Manufacturer of low slope and steep slope roofing products for commercial, industrial, institutional, and residential roofing and waterproofing applications.  CertainTeed has served the roofing industry for 100 years, establishing a solid reputation for quality, reliability, and technical innovation.
	GAF Materials Corporation has grown to become North America’s largest manufacturer of residential roofing (sold under the GAF-Elk brand) and commercial roofing (sold under the GAF brand).

The Duro-Last roofing system membrane is a proprietary thermoplastic formulation consisting of resins and plasticizers, stabilizers, biocides, flame retardants and U.V. absorbents. A weft-insertion knitted scrim that is laminated between two layers of film gives the membrane its strength and durability. The Duro-Last membrane is available in white, tan or gray.      Duro-Last has met or exceeded all major fire and wind code requirements, and regional approvals as necessary throughout the country. These certifications reinforce Duro-Last’s leadership in providing the consistent, watertight integrity that building owners expect.      Duro-Last has been approved by Factory Mutual as a 1-60,1-90, 1-105, 1-150 and 1-210 roofing system. Duro-Last is also listed by Underwriters Laboratories as a UL Class A material. Evaluation services ICBO and NES have merged to form ICC-ES, which has evaluated Duro-Last for the International Building Code (IBC). The Duro-Last roofing system has been approved by the IBC and by code agency MIAMI-DADE for use in their respective jurisdictions.      Duro-Last is proud to be a charter partner of the ENERGY STAR® Roof Products Program. The ENERGY STAR label indicates to building owners and managers that the Duro-Last white membrane can save them money on cooling costs due to its high reflectivity (reflects over 86% of the sun’s energy). Duro-Last is also a charter member of the Cool Roof Rating Council (CRRC) and a member of the United States Green Building Council (USGBC). Duro-Last participates in all major technical committees in the roofing industry, plus the American Society of Testing Materials (ASTM).

Low-Sloped and Flat Roofs Precision-fabricated, Watertight Protection for Flat Roofs and Low-Sloped Roofs The Duro-Last single-ply roofing system is ideal for any low sloped or flat roof design. Since 1978, over a billion square feet of Duro-Last membrane have been installed on buildings of all types. The Duro-Last roofing system is: Precision-fabricated to fit your building's low-sloped or flat roof. Every Duro-Last roof is manufactured to exact size in our controlled factory environment. This eliminates up to 85% of rooftop installation seaming and ensures an excellent fit, delivering worry-free, leak-proof, long-term protection for any low-sloped or flat roof design. Energy efficient. The Duro-Last white membrane has the highest retained reflectivity of any single-ply memnbrane rated by the EPA's ENERGY STAR ® Roof Products Program, saving significant energy and money for facilities with low-sloped and flat roofs throughout North America. Durable. The Duro-Last roofing system is resistant to fire, chemicals, grease, high winds, and punctures, and easily accommodates wide temperature extremes. Installed by authorized contractors. A Duro-Last installation on your building's low-sloped or flat roof is quiet and safe, without loud machinery, hazardous materials, noxious fumes, hot tar or mess. A new Duro-Last roofing system often can be installed over an existing roof without an expensive tear-off. Backed by the industry's best warranties for low-sloped or flat roofs. Duro-Last protects the commercial and industrial building owner with either a 15-year full warranty or a 20-year prorated warranty. Both warranties are transferable, and both provide maximum protection. Our standard warranty includes coverage for consequential damages that result from defects in the Duro-Last material and/or installation.