Recommended Add-Ons
At a Glance
Why Choose This Product
Creates a waterproof layer beneath tile installations
Meets ANSI A118.12 requirements to accommodate substrate movement
Helps transfer loads across the tile assembly
Raised cavity design equalizes vapor pressure beneath tile
Combines waterproofing, uncoupling and crack isolation
Meets ANSI A118.10 and ANSI A118.12 standards
Product Information
The GURU® G-FLEX Uncoupling Membrane is a waterproof tile underlayment designed to provide uncoupling, crack isolation, load distribution, and vapor management beneath ceramic, porcelain, and natural stone tile installations. Manufactured from high-density polyethylene (HDPE) with a thermo-bonded polypropylene fiber backing, it creates a durable foundation for residential and commercial tile assemblies.
G-FLEX meets the requirements of ANSI A118.10 for waterproofing and ANSI A118.12 for crack isolation, allowing a single membrane to provide multiple performance benefits. When installed correctly, it creates a waterproof layer while accommodating substrate movement to help protect finished tile installations.
The raised circular cavity design promotes vapor pressure equalization beneath the tile assembly while distributing loads across the installation. This design helps support long-term tile performance over concrete and wood substrates in both residential and commercial applications.
G-FLEX is suitable for ceramic, porcelain, and natural stone tile installations requiring waterproofing, uncoupling, and crack isolation. It is available in multiple roll sizes ranging from custom-cut sections to full commercial rolls for projects of nearly any size.
Product Resources
Common Questions
G-FLEX is a waterproof uncoupling membrane installed beneath ceramic, porcelain, and natural stone tile to provide waterproofing, crack isolation, vapor management, and load distribution.
Yes. It complies with ANSI A118.10 for waterproofing and ANSI A118.12 for crack isolation.
Yes. It is designed for tile installations over both concrete and wood substrates.
The membrane is 1/8" (3 mm) thick.
It features a high-density polyethylene (HDPE) core with a thermo-bonded polypropylene fiber backing.
Yes. Its raised circular pattern promotes vapor pressure equalization beneath the tile assembly.
