Subliner Dry

Subliner Dry & Flex Pro is a self- adhering tile underlayment with anti – fracture properties rated “High Performance” as per ANSI 118.12. The product can protect surface coverings against lateral subfloor movement of up to 3/8”.

Subliner Dry & Flex Pro is made from highly tear-resistant non-woven polypropylene material combined with a proprietary asphaltic pressure sensitive adhesive layer. The product system provides strong sound deadening and reduction properties, perfect bond to tile and stone coverings using any type of modified thinset mortars as per ANSI 118.4.



Subliner Dry & Flex Pro is suitable for fast and clean installations over many wood and concrete subfloors offering a low profile application. The product system primarily protects tile coverings against lateral movement of subfloor and structures. While not recommended for installations subject to permanent water pressure or use as a sealed assembly for water containment, the waterproof properties of the membrane’s asphaltic layers will add much value and protection to a tile installation in areas subject to moisture exposure from heavy duty cleaning.

Subliner Dry & Flex Pro is installed with wedi PRO Primer, suitable for most substrates and subfloors as listed here. It is equipped with a release paper backing and is applied easily and cleanly using a 35 – 50 lb roller to ensure no air bubbles or wrinkles are left.

  • Thin profile tile underlayment installation
  • Sound Reduction built into product
  • High Performance Crack Isolation against up to 3/8” inch lateral subfloor movement
  • 100% mold and mildew proof due to the product ‘s natural composition
  • Easy and clean to cut to size using a utility knife or scissors
  • Fully supports tile and stone across the surface while isolating tile, grout and thinset mortar installation against stresses due to lateral movement
  • Faster and more economic installation due to peel & stick methodology replacing a layer of thinsrt mortar usually applied with common uncoupling membranes

Technical properties sealing and decoupling membranes

Material base Non- woven Polypropylene Fleece with pressure sensitive asphaltic adhesion layer
Fleece Color White
Membrane Width 40 inches ( 1.016 m)
Membrane Length 50 ft. ( 15 m)
Membrane Thickness 40 Mil
Square Foot Area/ Unit 166 square feet
Processing temperature +10°C to +30°C/50°F to 86°F
Fungus & Microorganism Resistance ASTM G21 Passed; No Growth
Robinson Floor Test ASTM C627 Rated “Extra Heavy”
Certificate / Approval Product & Quality Management / Control ISO 9001:2001
Compliance with ANSI 118.12 Specifications for Crack Isolation Membranes for Thinset Ceramic Tile and Dimension Stone Installation Compliant
Crack Resistance ANSI 118.12 ; Section 5.4 Rating “ High Performance”; No cracks in Test Specimens with up to 3/8” subfloor separation
5 week Shear Strength ANSI 118.12; Section 5.1.5 (Requirement >50 PSI) 51 PSI
Aging Shear Strength ANSI 118.12; Section 5.1.6 (Requirement >50 PSI) 95 PSI
IIC Rating (Impact Isolation Class- Drop/Impact Sounds) (Tested with 12”x12” porcelain tile over wedi Subliner Dry & Flex Pro over 6” slab without suspended ceiling according to ASTM E492-09 and E989-06 (2012)) 46
STC Rating ( Sound Transmission Class- Airborne Sounds) (Tested with 12”x12” porcelain tile over wedi Subliner Dry & Flex Pro over 6” slab without suspended ceiling according to ASTM E90-09 and E413-10.) 53
Order no. Designation Length x width x thickness
US5000003 wedi Subliner Dry & Flex PRO 39.25″ x 50″
(163.54 square feet)
US5000004 wedi PRO Primer 1 container

Areas of use wedi Subliner Dry & Flex PRO

wedi Subliner Dry & Flex is a membrane sealing system for humid areas with moderate load, i.e. moisture exposure classes A0 and B0 as per the ZDB data sheet; this includes, but is not limited to:

  • Domestic bathrooms
  • Hotel bathrooms
  • Balconies and terraces

With a test certificate under building regulations, it is approved for use in forming a composite sealing layer in high-load wet areas of load classes A and C; this includes, but is not limited to:

  • Shower systems
  • Swimming pool surrounds
  • Commercial kitchens and laundries

In areas requiring technical approval, only components verified with the system should be used. Corresponding information is included in the general test certificate under the building regulations.

  • General crack isolation, sound reduction and tile underlayment use and over suitable subfloor construction in dry areas
  • New Construction of Residential/Commercial use buildings
  • Renovation in Residential/Commercial use buildings
  • Over wooden or concrete substructures on floors



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