USG DUROCK Brand Liquid Waterproofing Membrane – 1 Gallon | Crack Isolation & Shower Waterproofing

Overview

USG Interiors presents the Durock Brand Liquid Waterproofing and Crack Isolation Membrane, a versatile acrylic polymer-based solution designed for showers, steam rooms, and other wet areas in both residential and commercial settings. This one-component membrane functions as a water barrier and crack isolation layer in one easy-to-use system, helping protect substrates from movement and moisture over time.

Key benefits at a glance

The membrane delivers flexibility to accommodate minor substrate movement, a low permeance rating for a durable moisture barrier, and direct bonding to common drains. Its user-friendly format supports multiple installation methods, enabling contractors and DIY enthusiasts to tailor the approach to the project.

• Available in 1-gallon and 3.5-gallon pails for scale and project needs.
• Anti-fracture protection up to 1/8 in. (3 mm) over shrinkage and non-structural cracks.
• Can be rolled, brushed, troweled, or sprayed for adaptable installation.
• Fast drying time supports quick turnaround on job sites.
• Low permeance rating of 0.38 perms at 20 mils dry thickness per ASTM E96 Procedure E.
• Suitable for waterproofing floors, walls, and countertops.

Substrates and compatibility

Suitable for concrete, masonry, cement backerboard, gypsum-fiber panels, and gypsum-based cement toppings. It bonds directly to drains made of stainless steel, PVC, and ABS, helping simplify transitions around plumbing fixtures.

• One coat on vertical substrates with smooth surfaces (e.g., Fiberock Brand Tile Backerboard).
• Two coats on rough substrates (e.g., Durock Brand Cement Board) and for all horizontal applications.

Practical uses

Ideal for showers, wet rooms, and steam spaces where a dependable, flexible membrane can streamline installation and maintenance. Suitable for waterproofing floors, walls, and countertops, offering a single-pass solution for multiple zones in a tile installation.

Installation notes

In steam environments, the membrane may function without a separate vapor retarder when installed per guidelines and local codes. Always verify requirements for your project to ensure compliant performance.