Roofing sheet with upper layer of higher melting point than asph

Details Roofing sheet with upper layer of higher melting point than asph Roofing sheet with upper layer of higher melting point than asph

1982-05-24

1984-07-03

Mc Camish, Marion

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428286, 428291, 428489, 428522, 428906, B32B 700

Patent

active

044579837

ABSTRACT:
A thin, relatively flexible sheet formed in strips for application upon a roof surface and the like, with successive strips in overlapping relationship, is formed of a lamination of a lower layer made of a low temperature heat softenable material such as asphalt, a thinner middle layer formed of a non-woven fabric of relatively stable fibers, and an upper layer formed of a high temperature melting point monolithic material such as an ethylene vinyl acetate copolymer. Heat is applied, as for example, by a hand operated flame torch, to the lower layer of a strip to soften it. Then the strip is laid upon the surface, with an edge portion overlapping the next adjacent strip previously laid upon the surface so that each strip adheres to the upper layer of the preceding strip upon cooling and solidification of the heat softened asphalt layer. The fabric layer and the upper layer together stabilize and reinforce the sheet lamination when the lower layer is heated for application and also whenever the lower layer develops cold weather cracks. The lower melting temperature of the lower layer protects the upper layer by becoming visually too soft or runny before the applied heat affects the upper layer.

REFERENCES:
patent: 3817893 (1974-06-01), Karcher
patent: 4291086 (1981-09-01), Auten

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