The Duro-Last roof membrane is a proprietary thermoplastic formulation that provides exceptional flexibility, reflectivity, resistance to UV radiation, and flame retardance. Roofing system performance is a balance between film formulation, membrane thickness, and reinforcement. Duro-Last adds no filler material to increase the membrane thickness—the film is the same proven formula from top to bottom. Plus, the membrane’s top film thickness is equal to or greater than that of other single-ply products.
A key Duro-Last difference is the reinforcement scrim within the membrane. It’s a weft-insertion scrim with a density of 14 x 18 threads-per-inch—among the highest in the industry.
The Duro-Last membrane is available in terra cotta, tan, dark gray, gray, and white. Duro-Last offers membranes that are 40 mil, 50 mil, and thicker. The standard Duro-Last 40-mil membrane is classified as an ASTM D4434 Type IV PVC roofing system, but the strength characteristics pass all the standards for 50-mil products, which are classified as ASTM D4434 Type III PVC. It can be mechanically attached, adhered, or induction welded using the Duro-Bond™ system.