USG Durock Liquid Waterproofing & Crack Isolation Membrane is a ready-to-use acrylic polymer membrane engineered for interior tile and stone installations. It provides low permeance performance for wet areas and continuous-use steam environments, meets ANSI A118.10 and A118.12 standards, and offers anti-fracture protection up to 1/8 inch. Designed for use over properly prepared substrates such as concrete, cement board, masonry, and gypsum-based materials, the membrane dries quickly and forms a flexible, durable film that bonds with modified or unmodified thin-set mortars.

Key Features

ANSI-Compliant: Meets ANSI A118.10 for waterproofing and ANSI A118.12 for crack isolation.
Low Permeance: 0.12 perm rating per ASTM E96 Method E for steam room and steam shower applications.
Crack Isolation: Bridges substrate movement up to 1/8 inch (3 mm).
Quick-Dry Formula: Dries in approximately 1–2 hours per coat under standard conditions.
Flexible Application: Apply with roller, trowel, or brush; no mixing required.
Tile-Ready Surface: Compatible with modified and unmodified thin-set mortars.
Low-VOC Formulation: Less than 1 g/L for indoor compliance.
Color Change Cure: Bright blue application color that deepens as it dries.

Specifications

Specification	Details
Type	Acrylic-based liquid-applied membrane
Use	Interior wet areas, steam rooms, showers
Crack Isolation	Up to 1/8 in (3 mm)
Perm Rating	0.12 perms (ASTM E96 Method E)
Dry Time	1–2 hours per coat at 73°F / 50% RH
Color	Bright blue (dries to deeper blue)
VOC Content	<1 g/L
Packaging Options	1 gallon and 3.5 gallon buckets
Certifications	Meets IAPMO & ICC-ES standards; UPC listed

USG Durock Liquid Waterproofing & Crack Isolation Membrane provides low permeance waterproofing and ANSI-rated crack protection for interior wet area and steam applications.

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USG Durock Liquid Waterproofing & Crack Isolation Membrane