GB2140056A

GB2140056A - Seating flat roofs

Info

Publication number: GB2140056A
Application number: GB08330214A
Authority: GB
Inventors: Pierre Couderc; Jean-Pierre Monnier
Original assignee: IND DES STRATIFIES Ste
Current assignee: IND DES STRATIFIES Ste
Priority date: 1980-08-20
Filing date: 1983-11-11
Publication date: 1984-11-21
Also published as: GB2097033A; IT8123577A0; LU83563A1; DE3132625A1; GB2140056B; NL8103856A; GB8330214D0; IT1139402B; GB2097033B

Abstract

Damp-proofing sheets 30a-c are adhered only to the central area 23 of each of insulation panels 22 by means of a central area only of self-adhesive material. The area is initially covered with protective film. The use of spaced areas permits thermal expansion of the roof. <IMAGE>

Description

1 GB 2 140 056A 1

SPECIFICATION

Non-bearing rigid insulating panel adapted to carry a serni-independent damp-proofing roof structure This invention concerns non-bearing rigid insulating panels adapted to carry a semi-independent damp-proofing or water-proofing roof structure. The invention also concerns the process of laying a semi-independent damp- proofing or water-proofing roof structure using such panels, as well as insulated roofs, more specifically deck roofs, constructed by applying this process.

Various roofs, particularly deck roofs, are constructions with an external thermal isolation, comprising a rigid load-bearing structure such as a masonry structure, a vapour barrier, a nonbearing rigid. heat- insulating layer in the form of abutting panels on top of the vapour barrier, and finally a damp-proofing structure layer placed on this insulation.

The water-proofing or damp-proofing layer of an externally heat insulated roof of this type may be placed on the insulating layer in various ways: independently, by adhesion, or semi- 15 independently.

In independent laying, the damp-proofing material simply rests on the heat insulating panels, without being attached in any way. This method eliminates shearing stresses on the dampproofing layer resulting from hygro-thermal variations in the insulating material, but considerable weight of loading material then has to be placed on top of the dampproofing layer, such loading material usually consisting of a gravel layer having a thickness of four to six centimetres, and this requires a suitable load-bearing framework.

The adhesion method, in which the damp-proofing layer is fully glued to the rigid insulation, removes the need for extra weight, but shearing stresses resulting from hygrothermal variations in the insulating material may after a time cause deterioration of the damp-proofing layer.

In semi-independent laying, the damp-proofing layer is normally glued to the insulation at certain points, through a perforated screen, which is first laid on the insulation. This method overcomes the drawbacks of the independent and adhesion procedures, but it requires the special screen to be laid between the insulating and damp-proofing layers before gluing. This is not a simple operation, and requires additional labour, at considerable expense. The damp- proofing material may also be laid semi-independently without using a perforated screen, but results in this case are far less satisfactory, because of the difficulty of positioning properly sized gluing points evenly over the surface of the insulating panels, by hand, without a guide, and at reasonable cost.

This invention concerns non-bearing rigid roof-insulating panels adapted to carry damp- 35 proofing materials, for use in semi-independent laying of such materials on externally insulated roofs, and which over some all the drawbacks of previous methods used for this purpose.

More specifically, these novel roof-insulating panels can be used for semi-independent laying of damp-proofing materials by means of adhesive areas positioned uniformly in the centre of the insulating panels, all such areas being of uniform size, thereby considerably increasing the 40 durability and resistance of the damp-proofing layer to stresses resulting from hygrothermal variations, and to wind stress.

According to the invention, there is provided a novel rigid roofinsulating panel adapted to carry a damp-proofing layer, wherein one of the large panel surfaces comprises means, attached to this surface, of such a nature, and/or arranged in such a way, as to form a bond between the panel and the damp-proofing layer, through a single central adhesive area of uniform size.

In one embodiment of the invention, the said means may comprise an antiadhesive layer applied to the appropriate surface of the panel, in such a way as to leave a central portion of the surface uncovered, to provide the adhesive area.

Such an anti-adhesive layer may be formed either of a sheet of antiadhesive material, or of 50 material containing an anti-adhesive ingredient, with an opening in the centre, and which is glued to the surface of the panel, or of a film of anti-adhesive substance applied to the surface of the panel, in the form of a coating, possibly by roller, leaving the central area of the panel free of this substance.

The anti-adhesive substance used to form the anti-adhesive layer applied to the surface of the 55 panel, in the form of a sheet or coating, may be any anti-adhesive product known in the prior art, capable of withstanding temperatures of approximately 200 to 270'C, the usual tempera tures at which to glue damp-proofing (i.e. water-proofing) asphalts are applied. It is preferably a silicone, and the anti-adhesive layer on the surface of the panel is preferably a sheet or silicone- coated polymer, or silicone-coated paper, or a silicone coating, applied to the panel in the form 60 of an aqueous emulsion, for example.

The thickness of this anti-adhesive material may vary considerably but it preferably corre sponds to a quantity of anti-adhesive material ranging from 50 to 200 grams per square metre of surface covered. More specifically, when the anti-adhesive product is a silicone applied to the surface of the panel in the form of an aqueous emulsion, the quantity of emulsion applied 65 2 GB2140056A 2 corresponds to 50 to 200 grams of dry matter per square metre of surface covered.

In another embodiment of the invention, the means integral with, or attached to, the surface of the insulating panel may be formed of an asphalt-proof material, such as polymer sheeting or asphalt-proof kraft paper, glued to the centre of the panel by an adhesive area of uniform size, and the damp-proofing layer is glued to the outside surface of this asphalt-proof sheet, thereby 5 forming the semi-independent assembly of the panel and the damp-proofing layer.

The central area not covered with anti-adhesive product on the surface of a panel otherwise covered with a layer of such product, or the central adhesive areas forming the bond between the panel and the asphalt-proof sheet may be of any shape, but are preferably approximately regular, and more specifically approximately circular.

In yet another embodiment of the invention, the means attached to the surface of the insulating panel comprise a self-adhesive patch fixed approximately to the centre of the panel surface.

The exposed surface of this self-adhesive patch, namely the side not in contact with the panel, is preferably covered with a protective film, at least part of the surface of which in contact with 15 the patch is covered with anti-adhesive product. This protective film, which is removed when the damp-proofing layer is about to be placed in position on the site, may be made of siliconecoated or paraffin-coated paper, of the same shape and size as the exposed surface of the patch.

The patch may be of any shape, but is preferably regular, and its exposed surface should be more specifically regular, for example round, square or oblong.

The patch may be formed entirely of a substance with self-adhesive properties, or of a compressible porous backing impregnated with a selfadhesive product, or of a backing coated with a layer of self-adhesive product, the backing being in contact with the panel, and the surface of the self-adhesive layer facing away from the panel surface constituting the exposed surface of the patch.

Self-adhesive substances suitable for such a patch comprise products that will adhere by pressure at atmospheric temperature, that are compatible with damp-proofing materials, and that possess durable self-adhesive properties with respect to such materials, under temperature and humidity conditions prevailing in structures comprising insulation and dampproofing. For example, it may be a polymer-modified asphalt, such as an asphalt to which a butadiene-styrene 30 polymer has been added, or have an acrylic polymer or copolymer base.

In one embodiment, the self-adhesive patch is formed entirely of a polymer-modified asphalt. In another embodiment, the patch comprises a plastic foam backing impregnated with an acrylic polymer- or copolymerbased self-adhesive product.

The thickness of the patch may vary within wide limits, but it should be enough to ensure 35 overall adherence to the underside of the damp-proofing material, which usually has a gritty and slightly corrugated surface. The thickness of the patch may be comprised between 0.5 and 5 millimetres, and preferably betw, ' een 1 and 4 millimetres.

In these novel panels, the size of the central portion of the panel surface not covered with anti-adhesive, or occupied by the central adhesive area of uniform size forming a bond between 40 the asphalt-proof sheet and the insulation, or of the exposed surface of the self-adhesive patch, corresponds to between 2 and 30% of the total area of the panel surface containing the adhesive zone, and preferably between 4 and 16%.

The novel insulating panels, comprising either an anti-adhesive layer, central adhesive area or self-adhesive patch, provide heat insulation or heat and sound insulation. The material from which they are made may be a cellular plastic, such as polyurethane foam, phenolic foam, polyisocyanurate foam, polyvinyl chloride foam, or expanded polystyrene, more specifically moulded or extruded expanded polystyrene, or a product such as expanded cork, lignocellulose, with or without perlite added to it, cellular glass, or mineral fibre. Panels may also comprise reinforcement and/or one or two facings.

The side of the novel insulating panels opposite the surface provided with the anti-adhesive layer, central adhesive area or self-adhesive patch may also comprise a self-adhesive coating over at least part of its surface, and more specifically over the whole surface; this coating is of the same kind as the self-adhesive patch, and is similarly protected by an anti-adhesive film.

The panel may be made by any method known in the prior art. The antiadhesive layer, central adhesive area combined with the.asphalt-proof sheet, or self- adhesive patch, are applied to the panel surface, preferably during production, on production equipment, by including an additional production step, during which the anti-adhesive layer, central adhesive area combined with the asphalt-proof sheet, or self-adhesive patch, are added to the panel. However, this operation can also be performed on individual panels after continuous or batch cutting-out of 60 panels from moulded blocks, or even during the laying of the dampproofing layer or structure on the building site.

When a self-adhesive patch is used, it is attached to the surface of the panel by any suitable means that will ensure a proper bond between the patch and the panel. For example, a self adhesive method may be employed, using the self-adhesive properties of the patch itself, or it 65 4 3 GB 2 140 056A 3 may be glued on with a suitable adhesive, or it may even be attached with mechanical devices, such as staples, screws or nails. More specifically, and particularly when the self-adhesive path is attached to the panel during production, hot asphalt is used as adhesive.

The water-proofing or damp-proofing layer or structure laid semiindependently on these new insulating panels is generally an asphalt-based material, as known in the prior art, such as 5 asphalt sheeting reinforced with glass-fibre mesh or jute fabric, and more specifically sheet of mixed asphalt and elastomer reinforced with a glass-fibr.e mesh.

When the novel insulating panels comprise an anti-adhesive layer or central adhesive area combined with an asphalt-proof sheet, the adhesive used to bond the panels and the damp proofing, or the damp-proofing and the asphalt -proof sheet on the panels, may be any adhesive 10 normally used for such purposes, more specifically gluing asphalts, such as blown asphalts, commonly used in gluing damp-proofing materials.

Semi-independent laying of a damp-proofing layer on an externally insulated roof, using the novel panels, comprises the following steps:

First, the non-bearing insulating panels are fixed edge to edge, and preferably in a staggered 15 arrangement, on the load-bearing structure, with or without a vapour barrier, so that the surface of the panels containing the anti-adhesive layer, the central adhesive area combined with the asphalt-proof sheet, or the self-adhesive patch, faces away from the framework. The panels may be fixed to the structure by overall gluing, using a hot adhesive. If the panels have a self- adhesive layer on the inner surface. this will adhere to the vapour barrier on the framework, without the need for any hot coating. The surface formed by the juxtaposed insulating panels forms the surface on which the damp-proofing material is laid semi-independently. In the second phase, the protective film is removed from the self-adhesive patches on the juxtaposed panels, or adhesive, for example a molten blown asphalt, is applied to the surface of insulating panels coated with an anti-adhesive layer, or to the asphalt-proof sheets fixed to the panels, and the 25 damp-proofing material is unrolled on top of the insulation surface with its adhesive areas or self-adhesive patches, and pressure is applied to improve adherence.

In one recommended embodiment of panels with a self-adhesive patch, the first layer or damp-proofing material, immediately after being laid, is pressed down with a garden-roller-type appliance, which is rolled over the whole surface of the material. This further improves the initial 30 adherence of the material to the self- adhesive patches on the panels.

The strips of damp-proofing material, for example asphalt sheets reinforced with glass-fibre mesh, or sheets or mixed asphalt and elastomer reinforced with glass-fibre mesh, are usually made to overlap slightly, to ensure that there are no breaks in the damp-proofing layer. The overlapping edges of adjacent strips are then welded. Several superimposed damp-proofing layers are usually glued to one another to ensure the required degree of damp-proofing. In this case, the second and subsequent strips are glued overall, and laid criss-cross or with staggered joins on top of the underlying strips.

The following descriptions of some of the possible embodiments of the new roof-insulating panels specifies their use in semi-independent laying of damp-proofing materials, with reference 40 to the accompanying illustrations, where:

Figure 1 is a view in perspective of an insulating panel, with an antiadhesive layer.

Figure 2 is a cross-sectional view in perspective, taken along a lengthwise median plane of the panel, comprising an asphalt-proof sheet bonded to the panel by a central adhesive area.

Figure 3 is a diagrammatic view showing the first damp-proofing layer being placed on 45 insulation formed of the panels shown in Fig. 1.

Figure 4 is a semi-cross-sectional view taken along a lengthwise median plane and a crosswise median plane, and in perspective, a panel with a self-adhesive central patch; and Figure 5 is a diagrammatical view, wherein the first layer of damp- proofing is placed on an insulation formed of the panels shown in Fig. 4.

Fig. 1 shows a non-bearing rigid roof-insulating panel 1, made from rigid polyunrethane foam, in the form of a rectangle 80 cm long and 50 cm wide. On one of the large sides of this panel there is an anti-adhesive silicone coating 2, which leave a circular central area 3, approximately 20 cm in diameter, free of silicone coating. This silicone coating is placed on the panel surface during production. A roller is used to apply an aqeuous silicone emulsion to the 55 panel, leaving a 20 cm-diameter area in the centre of the surface free of silicone. The quantity of emulsion applied represents 140 grams dry content per square metre of surface covered.

Gluing asphalt is applied to the silicone-free central area, to hold the water-proofing or damp proofing structure or layer semi-independently on the insulating panels.

Fig. 2 shows an insulating panel 4 made from rigid plastic foam, such as polyurethane, 60 rectangular in shape, with approximately the same dimensions as the panel in Fig. 1. An asphalt-proof sheet 5, such as a sheet of asphalt-proof kraft paper, is glued to one of the large surfaces of the this panel by means of a central area 6 provided with asphalt. This central area is approximately circular, and about 25 cm in diameter. The damp-proofing material is glued to the surface of the asphalt-proof sheet facing away from the panel, and the central area 4 GB 2 140 056A 4 constitutes the bond of the semi-independent assembly of the dampproofing and insulation layers.

Fig. 3 illustrates the method of laying the damp-proofing material. Rigid non-bearing roof insulating panels 7a to 7c and 8a to 8d of the type illustrated in Fig. 1, and each consisting of a panel 1, one of the large sides or surfaces of which has an anti-adhesive coating 2 and a central 5 area 3 free of such coating, are fixed edge to edge, and in a staggered arrangement, on a bearing masonry structure 9, in such a way that the uncoated side of each panel is in contact with this structure. Molten asphalt is applied to the surface of each panel which has a central area 3 free of anti-adhesive coating. The damp-proofing strips 1 Oa to 1 Oc are then unrolled on top of the juxtaposed panels, and glued to them by means of the gluing asphalt inside the central areas 3. This is done by unrolling the first strip 1 Oa in the direction shown by the arrow, on the part of the insulation to be covered by this strip, consisting of part of three panels 8a, 8b and 7a, and pressing it to make it adhere. The second strip 1 Ob is then unrolled, again in t he direction shown by the arrow, in order to lay it alongside the first strip, taking care to ensure that the lengthwise edge 11 a of the first strip is overlapped by the matching edge 1 2b of the second strip. The second strip is then made to adhere to the insulation, by means of the areas of gluing asphalt on the panels covered by this strip. The third strip 1 Oc is then unrolled and glued to the insulation in the same way, in other words with an overlap between the lengthwise edge 11 b of the second strip and the matching lengthwise edge 1 2c of the third strip. This procedure continues until the whole damp-proofing layer or structure has been placed in position on the 20 roof. The lengthwise edge of each strip, such as the edge 1 2b of the second strip 1 Ob, covering the matching edge 11 a of the adjacent strip 1 Oa, is welded to the underlying strip by heating the asphalt with a blow-lamp until the asphalt melts. When one damp- proofing layer has been placed in position in this way, it can be covered with one or more additional layers, until the required level of damp-proofing has been achieved. The second and subsequent layers are laid 25 criss-cross or with staggered joins, and glued overall to the respective underlying layer.

Fig. 4 shows an insulating panel 21 made from polyurethane foam, in the form of a rectangular parallelepiped, 80 Cm long, 60 cm wide, and 6 cm thick. A self-adhesive patch 23, similarly parallelepiped-shaped, is glued with asphalt to one of the large surfaces 22 of the panel. The exposed surface of this patch is rectangular, the centre of the patch coincides with 30 the centre of the surface 22, and the sides are parallel to the corresponding sides of the panel.

The length and width of the rectangular exposed surface of the patch are preferably in the same ratio to each other as the length and width of the panel surface 22, and in this case are therefore 30 cm and 22.5 cm, although these ratios may of course be different from each other.

The patch is 1.5 mm thick, formed entirely of a self-adhesive substance, such as a plasticized asphalt with self-adhesive properties. The exposed surface is covered with an anti-adhesive protective film 24 of silicone-coated paper. In the illustration, this film is shown partly removed.

Fig. 5 shows furthermore the procedure for laying the damp-proofing material. Rigid non bearing roof-insulating panels 27a to 27c, 23a to 28d of the type shown in Fig. 4, and each consisting of a panel 21, one of the larger sides 22 of which has a rectangular self-adhesive patch 23, the anti-adhesive protective film 24 of which has been removed, are fixed edge to edge, and in a staggered arrangement, on a masonry bearing structure 26, in such a way that the self-adhesive patches face away from this structure. The damp- proofing strips 30a and 30c are then unrolled on top of the juxtaposed panels, and glued to them by means of the self adhesive patches. This is done by unrolling the first strip 30a in the direction shown by the 45 arrow, on the part of the insulation to be covered by this strip, consisting of part of three panels 28a, 28b and 27a and pressing it to make to adhere. The second strip 30b is then unrolled, again in the direction of the arrow, in order to align it with the first strip, taking care to ensure that the lengthwise edge 1 3a of the first strip is overlapped by the match edge 32b of the second strip, which is glued to the insulation layer by means of the self- adhesive patches in the 50 middle of each panel. The third strip 30c is then unrolled and glued to the insulation by means of the self-adhesive patches in the middle of the panels covered by this strip, following the same procedure as for the second strip, in other words with an overlap between the lengthwise edge 31 b of the second strip and the matching lengthwise edge 32c of the third strip. This procedure continues until the whole damp-proofing layer has been placed in position on the roof. The lengthwise edge of each strip, such as the edge 32b of the second strip 30b, covering the matching edge 31 a of the adjacent strip 30a, is welded to the underlying strip by heating the asphalt with a blowlamp, until it melts and adheres. When the first complete layer of damp proofing is in position, it is pressed with a roller similar to a garden roller, which is moved over the damp-proofing strips in such a way that it presses on every part of the roof surface. This first 60 layer can then be covered with one or more other layers of damp-proofing strips until the required degree of damp-proofing is achieved. The second and subsequent layers are laid crisscross or with staggered joins on top of the previous layer, and glued overall to it.

Use of these new panels to carry the damp-proofing layer in a semiindependent damp- proofing structure makes it possible, because of the presence on the surface of the panel facing 65 Z Z4 GB2140056A 5 the damp-proofing layer of means of forming a bond between the damp- proofing and the panel through a single central adhesive area of uniform size, to glue the damp- proofing material to the panels by means of properly positioned and regularly sized areas of adhesive, without the need for any particular precautions, and without the need on the site to unroll a perforated screen to provide a guide in positioning and sizing such areas, or to produce and position adhesive areas 5 through a glass-fibre mesh.

Use of the panels illustrated in Fig. 4 also eliminates the need to handle large quantities of asphalt or other adhesives on the site.

A damp-proofing layer laid on the type of panels illustrated in Fig. 4 has been tested, to show the level of adherence of the damp-proof ing material on the insulation. This was done by pulling 10 in a direction perpendicular to the adhesive plane, using samples simulating the assembly of damp-proofing and insulation on a roof.

Each of these samples consisted of a sandwich assembly, comprising:

a-a square sheet of polyurethane insulation similar to the type shown in Fig. 4, measuring 10 cm X 10 cm, and 6 cm thick; b-a self-adhesive patch, formed entirely of a self-adhesive plasticized asphalt marketed by the Firm Guttaterna under the trade name---GuttaBand-- -; this patch was 1.5 mm thick, and covered all of one of the large sides of the sheet; c-a square piece of damp-proof ing material, measuring 10 X 10 cm, and attached to the insulation by means of the self-adhesive patch.

DESCRIPTION OF TESTING PROCEDURE

Each of the large sides of the sample was glued to a flat, rigid plate; these plates were parallel, one being fixed and the other movable.

The movable plate was moved away from the fixed plate, in a direction perpendicular to the 25 plates, the pulling force being increased gradually until the sample disintegrated.

Adherence in resistance to perpendicular traction was defined as the breaking force per unit of surface area of the sample.

The following results were obtained:

-adherence at 20T before rolling -adherence at 2WC after rolling adherence at 20C after three heating cycles ( - 1 OC to + WC) 0.4 bars 1. 1 bars 1.2 bars Breakage occurred in the self-adhesive patch in all tests.

These results show that adherence after the heating cycles is sufficient to ensure that damp proofing materials laid on an externally insulated roof using these new panels will withstand wind forces.

Naturally, the invention is in no way confined to the embodiments described above: many 40 alternative forms are possible for someone skilled in the art, without any departure from the spirit of the invention.

Claims

CLAIMS 1. A rigid roof-insulating panel adapted to carry a damp-proofing

roof structure, wherein one 45 of the large surfaces of said panel comprises a self-adhesive patch, fixed to a central zone of this surface, and of such a nature and/or arranged in such a way on the surface as to form a bond between the panel and the damp-proofing layer.
2. A panel as defined in Claim 1, in which the exposed surface of the self-adhesive patch is covered with a protective film, at least the surface portion of which which is in contact with the 50 patch is covered with an anti-adhesive product.
3. A panel as defined in Claims 1 or 2, in which the self-adhesive patch is formed entirely of a self-adhesive substance.
4. A panel as defined in Claims 1 or 2, in which the self-adhesive patch comprises a compressible porous backing, such as foam plastic, impregnated with a self-adhesive product. 55
5. A panel as defined in Claims 1 or 2, in which the self-adhesive patch comprises a backing coated with a layer of self-adhesive product, the backing being in contact with the panel surface, and the surface of the self-adhesive layer facing away from the panel surface constituting the exposed surface of the patch.
6. A panel as defined in any one of Claims 1 to 5, in which the selfadhesive patch has a 60 thickness comprised between 0.5 and 5 millimetres, and preferably between 1 and 3 millimetres.
7. A panel as defined in any one of Claims 1 to 6, forming a rectangular parallelepiped, and in which the self-adhesive patch also forms substantially a rectangular parallelepiped, while the centre of the exposed surface of this patch, which is also rectangular, coincides with the centre 65 6 GB2140056A of the panel surface which carries said patch, the sides of said parallelepiped being parallel to the corresponding sides of the panel, and the length and width ratio of the rectangular patch preferably being equal to the length and width ratio of the panel surface.
8. A panel as defined in any one of Claims 2 to 7, in which the size of the free surface of the self-adhesive patch, corresponds to between 2 and 30% of the total area of the panel surface containing the adhesive zone, and preferably between 4 and 16%.
9. A panel as defined in any one of Claims 1 to 8, which is made from cellular plastic, more specifically polyurethane foam, phenolic foam, polyvinyl chloride foam, po lyisocyan u rate foam, or expanded polystyrene, or from a product such as expanded cork, lignocellulose, with or without perlite added to it, cellular glass, or mineral fibre.
10. A panel as defined in any of one of Claims 1 to 9, in which the surface opposite the surface facing the damp-proofing comprises a self-adhesive coating over at least part of its surface, this coating being protected by an anti-adhesive film.
11. A process of laying a damp-proofing material on a roof, in which panels of the type defined in any one of claims 1 to 10 are laid edge-to-edge, preferably in a staggered arrangement, on a load-bearing structure with or without a vapour barrier, so that the surface of the panels containing the means of bonding the panel to the damp-proofing material only in an adhesive area of uniform size facing away from the structure, and in which, after the protective film covering each self-adhesive patch has been removed, the damp-proofing material is unrolled 45 on top of the insulation surface provided with self-adhesive patches, and pressure is exerted to 45 improve its adherence.

Printed in the United Kingdom for Her Majesty's Stationery Office, Dd 8818935, 1984, 4235. Published at The Patent Office, 25 Southampton Buildings, London. WC2A 1 AY, from which copies may be obtained.

4 j1

11. A process of laying a semi-independent damp-proofing structure on a roof, in which panels of the type defined in any one of Claims 1 to 10 are laid edge-to- edge, preferably in a staggered arrangement, on a load-bearing structure without without a vapour barrier, so that the surface of the panels containing the means of bonding the panel to the damp-proofing material only in an adhesive area of uniform size faces away from the structure, and in which, after the protective film covering each self-adhesive patch has been removed, the damp-proofing material.

is unrolled on top of the insulation surface provided with self-adhesive patches, and pressure is 20 exerted to improve its adherence.

12. A process as defined in Claim 11, in which, immediately after being laid, a first layer of damp-proofing material is pressed with a roller, which is displaced in such a way as to ensure that the whole surface of the damp-proofing layer is subjected to the action of said roller during its displacement.

13. A process as defined in Claims 11 and 12, in which panels as defined in Claim 10 are fixed to a vapour barrier on the load-bearing structure by means of a self-adhesive coating on the surface opposite the surface facing the damp-proofing material, after an anti-adhesive protective film has been removed from this coating.

14. An insulated roof, more specifically a deck roof, resulting from implementation of the 30 process defined in any one of Claims 11 to 13.

A CLAIMS 1. A rigid roof-insulating panel having on one of its large surfaces a self-adhesive patch confined to a central zone of this surface and occupying from 2 to 30% of the total of said 35 surface.

8. A panel as defined in any one of claims 1 to 7, in which the selfadhesive patch occupies from 4 to 16% of the total area of said surface.