Heavy-duty, waterproofing system used under tile, stone, or brick.

Dual-Flex is a heavy-duty, elastomeric waterproofing system used under tile, brick, stone, or pavers. Installed in multiple waterproofing layers, Dual-Flex forms a tightly-adhering membrane across floors and up curbs to create a durable, seamless barrier.

The system is engineered to provide maximum waterproofing protection over occupied spaces such as condos, apartment complexes, high-rise buildings, multi-use facilities, promenade decks, balconies, and other pedestrian areas.


  • Provides positive waterproofing with dual waterproofing protection
  • Reduces reflective cracking caused by substrate movement
  • Forms a monolithic, tightly-adhering, molded membrane across floors and up bases and curbs
  • Maintains elastomeric properties at low temperatures
  • Can be applied over new or existing surfaces
  • Environmentally safe, contains virtually no organic solvents and is VOC compliant
  • Installed only by professional, factory-trained Dex-O-Tex contractors

Technical Info

  • Bond Strength ASTM C482 (modified)
    Dry – 77 psi
    Wet – 62 psi
  • Tensile Strength Ceramic Tile Inst. SE S763
    Dry – 46 psi
    Wet – 50 psi
  • Breaking Strength ASTM D751 – 265 psi
  • Elongation Fabric Reinforced ASTM D751 – 50.5%
  • Hydrostatic Pressure Resistance ASTM D751
    (Method A, Procedure 1) – 240 psi
  • Ozone Resistant ASTM D1149
    (72 hrs @ 100 ppm No cracking, 90°F plus Hydrostatic crazing or waterFHA 4900.1) penetration
  • Dimensional Stability ASTM D1204 – <0.5%
  • Indention Resistance FMA 4900.1 Sect. 615-5 – No water (shower pan) penetration
  • Puncture Resistance FMA 4900.1 Sect. 615-5 – No water (shower pan) penetration
    System Performance ASTM C627
    (Modified to Comply With Ceramic Tile Institute moderate Commercial) – No water penetration
  • Microbial Resistance ASTM G21 – Passes Rating 1
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