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Base and Ply Sheets

FlexBase® 80

  • Advanced Rubber Technology
  • Extraordinary Strength
  • Security in Multi-Ply Construction

FlexBase 80 is a high-strength, puncture, and fatigue-resistant, rubber-modified roof membrane designed for the waterproofing and reinforcement layer of a built-up or modified roofing system. It consists of two layers of fiberglass reinforcement sandwiched by Styrene-Butadiene-Styrene (SBS) rubber in a high penetration index asphalt mixture. FlexBase 80 can be used as the initial underlayment for any Garland HPR® roof system, used in conjunction with Weatherking® and Green-Lock® for a cold-applied system, or used with hot asphalt or Garlastic® as a multi-ply BUR. It can also be used as a base flashing or interply in Garland’s hot- or cold-applied systems.

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Product Specifications


Product Page Feature Graphic

Advanced Rubber Technology

When the SBS rubber in the FlexBase 80 sheet is properly dispersed throughout the high-penetration asphalt, the rubber provides increased thermal shock resistance, UV protection, heat resistance, elongation, and low-temperature flexibility. A special high-shear mixer is used in manufacturing to ensure proper dispersion. 

Product Page Feature Photos

Extraordinary Strength

FlexBase 80 is reinforced with two layers of fiberglass. The strength provided by the dual fiberglass scrim resists the movement created by today's modern buildings. In addition, the dual fiberglass scrim in FlexBase sheets provides tensile strength in excess of 200 lbs. per inch (3572 kg/m) in the machine and cross-machine direction. This translates to long-term resistance to splits and tears in the completed roof system. 

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Security in Multi-Ply Construction

FlexBase 80 is the base component of 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. This unique combination minimized dependence on perfect workmanship, contact adhesive seaming, etc. 

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