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

Why choose USG DUROCK Liquid Waterproofing Membrane

USG Interiors' DUROCK Liquid Waterproofing Membrane is an acrylic polymer based solution designed to combine waterproofing with crack isolation and vapor management. It's ideal for showers, wet areas, and spaces with heavy use, including steam environments where heat and humidity are common. The product offers a streamlined alternative to layering multiple products, helping tile and stone installations stay protected over time.

Designed for both residential and commercial projects, the membrane works with a variety of substrates such as concrete, masonry, cement backerboard, gypsum-fiber panels, and gypsum-based cement toppings. Its formulation is intended to tolerate typical substrate movement, providing anti-fracture protection up to 1/8 inch (3 mm) over shrinkage and other non-structural cracks, which can be helpful in busy bathrooms and kitchens where movement occurs.

Performance attributes include a very low permeance rating of about 0.38 perms at 20 mils dry thickness (per ASTM E96 Procedure E). That level of moisture control supports tile and stone installations in wet zones while maintaining a breathable barrier where needed. The membrane dries quickly, supporting faster project turnaround times and less downtime between steps.

Versatile application and bonding

Application is flexible: it can be rolled, brushed, troweled, or sprayed to suit different surfaces and angles. It bonds directly to drains made of stainless steel, PVC, and ABS, providing reliable connections in wet environments. It’s suitable for waterproofing floors, walls, and countertops, offering a single product for mixed tiling tasks.

• Vertical surfaces: one coat on smooth substrates like Fiberock Brand Tile Backerboard for a clean, even first layer.
• Horizontal surfaces: two coats on rough substrates like Durock Brand Cement Board for thorough coverage.
• Substrates include concrete, masonry, gypsum-fiber panels, and gypsum-based toppings.

Usage tips and availability

Available in 1-gallon and 3.5-gallon pails, the membrane supports different project sizes. It can be used in showers and steam rooms without an additional vapor retarder when installed per guidelines, though proper substrate prep and coverage are essential for best results. Quick drying minimizes downtime between coats or subsequent tiles.

In real-world bathrooms and steam spaces, installers often combine this membrane with trusted setting mortars and grouts to complete a durable, moisture-resistant surface. While outcomes depend on the full installation system, the DUROCK membrane offers a practical approach to managing moisture and cracking in demanding wet areas.