Laminated bituminous roofing membrane

Abstract

A laminated bituminous roofing membrane including: (i) a fibrous sheet; (ii) a first bituminous layer laminated on one surface of the fibrous sheet, the bituminous layer being composed of bitumen or a bituminous mixture; (iii) a synthetic resin sheet or film laminated on the other surface, opposite to the surface laminated to the fibrous sheet, of the first bituminous layer; (iv) a second bituminous layer laminated on the other surface of the fibrous sheet, the bituminous layer being composed of bitumen or a bituminous mixture; and (v) a mineral aggregate layer deposited on the opposite surface of the second bituminous layer. This laminated bituminous roofing membrane can be readily and directly applied in a cold-application process on a substrate to form a waterproofing layer in which the joint portions of adjacent roofing membranes are completely water-tightly bonded and the formation of blistering and deterioration due to the presence of moisture or water from the substrate is prevented.

Dependencies are inferred from the claim text.