Importance

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Abstract

A roll roofing product includes an elongate strip of inorganic fibrous base sheet impregnated with asphaltic matrix. An upper side of the base sheet is longitudinally divided into two elongate lateral portions each about one-half the width of the base sheet, but one being slightly wider than the other. On the under side the base sheet is similarly longitudinally divided into two elongate lateral parts each about one-half the width of the base sheet, but one being slightly wider than the other. The wider portion and the wider part are not congruent with one another. The narrower portion is coated with a cover layer of protective coarse granular material, while the wider portion is coated with fine-dimension granular material effective to prevent the base sheet from self adhering when rolled up on itself. The wider part is coated with a layer of asphaltic adhesive, while the narrower part is also coated with a layer of fine-dimension granular material also effective to prevent the base sheet from self adhering when rolled up on itself. When installed on a roof in plural partially overlapping strips, the roofing material is overlapped a little more than about 50% to everywhere provide dual coverage, and also to provide a duality of sealing bonds preventing permeation of the roof by water. One sealing bond is formed between the layer of asphaltic adhesive on the wider part of an overlying strip of the roofing material and the wider portion of an overlapped strip of the roofing material. The fine-dimension granular material on this wider portion does not prevent bonding by the adhesive. The other sealing bond is formed by the asphaltic adhesive and the deck of a roof on which the roofing material is installed.

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First Claim