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GAF Materials Corporation
GAF Composite Roof
GAF CompositeRoof Systems - Page 2
GAF Composite Roof
| GAF CompositeRoof™ Systems GAF CompositeRoof systems combine the strength of premium GAFGLAS® BUR with the elongation and flexibility of RUBEROID® modified bitumen membranes. Depending on which GAF CompositeRoof system is selected, you can obtain tensile strengths of up to 300 lbf/inch, and strain energies as high as 70-lbf-in.in2-both of which exceed NBS and NIST published recommendations.**
To meet the most demanding roofing applications, every GAF CompositeRoof system includes: The exceptional tensile strength of GAF CompositeRoof systems comes from the use of premium GAFGLAS BUR felts. A comparison of the tensile strength of a typical GAF CompositeRoof versus modified bitumen systems is shown at left. The GAF CompositeRoof selected includes two plies of premium GAFGLAS PLY 6® felt and one ply of RUBEROID Mop membrane (Specification I-2-1-MG). While all of the systems shown are typically eligible for 15-year guarantees, the GAF CompositeRoof system beats the three modified bitumen systems hands down, with tensile strength of over 200 lbf/inch. The superior flexibility and elongation characteristics of GAF CompositeRoof systems are derived from the use of RUBEROID modified bitumen membranes. As illustrated in the chart below, this GAF CompositeRoof exceeds typical BUR and MB systems in total elongation. |
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Typical Tensile Strength of Select GAF CompositeRoof System Versus
Modified Bitumen Roofing Systems
The tensile strength of this GAF CompositeRoof system is greater than either the fiberglass- or polyester-reinforced modified bitumen roofing systems shown. The fiberglass-reinforced system shown includes two plies of quality mop-applied MB membranes, while the polyester-reinforced systems include a base sheet and one ply of either a mop-applied of torch-applied MB membrane. Typical Elongation of Select GAF
CompositeRoof System Versus BUR and MB Systems
The elongation of the GAF CompositeRoof system (Specification I-2-1-MG) far exceeds the typical elongation of BUR systems. The polyester-reinforced system includes a base sheet and one ply of a torch-applied membrane, while the fiberglass-reinforced system shown includes two plies of quality mop-applied MB membranes. ** NBS Building Series 55 "Preliminary Performance Criteria for
Bituminous Membrane Roofing" and NIST Building Science Series 167 "Interim
Criteria for Polymer-Modified Bituminous Roofing Membrane Materials". |
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| The Next Generation in Roofing Perhaps the most advanced measure of mechanical performance that is routinely performed on roofing membranes is system strain energy. It combines the measurement of tensile strength and elongation into a single parameter that demonstrates the superiority of GAF CompositeRoof system performance. Roofing systems with high strain energy have the tensile strength necessary to withstand normal roof stresses, while providing the required elastomeric properties to accommodate normal roof movement. As illustrated in the chart at right, GAF CompositeRoof systems far exceed either BUR or modified bitumen systems in this most critical physical characteristic. |
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