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From: $50.50


GCP Applied Technologies (Formerly Grace) Perm-a-Barrier Detail Membrane is a self-adhesive, rubberized asphalt/polyethylene detail membrane for air and vapor barrier applications


Perm-a-Barrier Detail Membrane Product Data Sheet



Perm-A-Barrier Detail Membrane is ideal for protecting and sealing critical areas of the building superstructure from the damaging effects of the elements. By minimizing air and water vapor flow through the building exterior at transition areas, Perm-A-Barrier Detail Membrane:

  • Seals transition and detail areas to provide a continuous air barrier
  • Prevents premature deterioration of the building envelope


  • Fully bonded—transmits wind loads directly to the substrate
  • Waterproof and impermeable to moisture—impermeable to the passage of liquid water and water vapor
  • Air tight—exceeds CCMC requirements for air barrier membranes and complies with Massachusetts State Energy Code
  • Cross laminated film—provides dimensional stability, high tear strength, puncture and impact resistance
  • Cold applied—no flame hazard; self-adhesive overlaps ensure continuity
  • Flexible—accommodates minor settlement and shrinkage movement
  • Controlled thickness—factory made sheet ensures constant, non-variable site application
  • Aggressive, conformable adhesive— allows self-sealing around mechanical fasteners
  • Wide application window—Perm-A-Barrier Detail Membrane surface and ambient temperatures at 25°F (-4°C) and above

System Components

  • Perm-A-Barrier Detail Membrane— fully adhered flashing for protecting and sealing critical detail areas
  • Perm-A-Barrier Primer Plus — water-based vapor permeable primer used to facilitate tenacious adhesion of Perm-ABarrier self-adhered membranes to the substrate
  • Perm-A-Barrier WB Primer— high tack, water-based primer for use with Perm-A-Barrier Detail Membrane on cementitious and exterior gypsum wallboards
  • Bituthene Primer B2 LVC—low VOC primer used to prime green concrete or damp surfaces
  • Grace S100 Sealant—one part neutral curing, ultra low modulus silicone sealant for sealing penetrations, terminations, brick ties and final terminations.
  • Bituthene Mastic Trowel Grade— rubberized asphalt mastic for sealing patches, terminations, brick ties, etc.
  • Bituthene Liquid Membrane— two component, trowel grade, asphalt modified urethane for sealing patches, terminations, brick ties, etc.

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