Bituminous roofing membrane including a lightweight grid and ove

Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...

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428113, 428114, 428141, 428232, 428236, 428247, 428265, 428269, 428287, 428290, 428291, 428295, 428301, B32B 1100

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active

054397260

ABSTRACT:
A reinforced bituminous roofing membrane includes a first layer, a second layer, a third layer and bituminous material. The first layer consists essentially of a lightweight, open grid of adhesively bound non-woven fabric in which yarns in the cross-machine direction are held between pairs of yarns in the machine direction, each such pairs of yarns having one yarn that is essentially above the other and each such pair of yarns being coated and bound next to the other by adhesive which accumulates between the yarns of each pair. The second layer consists essentially of a high strength reinforcing fabric, while the third layer consists essentially of a porous fiberglass mat. The bituminous material saturates and contains the first, second and third layers, such that the three layers are completely embedded within the bituminous material and the bituminous material on one side of the membrane bonds through the layers to the bituminous material on the other side of the membrane.

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