Products / Karnak 31 Fiberglass Membrane

Karnak 31 Fiberglass Membrane is a fabric woven of fiberglass yarn and treated with a synthetic resin for compatibility with asphalt or tar cements and coatings, used as reinforcement in roofing and waterproofing maintenance. Its product page lists ASTM D1668 and Fed. Spec. HH-C-466b, with a nominal weight of 2.0 oz per square yard. It is sold in rolls 150 feet long in 36, 12, 9, 6 and 4 inch widths.