FR3026046B1 - ROOF SCREEN - Google Patents

Abstract

The invention relates to an under-roof screen (50) successively comprising: a first layer (102) made of a first metallic or metallized material forming a thermal reflection barrier; a second layer (106) made of a third insulating material. and a third layer (108) made of a fourth metallic or metallized material forming a thermal reflection barrier, the under-roofing screen (50) further comprising at least a fourth layer (114) made of a fourth material containing phase change materials (PCMs) disposed against one and / or other of the faces of the second layer (106).

Description

The present invention relates to an under-roof screen.

The patent application EP-07-725903 discloses an under-roof screen which comprises: a first layer made of a first material forming a thermal reflection barrier; a second layer made of a second material woven and glued to the first layer; a third layer made of a third insulating material and bonded to the second layer, and a fourth layer made of a fourth material forming a thermal reflection barrier and bonded to the third layer.

The first layer and the second layer are provided with micro-perforations ensuring permeability to water vapor and impermeability to water.

The fourth layer is provided with perforations ensuring permeability to water vapor.

Although the thermal characteristics of this under-roof screen are particularly interesting, they can still be improved.

An object of the present invention is to provide an under-roof screen which does not have the drawbacks of the prior art. For this purpose, an under-roof screen is proposed successively comprising: a first layer made of a first metallic or metallized material forming a thermal reflection barrier, a second layer made of a third insulating material, and a third layer made of in a fourth metallic or metallized material forming a thermal reflection barrier, the under-roof screen further comprising at least a fourth layer made of a fourth material containing phase change materials arranged against one and / or the other faces of the second layer.

Advantageously, the under-roofing screen comprises between the first layer and the second layer or between the first layer and the fourth layer when it is present, a fifth layer made of a fifth woven material.

Advantageously, the first layer and the fifth layer are provided with micro-perforations ensuring permeability to water vapor and impermeability to water and the third layer is provided with perforations ensuring permeability to water vapor.

Advantageously, the sub-roofing screen comprises a breathable layer made of breathable and waterproof material and disposed between the fifth layer and the second layer or between the fifth layer and the fourth layer when it exists.

Advantageously, the under-roof screen comprises a layer made of swelling clay and disposed between the first layer and the fifth layer.

Advantageously, the under-roof screen comprises a layer made of swelling clay, the fifth layer is hydrophobic, and said layer is disposed between the fifth layer and the second layer or between the fifth layer and the fourth layer when it exists.

Advantageously, the or each fourth layer is discontinuous.

The characteristics of the invention mentioned above, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in connection with the attached drawings, among which: FIG. . 1 is a sectional view of a roof underlay according to a first embodiment of the invention, FIG. 2 is a sectional view of a roof underlay according to a second embodiment of the invention, FIG. 3 is a cross-sectional view of an under-roof screen according to a third embodiment of the invention, FIG. 4 is a sectional view of an under-roof screen according to a fourth embodiment of the invention, and FIG. 5 is a sectional view of an under-roof screen according to a fifth embodiment of the invention.

Fig. 1 represents an under-roof screen 50 according to a first embodiment of the invention and it comprises successively: a first layer 102 made of a first metallic or metallized material forming a thermal reflection barrier, a second layer made of a second insulating material, and - a third layer 108 made of a third metallic or metallized material forming a thermal reflection barrier. The sub-roofing screen 50 also comprises at least a fourth layer 114 made of a fourth material containing phase-change materials (PCM) and which is deposited between the first layer 102 and the second layer 106 and / or between the second layer 106 and the third layer 108.

In the embodiment of the invention shown in FIG. 1, there is a fourth layer 114 on either side of the second layer 106, but there could be a single fourth layer 114 disposed against one and / or the other of the faces of the second layer 106.

The thermal characteristics of the under-roof screen 50 are thus improved by the presence of MCPs which allow a better regulation of the temperature around their phase change temperatures.

The MCPs make it possible to slow down the heating of the third layer 108 by absorbing the heat and thus maintain the third layer 108 at a temperature close to the change of state temperature of the MCP which is preferably between 15 ° C. and 40 ° C. .

When placing the under-roof screen 50 under a roof of a building, the first layer 102 is oriented towards the roof, that is to say towards the outside of the building, while the third layer 108 is oriented towards the interior of the building.

The first layer 102 serves as a thermal reflective barrier to the external heat wanting to enter the building and is made for example of aluminum, or aluminized material.

The third layer 108 serves as a thermal reflective barrier to the inner heat wanting to leave the building and is made for example of aluminum, or aluminized material.

The second layer 106 serves, inter alia, thermal insulation between the first layer 102 and the third layer 108 and thus avoids the creation of thermal bridge. According to a particular embodiment, the second layer 106 is a non-woven fiberglass mat.

The fourth layer or layers 114 consist, for example, of a binder, such as, for example, an aqueous styrene-acrylate binder, and of MCP, for example paraffin microcapsules, dispersed in the binder. The adhesion of the different layers together is preferably ensured by bonding except the fourth layer or layers 114 which are preferably deposited by coating.

Fig. 2 shows an under-roof screen 100 according to a second embodiment which is a variant of the first embodiment. The sub-roofing screen 100 comprises between the first layer 102 and the second layer 106 or between the first layer 102 and the fourth layer 114 when it is present, a fifth layer 104 made of a fifth woven material.

The fifth layer 104 is a material which, because of its weave, has a high resistance to tearing and thus makes it possible to make the under-roofing screen 100 more resistant. The more resistant structure of the under-roofing screen 100 allows , then, its implementation on rafters separated by 90 cm. According to a particular embodiment, the fifth layer 104 is made of woven glass fibers and the diameter of the glass fibers is about 6 μm to 20 μm.

The water vapor that forms at the rear of the first layer 102, that is to say towards the interior of the building, must be evacuated towards the front of the first layer 102, that is to say say towards the outside of the building. For this purpose, the first layer 102 and the fifth layer 104 are provided with micro-perforations 110 which thus ensure permeability to water vapor and impermeability to water. The micro-perforations 110 have a diameter of the order of 50 μm but may vary from 10 μm to 200 μm.

To allow evacuation of the water vapor that forms inside the building, the third layer 108 is provided with perforations 112 providing permeability to water vapor. The perforations 112 may have a diameter greater than or equal to that of the micro-perforations 110 because they play no role in the impermeability of the underlayer screen 100 with respect to the water coming from outside the first layer 102. The perforations 112 have a diameter of the order of 50 pm to 150 pm.

Fig. 3 shows an under-roof screen 200, according to a third embodiment which is a variant of the second embodiment.

In order to further reinforce the tightness and permeance of the under-roof screen 200, it comprises a breathable layer 202 made of a breathable and waterproof material. The breathable layer 202 is disposed between the fifth layer 104 and the second layer 106 or between the fifth layer 104 and the fourth layer 114 when it exists. The breathable material may be of the polyethylene or polypropylene type or a mixture of these products with a mineral filler or else a breathable, waterproof thermoplastic. According to a particular embodiment, the thickness of the breathable layer 202 is between 10pm and 50pm. This breathable layer 202 may be made by hot coating or by stretching to produce a network of micro-channels passing water vapor.

The breathable layer 202 is preferably fixed by gluing, for example when it is made by stretching.

Fig. 4 shows an under-roof screen 300, according to a fourth embodiment which is a variant of the second embodiment.

In order to further reinforce the tightness and permeance of the under-roof screen 300, it comprises a layer 302 made of swelling clay. The layer 302 is disposed between the first layer 102 and the fifth layer 104. The swelling clay is applied by coating to the first layer 102 or the fifth layer 104. The diameter of the micro-perforations 110 is thus controlled because the particles of swelling clay are deposited in the micro-perforations 110 and in contact with water, they swell thus significantly reducing the diameter of the micro-perforations 110 and thus ensuring a better seal.

Fig. 5 shows an under-roof screen 400, according to a fifth embodiment which is a variant of the second embodiment.

In order to further reinforce the tightness and permeance of the under-roof screen 400, it comprises a layer 402 made of swelling clay and the fifth layer 104 is treated to be hydrophobic. The layer 402 is disposed between the fifth layer 104 and the second layer 106 or between the fifth layer 104 and the fourth layer 114 when the latter exists. The swelling clay is applied by coating on the fifth layer 104 or the second layer 106. As before, the diameter of the micro-perforations 110 is thus controlled because of the presence of swelling clay particles.

In the embodiments of FIG. 4 and FIG. 5, the thickness of the swelling clay layer 302, 402 is dimensioned so that the water vapor can pass through it without the runoff being able to enter.

To facilitate the passage of air and water vapor and facilitate the folding or rolling of the under-roof screen 50, 100, 200, 300, 400, the or each fourth layer 114 is discontinuous, by example by a discontinuous coating. The binder with the MCP is deposited in packets remote from each other, leaving a free space between each of them. The packets are, for example, deposits aligned in a matrix, each deposit taking the form of a square approximately 0.8 cm long, 1.5 mm thick and distant from its neighbors by approximately 1 mm.

The bonding of the various layers 102, 104, 106, 108 to one another can be carried out by heat-sealing. For example, polyethylene may be used to form the adhesive between the different layers 102, 104, 106, 108.

Of course, the present invention is not limited to the examples and embodiments described and shown, but it is capable of many variants accessible to those skilled in the art.

Claims (3)

CLAIMS 1) Under-roof screen (300) comprising successively: a first layer (102) made of a first metallic or metallized material forming a thermal reflection barrier and provided with micro-perforations (110) ensuring the permeability to the vapor; water and impermeability to water, a fifth layer (104) made of a fifth woven material and provided with micro-perforations (110) providing water vapor permeance and water impermeability - a second layer (106) made of a third insulating material, and - a third layer (108) made of a fourth metallic or metallized material forming a thermal reflection barrier and provided with perforations (112) ensuring permeability to vapor of water, the under-roof screen (300) further comprising: - at least a fourth layer (114) made of a fourth material containing phase-change materials (PCM) arranged contra e and / or the other side of the second layer (106)), and - a layer (302) made of swelling clay and disposed between the first layer (102) and the fifth layer (104). 2) under-roof screen (400) comprising successively: a first layer (102) made of a first metallic or metallized material forming a thermal reflection barrier and provided with microperforations (110) ensuring permeability to water vapor and the impermeability to water, - a fifth layer (104) made of a fifth hydrophobic woven material and provided with micro-perforations (110) providing water vapor permeability and impermeability to water, a second layer (106) made of a second insulating material, and - a third layer (108) made of a third metallic or metallized material forming a thermal reflection barrier and provided with perforations (112) ensuring the vapor permeance of water, the under-roof screen (400) further comprising: - at least one fourth layer (114) made of a fourth material containing phase change materials (PCM) arranged against one and / or the other of the faces of the second layer (106), and - a layer (402) made of swelling clay, and disposed between the fifth layer (104) and the second layer (106) or between the fifth layer (104) and the fourth layer (114) when present. 3) under-roof screen (300, 400) according to one of claims 1 or 2, characterized in that the or each fourth layer (114) is discontinuous.