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Flex-Guard Crack Isolation Membrane

A primerless, pressure sensitive, elastomeric, crack isolation and anti-fracture system that can be used for interior and exterior applications. Provides stress crack protection.

  • Quick and easy to install
  • No priming required
  • Lightweight, easy to handle and cut (no tar residue)
  • Chalk lines visible through membrane for easy installation
  • 25 mil thickness
  • Extra heavy service rating
  • Provides sound reduction
  • Interior and exterior
  • Limited lifetime warranty
  • Non-hazardous, non-toxic (EPA 8260 & EPA 5030B tested)
  • Adhesive is solvent free, 100% solids, modified acrylic
Crack isolation and anti-fracture underlayment isolates up to 3/8” (10 mm) horizontal movement 1/4” (6 mm) for partial coverage as recommended in the TCNA Handbook for Ceramic, Glass, and Stone Tile Installation (Detail F-125-Partial).


  • Bridge concrete joints, cracks and expansion joints against horizontal movement of the substrate
  • Residential and commercial
  • Tile and stone
  • Decks and balconies
  • Malls
  • Hospitals
  • Restaurants
For installations over:
  • Concrete
  • Properly prepared ceramic tile
  • Exterior grade plywood
  • OSB
  • Hardwood flooring
  • Gypsum-based underlayment*
* Requires manufacturer’s sealer applied and cured according to manufacturer’s instructions.

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