MULTIPLE-LAYER ROOF COVERING Russian patent published in 1997 - IPC

FIELD: production of construction materials. SUBSTANCE: this relates to roofing and water-proofing materials and can be used for protection of buildings and structures from moisture in making roof coverings. High reliability is ensured due to compensation of motions in transfer from one layer of covering to another which is achieved by multiple-layer roof covering made in the form of strata including at least two functional layers made up of base and bituminous impregnated cover layers and interlayer. Used as lower layer adjacent to base is high-elastic bitumen-polymeric layer containing block-copolymer-styrene-butadiene-styrene. Used as upper layer is bitumen-polymeric layer containing ataxic polypropilene, and used as interlayer is polyethylene film with thickness of 0.012-0.015 mm or quartz sand can be used of following granulometric composition, mass%: 0.50-1.250 mm - 0.1-0.2; 0.30-0.50 mm - 13.0-14.7; 0.15-0.30 mm - 85.0-87.0; dust - the balance. EFFECT: high efficiency. 2 cl, 2 tbl