USP™ STANDARD APP 160 MODIFIED BITUMEN MEMBRANES are manufactured from formulas using high quality materials available in the market today and have been the principle waterproofing components in U.S. Ply roof systems for over 24 years. U.S. Ply has engineered and developed USP™ APP (Atactic Polypropylene), torch applied only, modified bitumen membrane to meet or exceed the industry standards for high performance membranes.

U.S. Ply begins with select grades of asphalt which are then modified with thermoplastic (APP) polymers. The result is a modified bitumen compound that demonstrates excellent waterproofing characteristics, extreme heat resistance, low temperature flexibility and elongation properties. U.S. Ply then strategically adds reinforcements in the modified bitumen compound to incorporate additional performance characteristics into the membrane.