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Base and Ply Sheets

HPR SA FR Base Sheet

  • Security in Multi-Ply Construction
  • Superior Strength
  • Advanced Adhesive Technology

HPR SA FR Base Sheet is an SBS (Styrene-Butadiene-Styrene), fiberglass reinforced, self-adhering, modified bitumen underlayment for the StressPly® SA FR Mineral roofing systems. The top surface of the base sheet has an adhesion-promoting polyolefin film. The bottom has an adhesive backing with a peel-off release film.

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Professional photos of Port Arthur Elementary School

Security in Multi-Ply Construction

HPR SA FR Base Sheet is the interply layer in a multi-ply roof system. It combines the inherent advantages and proven performance of multi-ply protection with the strength, flexibility, and elongation of elastomeric systems. 

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Superior Strength

The HPR SA FR Base Sheet is reinforced with fiberglass, providing superior strength that surpasses traditional roofing underlayments. This translates to long-term resistance to splits and tears in the completed StressPly SA FR Mineral roofing system. 

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Advanced Adhesive Technology

The HPR SA FR Base Sheet incorporates the latest asphalt technology to ensure excellent adhesion of the completed StressPly SA FR roofing system. 

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RMer Span Curve Panels are being installed onto the North County Regional Library