Guru Water-Stop Waterproofing Membrane 108 Sq Ft Roll (3’3″ x 32’10”)


Waterproofing and standard crack isolation membrane.

18 in stock



WATER-STOP is a thin load bearing, bonded, sheet membrane for waterproofing applications. Installed using an appropriate thin-set mortar and with the W-S waterproofing accessories; bands, tapes, corners and flashings, is a complete assembly bonding together to create a watertight layer.
The bonded waterproof membrane system gives better moisture control by protecting all substrate below tiles from water getting under the surface and stagnating, so that the tiling base is free of saturated material, mold grow, bad smell and moisture deterioration.

WATER-STOP meets the American National Standard for Thin-Set Ceramic Tile and Dimension Stone Installations ANSI A118.10 for Load Bearing, Bonded, Waterproof Membranes and ANSI A118.12 for Crack Isolation Membranes. It is in compliance with The Uniform Plumbing Code and The International Plumbing Code. WATER-STOP membrane is an IAPMO listed product (files 9205 and 9990).

With the WATER-STOP which assures perfect waterproofing and provides the professional installer with a wide range of roll sizes and W-S accessories to create a watertight layer to protect the structure and tiling from moisture and substrate cracking, GURU takes position as benchmark in tile installation waterproofing systems.


Water-Stop Applications: 

On the Sub Floor:                                           Over old flooring:                                   Walls: 

Additional information

Weight 7 lbs
Dimensions 39.5 × 4 × 4 in