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Base and Ply Sheets

HPR® Torch-Applied Base Sheet

  • High Tech Base Sheet
  • Superior Strength
  • Advanced Rubber Technology

HPR Torch Base Sheet is the underlayment ply for any of Garland's torch-applied membranes. HPR Torch Base Sheet is a Styrene-Butadiene-Styrene (SBS) membrane specially formulated to accept the high heat from a torch. It has a burnable polypropylene backer that melts when the proper torching temperature has been reached. The HPR Torch Base Sheet eliminates the use of a kettle and also allows the torch-applied system to be installed with a one-ply underlayment. DO NOT USE the HPR Torch Base Sheet with hot asphalt or cold adhesives.

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Product Specifications


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High Tech Base Sheet

The HPR Torch Base Sheet has a high percentage of SBS rubber that gives the system superior puncture and abrasion resistance when fused with the torch-applied membrane. It also has high tensile and elongation characteristics. 

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Superior Strength

The HPR Torch Base membrane is reinforced with a dual fiberglass scrim. The superior strength provided by this reinforcement resists the movement created by today's modern buildings. In addition, HPR Torch Base Sheet provides tensile strength in excess of 200 pounds per inch in the machine direction. This translates to long-term resistance to splits and tears in the completed HPR torch-applied roof system. 

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Advanced Rubber Technology

The modifier utilized in HPR Torch Base Sheet is SBS. When the SBS rubber is properly dispersed throughout the high-penetration asphalt, the rubber provides increased thermal resistance, UV protection, heat resistance, elongation, and low-temperature flexibility. A special high-shear mixer is used in manufacturing to ensure proper dispersion. 

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