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USG Durock Liquid Waterproofing & Crack Isolation Membrane
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At a Glance
Quick Decision Guide
Size
1 Gallon
Membrane Type
Waterproofing & Crack Isolation
Crack Protection
Up to 1/8"
Permeance Rating
0.38 Perms at 20 Mils Dry
Steam Shower Use
Yes
Application Methods
Roll, Brush, Trowel or Spray
Waterproofing Coverage
80–100 sq. ft./gal. with One Coat
Standards
ANSI A118.10 & A118.12
Why Choose This Product
Key Benefits
Waterproofing Protection
Creates a liquid-applied waterproof membrane for wet areas
Crack Isolation
Protects over non-structural cracks up to 1/8"
Low Permeance
0.38 perm rating at 20 mils dry thickness
Steam Shower Ready
Suitable without an additional vapor retarder
Multiple Application Methods
Apply by roller, brush, trowel or spray
Direct Drain Bonding
Bonds directly to stainless steel, PVC and ABS drains
Fast Drying
Supports quicker turnaround between application stages
Broad Surface Use
Waterproofs floors, walls, countertops and shower assemblies
Product Information
Product Details
Specifications
Brand
USG™ Durock®
Part Number
170402
UPC
81099039591
Product Type
Liquid Waterproofing & Crack Isolation Membrane
Size
1 Gallon (3.78 L)
Membrane Composition
Acrylic Polymer-Based Elastomeric Membrane
Functions
Waterproofing, Crack Isolation & Vapor Retarder
Crack Protection
Up to 1/8" (3 mm) Non-Structural Cracks
Permeance Rating
0.38 Perms at 20 Mils Dry Thickness
Permeance Test
ASTM E96 Procedure E
Steam Shower Use
Yes, Without Additional Vapor Retarder
Application Methods
Roller, Brush, Trowel & Spray
Smooth Vertical Substrates
One Coat
Rough Substrates
Two Coats
Horizontal Applications
Two Coats
Waterproofing Coverage - One Coat
80–100 sq. ft./gal.
Waterproofing Coverage - Two Coats
40–50 sq. ft./gal.
Waterproofing Wet Film Thickness
15–20 Mils per Coat
Crack Isolation Coverage
25–30 sq. ft./gal.
Crack Isolation Coats
Two Coats
Crack Isolation Wet Film Thickness
25–30 Mils per Coat
Suitable Substrates
Concrete, Masonry, Cement Backerboard, Gypsum-Fiber Panel & Gypsum-Based Cement Topping
Suitable Areas
Floors, Walls, Countertops, Showers & Wet Areas
Drain Compatibility
Stainless Steel, PVC & ABS
Shower Pan Liner Use
Yes
Cure Indicator
Changes Color When Cured
Waterproofing Standard
ANSI A118.10
Crack Isolation Standard
ANSI A118.12
About This Product
Liquid Waterproofing for Showers and Wet Areas
USG™ Durock® Liquid Waterproofing & Crack Isolation Membrane is an acrylic polymer-based elastomeric membrane for residential and commercial tile and stone applications. The liquid-applied membrane waterproofs floors, walls, countertops, showers, and other wet areas while also functioning as a vapor retarder over approved substrates.
Steam Shower Waterproofing and Vapor Protection
With a permeance rating of 0.38 perms at 20 mils dry thickness when tested to ASTM E96 Procedure E, the membrane can be used in continuous-use residential and commercial steam showers without an additional vapor retarder. It also bonds directly to stainless steel, PVC, and ABS drains and can be used as a shower pan liner in accordance with applicable IPC and UPC provisions specified by USG.
Crack Isolation Up to 1/8"
The membrane provides anti-fracture protection over shrinkage and other non-structural cracks up to 1/8" (3 mm). It meets ANSI A118.10 requirements for load-bearing bonded waterproof membranes and ANSI A118.12 requirements for crack isolation membranes for thin-set ceramic tile and dimension stone installations.
Roll, Brush, Trowel or Spray Application
The fast-drying liquid membrane can be applied by roller, brush, trowel, or spray and changes color when cured. Smooth vertical substrates can require one coat, while rough substrates such as Durock® Cement Board and all horizontal applications require two coats. Suitable substrates include concrete, masonry, cement backerboard, gypsum-fiber panels, and gypsum-based cement toppings.
Product Resources
Documentation & Downloads
Common Questions
Frequently Asked Questions
Can USG Durock Liquid Waterproofing Membrane be used in steam showers?
Yes. Its 0.38 perm rating at 20 mils dry thickness allows it to be used in continuous-use residential and commercial steam showers without an additional vapor retarder.
How much crack isolation does the membrane provide?
It provides anti-fracture protection over shrinkage and other non-structural cracks up to 1/8" (3 mm).
How can Durock Liquid Waterproofing Membrane be applied?
The liquid membrane can be applied by roller, brush, trowel, or spray.
How many coats of waterproofing membrane are required?
One coat can be used on smooth vertical substrates such as USG Fiberock® Tile Backerboard. Two coats are required on rough substrates such as USG Durock® Cement Board and for all horizontal applications.
What is the coverage per gallon?
For waterproofing on smooth substrates, coverage is approximately 80–100 sq. ft. per gallon with one coat or 40–50 sq. ft. per gallon with two coats. For crack isolation, coverage is approximately 25–30 sq. ft. per gallon with two coats. Coverage decreases on porous or rough substrates.
What substrates can the membrane be applied over?
Suitable substrates include concrete, masonry, cement backerboard, gypsum-fiber panels, and gypsum-based cement toppings.
Does the membrane bond directly to drains?
Yes. It bonds directly to stainless steel, PVC, and ABS drains.
Does USG Durock Liquid Waterproofing Membrane meet ANSI standards?
Yes. It conforms to ANSI A118.10 for load-bearing bonded waterproof membranes and ANSI A118.12 for crack isolation membranes.