Waterproof Tile Underlayment with Uncoupling Protection GURU® G-FLEX Uncoupling Membrane is a 1/8" waterproof tile underlayment that helps protect ceramic, porcelain, and natural stone installations from substrate movement and moisture. Its HDPE waterproof sheet and thermo-bonded polypropylene fiber backing create a durable layer beneath tile while supporting reliable mortar bonding. Crack Isolation Membrane for Added Tile Protection G-FLEX allows the tile covering and substrate to move independently, helping reduce stress that can contribute to cracked tile. It meets ANSI A118.12 requirements as a crack isolation membrane and ANSI A118.10 requirements as a waterproofing membrane, combining two important protective functions in one tile underlayment. Vapor Management and Load Distribution The raised cavity design provides space for vapor pressure compensation while distributing loads and heat across the tile assembly. Depending on the complete assembly, independent ASTM C627 testing produced Heavy or Extra Heavy service ratings, giving residential and commercial projects a proven foundation for long-term tile performance. Interior and Exterior Tile Applications G-FLEX is designed for interior and exterior tile installations over suitable substrates. It has been independently tested over concrete, plywood, and OSB assemblies. Its combination of waterproofing, uncoupling, and load performance makes it suitable for residential floors and demanding commercial spaces such as kitchens, food plants, breweries, dairies, and airports.
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