EP0102901B1 - Insulating and impervious roof covering - Google Patents

Description

Sealing and insulation are properties that are increasingly sought after in the construction of roofs, and in particular the roofing of industrial buildings. Unfortunately, these buildings are very often covered with corrugated sheets and in particular asbestos-cement sheets, so that the maintenance of the roof, and even its installation or that of an insulating coating, raise safety problems in reason, either of the fragility of the plates, or of the difficulty for the personnel to move on a wavy surface.

It is known from US-A 4064663 to reinforce with a lattice frame or the like the foam insulation material of a shelter, but this lattice is interposed between the layers of a material which rests on the outer surface of the fabric constituting the shelter and follows the shape of this roof

et compliquée.It is also known from DE-A 2613 157 to coat an insulating foam material of corrugated roofing sheets by previously bonding to the ridges. wave sheet sheet, continuous or in strips, which covers the wave troughs and on which the foam material is applied which thus adheres to this sheet and possibly to the wave crests. The abtenued surface is flat but the installation is

and complicated.

The object of the present invention is to remedy drawbacks by providing a coating: an easy-to-produce cover which has sufficient strength to support the personnel performing or maintaining it, as well as a flat surface whatever the support on which it is placed.

The subject of this invention is in fact an insulating and waterproof covering coating produced in situ which comprises a plate of foam material, flat and of substantially constant thickness, this plate adhering to a support along spaced lines DE-A-2613157, characterized in that the plate is made of a foam material which solidifies almost instantaneously and adheres directly and only to protrusions of the support forming said spaced lines and in that a reinforcement and stiffening reinforcement having sufficiently fine meshes to retain most of the foaming product, still in the liquid state, until it solidifies, is embedded in the plate.

Depending on the building for which the covering is intended, the support may consist of corrugated plates already placed on the roof, the sheet of foam material adhering to the crests of the corrugations of these sheets, or be fixed directly to the purlins, or the like. elements of the roof.

In all cases, the coating allows safe circulation by maintenance or execution personnel, the reinforcement ensuring both a flat external surface and sufficient mechanical resistance.

According to one embodiment, the frame comprises two plies: a lower ply with fine meshes for retaining the foam material and stiffening the plate, and an upper ply with wide meshes ensuring the mechanical strength of the assembly.

The invention also extends to a method of manufacturing this roof covering, characterized in that it consists in placing a flat and taut reinforcement, having meshes sufficiently fine to retain the major part of a foaming product still at liquid state until solidification, on a fixed support comprising projections forming spaced and parallel lines between them, and depositing on this frame a foaming, liquid product, which solidifies almost instantaneously by adhering only and directly to the projections of the support after wetting the underside of the frame, and swells around the latter to form a flat plate.

A waterproof and insulating coating is thus obtained, which can be executed and maintained in complete safety, and which can be formed on a building under construction as well as being adapted on an existing building, in particular for transforming a corrugated roof into a surface roof. plane.

• la fig. 1 est une vue en perspective, arrachée, d'une portion de revêtement de couverture selon l'invention;
• la fig. 2 est une vue en coupe verticale, suivant la ligne 2-2 de la fig. 1;
• la fig. 3 est une vue analogue à la fig. 2, d'une variante de réalisation;
• la fig. 4 est une vue analogue à la fig. 2, d'un revêtement de couverture posé directement sur les pannes de la toiture.

The description below of an embodiment given by way of nonlimiting example, and represented in the accompanying drawings, will moreover highlight the advantages and characteristics of the invention. In these drawings:

• fig. 1 is a perspective view, cut away, of a portion of covering covering according to the invention;
• fig. 2 is a view in vertical section, along line 2-2 of FIG. 1;
• fig. 3 is a view similar to FIG. 2, of an alternative embodiment;
• fig. 4 is a view similar to FIG. 2, a covering covering placed directly on the purlins of the roof.

As shown in fig. 1, the covering covering object of the invention comprises corrugated plates 1, which are fixed in the usual way on purlins, but the fixing of which has not been shown so as not to complicate the drawing. On the ridges 2 of these corrugated plates is placed a reinforcing ply 4 which is formed, for example, by a lattice, a grid, expanded metal, or even a glass cloth. This ply has relatively small meshes, for example square meshes with a side of 6 mm, and it is stretched so as to be strictly flat.

Above the ply 4 is placed a second ply 6 having large meshes, for example square meshes with a side of 10 cm. This second layer consists, for example, of welded mesh plates, expanded metal, a perforated sheet. a grid, a grating, ribbed or not, a piastic net or others, with great mechanical resistance.

The two plies 4 and 6 are embedded in a foam material 8, which adheres to the ridges 2 of the corrugated plate 1, and constitute a reinforcement of this material. The foaming product is, for example, a polyurethane, a polycarbonate, a polyurea, having good qualities of adhesion to the support 1 and capable of solidifying very quickly around the sheets 4 and 6 by presenting an exterior surface 9 which is really flat. .

This coating according to the invention is also formed on site. After the corrugated plates 1 have been fixed to the purlins 20, the fine-mesh ply 4 is first placed on the ridges 2 of the plate 1 and stretched so as to form a strictly flat surface, then the second ply 6 is placed on the first and the foaming product, in the liquid state, is deposited on the two layers. This product solidifies almost instantaneously, in fact in two or three seconds, so that it solidifies before having had time to reach the valleys 10 of the waves of the corrugated plate 1, and only forms in- below the tablecloth 4 a thin layer 12 (fig. 2) which adheres closely to the vertices 2 of the ridges of the plate 1.

Of course, the fine meshes of the sheet 4 are large enough to allow part of the liquid to pass through them before solidification occurs, but nevertheless small enough to limit this penetration of the liquid into the thin layer 12 and prevent the liquid to flow freely towards the troughs of wave 10. These meshes must have between 5 and 20 mm. An air space or pocket 21 is then left free in each wave trough, between the plate 1 and the reinforced foam 8 of the coating, which improves the insulation coefficient.

The dimensions of the meshes of the second ply 6, as well as the material which constitutes this ply, are chosen so as to give the latter a high mechanical resistance, so that it is capable of supporting relatively high loads and in particular a operating or maintenance personnel.

The coating obtained thus ensures not only the waterproof and insulating covering of the roof, but also the safety of the personnel who installs or maintains it.

• - poids: 350 g/m²
• - Rr (résistance à la rupture): 20 kg/cm
• - maille: (5x5) mm²
• - coefficient de transparence: 30%.

According to an alternative embodiment, shown in FIG. 3, the two layers 4 and 6 are combined and united into a single one, 16, which rests on all of the corrugation ridges of the plate 1 and is, like the layers 4 and 6, embedded in a foam product 18 of which it constitutes the framework. The ply 16 ensures both the stiffening of the coating and the retention of the liquid product, while giving the assembly a high mechanical strength which allows it to withstand heavy loads while remaining flat. This frame 16 may, for example, be made of a ribbed expanded metal or glass cloth, which allows the coating to be produced at a lower cost. In a particularly advantageous embodiment, a mesh of high-strength plasticized glass fabric having the following characteristics is used:

• - weight: 350 g / m ²
• - Rr (breaking strength): 20 kg / cm
• - mesh: (5x5) mm ²
• - transparency coefficient: 30%.

This trellis has a mesh wide enough for the foaming liquid to pass through and can thus wet the tops of the supports on which the foam will hang by gluing. However, the meshes are fine enough that at the projection, there passes very little foaming liquid which would be lost for the realization of the coating.

• 1. On limite la perte de produit moussant qui passe au travers du treillis, à une quantité minime qui, dans le cas de la couverture fibre-ciment, vient se déposer en creux d'onde.
• 2. Le produit moussant passe quand même en quantité suffisante au travers du treillis pour que l'ensemble du revêtement ainsi formé soit adhérent sur les crêtes du support sans aucune adjonction de colle préalable.
• 3. Le treillis ainsi enrobé par le produit moussant peut lors de l'expansion monter dans la première couche de mousse pour se situer à coeur de celle-ci et ainsi participer à la résistance mécanique de l'ensemble.

So:

• 1. The loss of foaming product which passes through the mesh is limited to a minimal quantity which, in the case of fiber-cement roofing, is deposited in the hollow of the wave.
• 2. The foaming product still passes in sufficient quantity through the trellis so that the entire coating thus formed is adherent to the ridges of the support without any addition of prior adhesive.
• 3. The mesh thus coated with the foaming product can during expansion go up in the first layer of foam to be located at the heart thereof and thus participate in the mechanical strength of the assembly.

In this embodiment, as in the previous one, the whole of the plate 8 provided with the reinforcing reinforcement constituted by the plies 4 and 6 or by the single ply 16, is rigid enough not to rest on the support formed by the corrugated plate 1 only along the ridges 2, that is to say along lines spaced apart. It is clear, therefore, that such a reinforced foam plate can also be carried by other types of support. For example, as shown in fig. 4, it can be fixed directly to the successive purlins 20, 22 of a roof and constitute the cover by itself. A frame 24, comprising one or more reinforcing plies, is then stretched directly over the purlins 20, 22 and embedded in the foam product 28 which solidifies around it by adhering to the top of each of the purlins 20, 22. Thanks to the frame 24 the outer face of the cover is flat and the assembly has sufficient rigidity and provides effective insulation and sealing.

Of course, one or more additional layers of foaming product can be sprayed onto the reinforced foam plate 8, 18, 28, if necessary, to give the coating the appropriate thickness.

In all cases the coating is easy to implement. The foaming product plate 8, 18 or 28 is in fact formed from planar elements, which need only be fixed locally on their support. This coating is particularly advantageous for the protection of you wavy tures and in particular to transform a corrugated blanket into a flat surface blanket. It thus makes it possible to take advantage not only of the qualities of the coating itself, but also of a reduction in developed area and therefore in heat flux for the same thickness of insulation, while improving the external appearance.

In addition, with a reduced volume of material compared to that usually required on corrugated roofing, a regularity of thickness is very much improved, that is to say a better quality of insulation with a reduced cost.

Finally, as soon as the frame is put in place, and at any time thereafter, traffic safety is ensured.

Claims (9)

1. An insulating and fluidtight roof covering constructed on the site, comprising a flat sheet of foam material (8, 18, 28) having a substantially constant thickness, this sheet (8,18, 28) adhering to a support (1, 20) along spaced-apart lines, characterised in that the sheet is composed of a foam material (8, 18, 28) which solidifies almost instantaneously and directly and solely adheres to projections of the support (1, 20) forming said spaced-apart lines, and a reinforcing and stiffening element (4, 16, 24) having meshes which are sufficiently fine for retaining the major part of the foaming product, still in the liquid state, until its solidification, is embedded in the sheet (8. 18,28)

2. A covering according to claim 1. characterised in that the reinforcing element (4, 16. 24; comprises meshes of between 5 and 20 mm.

3. A covering according to one of the claims 1 and 2, characterised in that the reinforcing element (4, 16, 24) comprises a lower layer (4) having fine meshes retaining the liquid foaming product, and an upper layer (6) having large meshes having sufficient mechanical strength for ensuring safety of circulation.

4. A covering according to one of the claims 1 and 2, characterised in that the reinforcing element is formed by a single layer (16) forming a form bottom and ensuring the strength and made from a material such as ribbed expanded metal or a glass cloth.

5. A covering according to claim 3, characterised in that the first layer is constituted by a net of metal, a glass cloth or the like, while the second layer is formed by sheets of welded lattice, expanded metal, a perforated sheet, a netting, a grating, a plastic net orthe like;

6. A covering according to one of the preceding claims, characterised in that the support is constituted by corrugated roof sheets (1), the foam material adhering to the corrugation crests (2).

7. A covering according to one of the claims 1 to 5, characterised in that the support is formed by a succession of roofing purlins (20, 22).

8. A method for manufacturing a roofing covering according to one of the preceding claims, characterised in that it consists in placing a flat and taut reinforcing (4, 16, 24) having meshes which are sufficiently fine to retain the major part of a foaming product still in the liquid state until its solidification on a fixed support (1, 20) comprising projections forming spaced apart and parallel lines, and depositing on this reidorc- ing element a liquid foaming product which is solidified almost instantaneously by adhering solelv and directly to the projections (2) of the support after having wetted the lower surface of the reinforcing element and inflated around the latter, so as to constitute a planar sheet.

9. A method according to claim 8, characterised in that one or a plurality of other layers of foaming product is projected onto the reinforced planarfoam sheet (8, 16, 28).

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