ROOFING BASE SHEET

The roofing base sheet is the bottom waterproofing layer on a multilayer roofing membrane system. It is made of fiberglass or reinforced polyester, or composite reinforcement and is coated with modified bitumen asphalt. This is asphalt enhanced with plastic or rubber polymer. Base sheets are surfaced with heat-weldable film, sand or a release film depending on the application requirements.

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