A preformed one-piece composite for reinforcement and for suppressing the curling tendency of a bituminous roofing sheet

摘要

A preformed, unitary composite consists of: (1) a first layer comprising an open, non-woven grid of low shrinkage, continuous filament polyester yarns that are at low tension and adhesively secured together; and (2) a second layer comprising a lightweight, preformed fibreglass mat adhesively secured to one side of the first layer, the adhesive securing the layers together such that at least some individual yarns of the first layer are at least partially coated and impregnated by the adhesive without forming a film that closes all openings throughout the composite. Also claimed is the production of the above composite which comprises: (i) adhesively securing together the continuous filament yarns of a first layer as above using vulcanisable rubber binder while maintaining an open non-woven grid; and (ii) adhesively securing the first layer to a second layer as above, using vulcanisable rubber binder to form a composite, such that at least some individual yarns of the first layer are at least partially coated and impregnated by the adhesive without forming a film that closes all the openings through the composite.