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Membranes/Capsheets

KEE-Stone® FB 60 (2-Ply Hybrid Roof System)

  • Long Lasting & Durable
  • Superior Chemistry & Manufacturing
  • UV Resistant & Energy Saving

KEE-Stone FB 60, a thermoplastic cap sheet modified with Ketone Ethylene Ester (KEE), is designed as the top component in a multi-ply hybrid system incorporating Garland-approved modified bitumen base sheets. This unique sheet incorporates a high quality KEE for superior flexibility and strength. Under the attractive, bright white surface, this membrane is reinforced with a unique polymer-coated high tensile strength polyester scrim. FB 60 is also offered in medium gray which helps to hide dirt and debris. This distinctive composition provides exceptional puncture, tensile, and tear resistance while preserving the membrane's flexibility. Polyester fleece (6.5 oz. per sq. yd.) is heat bonded to the backside for superior adhesion in hot or cold adhesives. KEE-Stone meets and exceeds ASTM D 6754, the standard specification for KEE-based sheet roofing.

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KEE-Stone FB 60 Photo

Superior Chemistry & Manufacturing

Garland’s KEE-Stone thermoplastic chemistry uses the industry’s highest quality KEE compound for the longest-lasting weatherability. This formula exhibits superior heat resistance while retaining its low-temperature flexibility. While some thermoplastic sheets only add quality KEE above the scrim, KEE-Stone is formulated with KEE throughout the entire sheet because the sheet is only as strong as its weakest point.

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Long-Lasting & Durable

KEE-Stone exceeds standard weathering tests, standing up against even the harshest weather and UV radiation. In accelerated weathering tests, KEE-Stone shows no signs of cracking or cratering even at 100X magnification, ten times more than the ASTM standard requires. KEE-Stone retains more than 90% of its breaking strength, elongation, and flexibility in heat aging tests.

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UV Resistant & Energy Saving

KEE-Stone FB 60 is available in both bright white and medium gray. The white surfacing is designed to reflect damaging UV rays, protecting your building from solar heat gain. The medium gray color offers moderate reflectance, ideal for northern climates where retaining some solar heat is beneficial, and also helps to hide dirt and debris. For both colors, the KEE formula locks in the plasticizer within the membrane to prevent the damaging migration that causes lesser materials to dry and crack under UV exposure.

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