Ideal for its use with cold apllication cements and coatings, Karnak 31 Fiberglass Membrane is a waterproofing fabric woven entirely of fiberglass yarn. Thanks to its high flexibility, the Karnak 31 conforms to all contours and bends as required in general roofing and waterproofing maintenance. It is treated with a synthetic resin in the proper balance to give complete compatibility with asphalt or tar and all accepted waterproofing and coating compounds. Benefits High tensile strength. Contour flexibilty without cracking. Will not rot or decay. Acid and alkali resistant.