GAF CompositeRoof® Systems
"GAF CompositeRoof® systems exhibit exceptional strain energy for long-lasting, reliable roofing system performance"

The strength of BUR. the flexibility of modified bitumen...GAF continues its tradition of innovation with GAF CompositeRoof systems. the next generation in roofing. CompositeRoof systems:
. combine the strength of premium GAFGLAS built-up roofs with the elongation and flexibility of RUBEROID® modified bitumen membranes 
. Tensile strengths up to 300 Ibf/in and strain energies as high as 70 Ibf-in/in
  
The right combinations...With performance testing of tensile strength. elongation. and the benchmark strain energy measurement. GAF has combined the best of GAFGLAS® 13L"R and RUBEROID® modified bitumen membranes to create exceptionally strong. durable roofing systems. 
Every GAF CompositeRoof system includes at least:
. one ply of premium GAFGLAS BUR felt for strength.
. three total layers of roofing felts/membranes for system redundancy and long-term reliability

The use of at least one layer of polyester-reinforced RUBEROID Mop modified bitumen membrane ensures superior flexibility and elongation characteristics. For example. Specification I-3-1-\1GP provides more than twice the elongation at O°F of typical built-up roofing.

Exceptional strain energy...GAF CompositeRoof systems far exceed either BUR or modified bitumen systems in strain energy. one of the most advanced measures of mechanical performance. This combines the measurement of tensile strength and elongation in a single parameter to indicate whether a roof system has the tensile strength necessary to withstand normal roof stresses and the elastomeric properties to accommodate normal roof movement.

Top performance...GAF Composite Roof systems are the choice for today's most demanding roof applications: 
. exceptional strength . superior flexibility . unsurpassed strain energy . eligibility for guarantees of up to 20 years when installed according to GAF specifications and standards

Typical Strain Energy Chart