A ROOFING MATERIAL

Abstract: A sheet material (1), especially for roofing consists of a weather resistant plastic material that is reinforced with a suitable reinforcing material. A securing flap (8) preferably showing greater mechanical strength than said sheet material (1) is welded to the sheet material.

Description: A roofing material The present invention relates to an improved roofing material of the kind stated in the preamble of claim 1. By the aid of the present material a safer anchoring of the roofing material to its support is achieved. There are previously known coverings based on plastic with a suitable reinforcement, e.g. made of fibre glass felt, polyester we or a similar textile, the plastic material e.g. consisting of a weather-resistant plastic, e.g. polyvinyl chloride. Such a roofing material may be placed on a roof and secured to said roof in various manneers, e.g. by coarse aggregate/ coarse aggregate and sand loading, by adhering directly on a wooden support, or by mechanical mounting of the material on its support, said material being provided with a flap that is nailed/screwed to the support. The present invention will be disclosed in more detail with reference to the attached drawings, where Figure 1 shows an embodiment of a mounted sheet of a known kind, Figure 2 shows a sheet roll according to the invention as seen in an axial direction, and Figure 3 shows a roll of the roofing material according to the invention in perspecitve, and with part of the material being folded back so as to show the underside. In Figure 1 the anchoring of a conventional sheet 1 is shown said sheet being, if desired, placed on a migration barrier 2 and secured to the support by the aid of a self-boring and selv-screwing screw 3 and washer, reference numbers 4, 5, and 6 indicating an insulation, a moisture barrier, and a steel plate respectively. In Figure 1 a conventional sheet 1 is shown, its securing flap being manufactured from the same material as is said sheet and being provided by welding together suitable lengths of the sheet material. In order to ensure a satisfactory mechanical anchorage it is, thus, necessary that said flap shows high mechanical strength which may result in an "oversized" sheet for the intended pur¬ pose, thus, being more expensive than strictly necessary. According to the present invention an improved material is provided where the securing flap is manufactured of a ma¬ terial different from that of the sheet per se. The material of the securing flap will commonly have a structure comprising the same plastic material as said sheet, but it will be more strongly reinforced than said sheet and it will be attached to said sheet material by welding. Since said sheet is to be welded to said flap material, the plastic material of said sheet and said flap must, obviously be compatible, and preferably the same kind of plastic material is used. Thus, the flap material may be considerably stronger rein¬ forced than the sheet material per se, and, conseguentl , show considerably more mechanical strength than the sheet. In Figure 2 a roll 7 of a sheet material 1 is shown provided with securing flaps 8 that are welded onto said sheet. The flaps 8 shown in Figure 2 are shown facing away from the run out direction of roll 7, so that the material rolled out has to be folded back when said flaps are to be nailed to the support. Said flaps, obviously, may face in the other direction with reference to the roll out direction of the sheet, however, no special advantages are achieved by that. In Figure 3 a roll 7 is shown being partly placed on an imaginary support. Part of the sheet 1 is folded back to re¬ veal the underlying securing flaps 8. It will appear that the flaps welded to said sheet do not extend to the edges of sheet 1. Thus, overlapping and weld¬ ing to a previously mounted sheet will be simplified. The distance between two succeeding flaps 8 is not critical and is chosen from consideration of the intended use of the sheet.

Claims: CLAIMS: 1. A sheet material (1), especially for roofing, comprising a weldable, weather-resistant plastic material at least being reinforced with one reinforcing material, e.g. a polyester sheet, a fibre-glas sheet or another suitable reinforcing material, and said sheet material being provided with a securing flap (8) extending across the longitudinal direction of said sheet material (1), c h a r a c t e r i z e d i n that said seduring flap (8) is welded to said sheet material (1) . 2. A sheet material as claimed in claim 1, c h a r a c t e r i z e d i n that the flap (8) welded to said sheet material shows greater mechanical strength than said sheet material (1). 3. A sheet material as claimed in claim 2, c h a r a c t e r i z e d i n that said securing flap (8) consists of a reinforced plastic material, wherein said rein orcement is stronger than that of the sheet material (1). 4. A sheet material as claimed in any of claims 1-3, c h a r a c t e r i z e d i n that said securing flap (8) extends approximately across the entire width of said sheet material (1).

Inventors: LIEN PEDER, LIEN, PEDER
Applicants: PROTAN AS, PROTAN A/S
Application year: 1986
Main classification: E04D5
IPC codes: E04D5