ventilated region extends between each adjacent pair of back battens 3 and between each adjacent pair of rafters 4.
  • the second, ventilated region extends between each pair of adjacent front battens 6.
  • a thermal insulation structure comprises three surfaces of low emissivity bordering an unventilated air space within a roof structure.
  • the first two surfaces of low emissivity are provided by a wads of multi-foil insulation material 9, such as that marketed under the trade mark "Thinsulex".
  • the ends of each wad are stapled to an adjacent pair of rafters 4 such that each wad of the material 9 extends the full distance between the rafters 4 and extends over the region between an adjacent pair of back battens 3.
  • the multi-foil insulation material 9 may be installed as a continuous sheet of material, rather than separate wads, and may be fixed in position at the ends of the rafters 4.
  • the material 9 separates the first, non- ventilated region of the air space, described above with reference to Figure 1, into two groups of sub-regions, the first group extending between adjacent pairs of back battens 3 and the second group extending between adjacent pairs of rafters 4.
  • a first surface of low emissivity (one side of the mutli-foil insulation material 9) faces the plasterboard 2 and a second surface of low emissivity (the other side of the multi-foil insulation material 9) faces a membrane 5.
  • the side of the membrane 5 facing the rafters 4 has a metallised surface 12, thereby providing a third surface of low emissivity.
  • the other side of the membrane 5 is not metallised and is attached to a series of parallel front battens 6 which in turn provide support for tiles 8.
  • a second embodiment of a thermal insulation structure incorporates the features of the first embodiment, except that the membrane 5 is not metallised, and a third surface of low emissivity is instead provided by foil-backed plasterboard or bubble wrap 14 which replaces the plasterboard of the first embodiment.
  • FIG 4 A perspective view of the second embodiment is shown in Figure 4, in which the multi- foil insulation material 9 can be seen extending into the air space formed between the rafters 4. Only a single wad of insulation material is shown for the sake of enhanced clarity but it may extend in a continuous sheet, lying across the end of each rafter and being attached thereto.
  • a third embodiment of a thermal insulation structure incorporates the features of the first embodiment of a thermal insulation structure, except that an additional pair of surfaces of low-emissivity are provided by a double-sided foil 16 suspended between each adjacent pair of rafters 4 at a position substantially mid- way between the front and back battens 6, 3.
  • the double-sided foil 16 thus separates the air space formed between the rafters 4 into two.
  • the multi-foil insulation material 9 and the double-sided foil 16 together provide four surfaces of low-emissivity next to an air space.
  • the membrane 5 has a metallised surface 12.
  • the plasterboard 2 is backed with foil 14 which faces the air space formed between each pair of back battens 3. This structure therefore provides six surfaces of low emissivity bordering an unventilated air space.
  • a fourth embodiment of a thermal insulation structure includes a layer of multi-foil insulation material 9 as in the embodiments described above, together with a double-sided foil 16 as in the third embodiment.
  • the air space is exaggerated in Figure 6 for the sake of clarity.
  • the plasterboard 2 is additionally backed with foil 14 which faces the air space formed between each pair of back battens 3 to provide a fifth surface of low emissivity.
  • a thermal insulation structure comprises a layer of multi-foil insulation material 9 as in the above- described embodiments.
  • Third and fourth surfaces of low emissivity are provided by the surfaces of a double-sided booster insulation 18 suspended between the rafters 4 at a position substantially midway between the front and back battens 6, 3.
  • the double-sided booster insulation 18 separates the air space formed between each adjacent pair of rafters 4 into two.
  • the multi-foil insulation 9 and the double-sided booster 18 insulation together provide four surfaces of low emissivity bordering air spaces.
  • the membrane 5 has a metallised surface 12, the plasterboard 2 is backed with foil 14 which faces the air space formed between each pair of back battens 3. This structure therefore provides six surfaces of low emissivity bordering unventilated air spaces.
  • a sixth embodiment of a thermal insulation structure comprises a layer of multi-foil insulation material 9.
  • further identical wads or a single continuous wad of multi-foil insulation material 10 is stapled to each one of the rafters 4 such that it extends the full distance between the rafters 4 and lies between an adjacent pair of front battens 6.
  • Additional vertical battens 24 may be positioned between the multi-foil insulation material 10 and the membrane 5 to provide an airspace between the two surfaces.
  • This structure provides four surfaces of low emissivity bordering unfilled air spaces, two of which oppose one another.
  • a fifth surface of low emissivity is provided by coating the plasterboard 2 with a layer of foil 14.
  • FIG. 9 A perspective view of the sixth embodiment is shown in Figure 9.
  • the opposing insulation material 9, 10 is shown, and may extend as previously described along the roof space fixed at the edges of the rafters 4.
  • a seventh embodiment of a thermal structure comprises first and second layers of multi-foil insulation material 9, 10, as in the sixth embodiment described above providing four surfaces of low emissivity.
  • double- sided booster insulation 18 is suspended between the rafters 4, and provides an additional two surfaces of low emissivity each bordering a respective air space.
  • This structure provides six surfaces of low emissivity bordering unfilled air spaces.
  • a seventh surface of low emissivity is provided by coating the plasterboard 2 with a layer of foil 14.
  • a polyurethane spacer 20 is shown to be attached between the insulation material 9 and the booster insulation 18.
  • An alternative spacer 22 is also shown in the drawing, although it is envisaged that there would normally be only a single type of spacer used in a given roof space.
  • a roof system includes:
  • This sample contains one 50 mm air space with low- and medium-emissivity surfaces, one multi-foil insulation product, one 100 mm air space with a medium- and a high- emissivity surface. If this system is built into a roof structure with exterior tiles, then the U value of the overall roof structure is 0.48 WAn 2 K. The air spaces make a significant contribution to the overall thermal resistance. Calculated Values
  • the emissivity of the outer layers of the ThinsulexTM surfaces is reduced to 0.2.
  • the U- value of this roof is 0.46 W/m 2 K, which has been improved by an amount of 0.02 simply by reducing the emissivity of the ThinsulexTM layer.
  • the calculated R- value is not simply a sum of the individual R-values due to the cold bridging effects of the wooden rafters and battens.
  • a foil-backed or aluminised breather membrane is introduced in the sample
  • the U-value is 0.34 W/m 2 K
  • the U-value is 0.39 WYm 2 K when a foil is introduced into the centre of the rafter space.
  • ThinsulexTM multi-foil insulation systems are applied above and below the rafter space and a two-sided foil inside the rafter space.
  • U 0.25 W/m K
  • ThinsulexTM multi-foil insulation systems are installed above and below the rafter space and 60 mm RockwoolTM mineral wool is positioned inside the rafter space. Specifically, the RockwoolTM mineral wool is not in contact with the ThinsulexTM multi-foil insulation but is spaced to retain the air layer.
  • This roof structure has a U-value of 0.20 WVm 2 K and satisfies the Building Regulations Part LlA 2006 for new-build dwellings.
  • ThinsulexTM multi-foil insulation systems are installed above and below the rafter space and 100 mm polyurethane foam is positioned inside the rafter space.
  • the rafters are 150 mm depth rafters in order to maintain the air layer intact.
  • This roof structure has a U-value of 0.14 WZm 2 K and satisfies the Building Regulations Part LlA 2006 for new-build dwellings.
  • Example 10 As previously described in Example 6 with the addition of two metallised foils across the rafter space. The U-value for this structure is 0.22 W/m 2 K. Example 10
  • the metallised coating on the membrane and/or the foil coating on the plasterboard may not be present, provided that the structure has at least three surfaces of low emissivity.
  • the ThinsulexTM multi-insulation material of the preferred embodiment may be replaced by any other suitable multi-insulation material.

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  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
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  • Acoustics & Sound (AREA)
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Abstract

L'invention concerne une structure d'isolation thermique pour un espace de toit qui comprend trois surfaces de faible émissivité adjacentes à des espaces d'air non ventilés dans une structure de toit (1). Deux surfaces de ce type sont réalisées par des bandes de matériau isolant multicouche (9) qui s'étendent entre des poutres adjacentes (4) et entre des liteaux arrière (3). Une première surface de faible émissivité d'un côté du matériau isolant (9) fait face aux plaques de plâtre (2) et une deuxième surface de faible émissivité de l'autre côté du matériau isolant (9) fait face à une série de liteaux avant parallèles (6) qui assurent le support des tuiles du toit. Une membrane (5) est fixée aux liteaux avant (6) et est disposée du côté tourné vers les poutres (4), avec une surface métallisée de faible émissivité (12). En variante, la membrane (5) n'est pas métallisée et une troisième surface de faible émissivité est réalisée avec des plaques de plâtre à revêtement de film ou avec un matériau d'enveloppe à bulles (2). Une paire supplémentaire de surfaces de faible émissivité peut être réalisée par un film double face suspendu entre les poutres (4). Une isolation supplémentaire peut en outre être fixée entre les poutres (4) s'étendant entre le film et la membrane (5), en remplissant sensiblement l'espace d'air. Des bandes supplémentaires de matériau isolant multicouche peuvent être agrafées entre les poutres (4) et entre les liteaux avant (6). Un dispositif d'espacement en polyuréthane peut être fixé entre le matériau isolant (9) et l'isolation supplémentaire.
PCT/GB2007/001029 2006-03-22 2007-03-22 Structures d'isolation thermique comprenant des espaces d'air et des surfaces de faible emissivite WO2007107767A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0605747.5 2006-03-22
GB0605747A GB0605747D0 (en) 2006-03-22 2006-03-22 Improvements in or relating to thermal insulation systems

Publications (1)

Publication Number Publication Date
WO2007107767A1 true WO2007107767A1 (fr) 2007-09-27

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GB (2) GB0605747D0 (fr)
WO (1) WO2007107767A1 (fr)

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CN103066143A (zh) * 2013-01-29 2013-04-24 江苏晨电太阳能光电科技有限公司 设有多层防护膜的保温型太阳能电池组件
CN103066142A (zh) * 2013-01-29 2013-04-24 江苏晨电太阳能光电科技有限公司 设有保温结构的太阳能电池组件

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EP1624121A2 (fr) * 2004-08-05 2006-02-08 Polyon Barkai Industries (1993) Ltd. Dispositif d'isolation et procédé de fabrication associé

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AU5245473A (en) * 1972-02-21 1974-08-22 United Packages Goic. ) Pty. I/To An expandable structure
US5918436A (en) * 1997-07-08 1999-07-06 Alderman; Robert J. Radiant barrier facing material
WO2001058683A1 (fr) * 2000-02-10 2001-08-16 Friedman, Mark, M. Structures isolantes reflechissantes souples
US20030129330A1 (en) * 2002-01-04 2003-07-10 Alderman Robert J. Cell insulation blanket with phase change material, and method of making
EP1624121A2 (fr) * 2004-08-05 2006-02-08 Polyon Barkai Industries (1993) Ltd. Dispositif d'isolation et procédé de fabrication associé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103066143A (zh) * 2013-01-29 2013-04-24 江苏晨电太阳能光电科技有限公司 设有多层防护膜的保温型太阳能电池组件
CN103066142A (zh) * 2013-01-29 2013-04-24 江苏晨电太阳能光电科技有限公司 设有保温结构的太阳能电池组件

Also Published As

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GB2436338B (en) 2009-07-01
GB0605747D0 (en) 2006-05-03
GB0705558D0 (en) 2007-05-02
GB2436338A (en) 2007-09-26

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