Crack Isolation and Waterproofing

A five gallon pail of TEC’s crack isolation membrane, HydraFlex™
A five gallon pail of TEC’s crack isolation membrane, HydraFlex™

HydraFlex™ Waterproofing Crack Isolation Membrane


Ready-to-use, flexible, mold and mildew resistant waterproofing crack isolation membrane for interior and exterior applications. Forms a smooth, monolithic, watertight surface over walls, floors and ceilings. HydraFlex™ Membrane stops in-plane cracks up to ¼" (6 mm) wide at the subfloor from telegraphing through to ceramic and stone tile. For residential to extra heavy commercial applications.

  • Can be applied by roller, trowel or spray.
  • Exceeds ANSI A118.10 Specifications for Waterproof Membranes.
  • Exceeds ANSI A118.12 Specifications for Crack Isolation Membranes.
  • Use for Positive Hydrostatic Pressure Applications.
  • Fast Drying – ready for tile installation in 2 to 3 hours.
  • No mesh required (except for waterproofing installations at changes in-plane and substrate joints).
  • Apply over new (green) concrete as little as 3 days old.
  • Isolates cracks up to 1⁄4" (6 mm).
  • Resists mold and mildew growth.
  • IAPMO approved.
  • Contains low VOC.
  • Available in 1 gallon and 5 gallon pails.
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HydraFlex™ Waterproofing Crack Isolation Membrane
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