Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System
An elastomeric waterproofing system that uses TetraCrete® and other proprietary components. Designed for walking decks and roof coverings with ICC ESR-3672 certification for Class B fire rating. Perfect for residential and light commercial applications.
Key Benefits
Code Compliant
ICC-ES listed (ESR-3672)
Class B Fire Rated
Meets fire safety standards for walking decks
Weather Resistant
Superior protection against harsh weather
Multi-Substrate
Works on plywood, concrete, and wood
Recommended Applications
Professional finished deck surface
Commercial installation example
Technical Specifications
Coverage Rates
Dry Times
Minimum Thickness
TetraCrete application requires a minimum thickness of 1/16" for proper performance.
Powered by TetraCrete®
Our concrete system delivers four key properties for superior performance
Fire-Resistance
Meets or exceeds stringent building code fire standards
Flexibility
Elastomeric properties accommodate structural movement and thermal expansion
Durability
Perfect for residential and light commercial foot traffic
Weather-Protection
Resists UV rays, rain, extreme temperatures, and freeze-thaw cycles
Application Instructions
Plywood Deck Installation (8 Steps)
Surface Preparation
Clean and prepare the plywood deck surface, ensuring it's dry and free of debris.
Seal Joints
Apply sealant to all joints, edges and seams to prevent water infiltration and leakage.
Apply Base Coat
Apply base coat at 60-75 sq ft per gallon coverage rate.
Embed Fiberglass
Install fiberglass reinforcement in wet base coat for added strength.
Apply TetraCrete Mixture
Apply TetraCrete at 70-85 sq ft/gallon with minimum 1/16" thickness.
Texture Coat Application
Spray texture coat at 90-100 sq ft per gallon for desired finish.
First Top Coat
Apply first top coat at 150-180 sq ft per gallon.
Second Top Coat
Apply final top coat for complete protection and beautiful finish.
Concrete Surface Installation (6 Steps)
For concrete surfaces, the process is simplified to 6 steps, following a similar coating progression with adjustments for the concrete substrate.
Frequently Asked Questions
What is the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System?
The Deck Flex W.F. Fire Retardant System is a walking deck and roof covering system. It is a coating system designed for use, without metal lath, over exterior-grade plywood substrates. It can also be used on concrete decks. When installed as described in Section 4.3 of ESR-3672, it is used as a Class B roof covering.
What is the fire rating for the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System?
When the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System is applied as described in Section 4.2.2 of ESR-3672 on a plywood or concrete deck with a maximum slope of 1/4 inch to a horizontal foot (2.1 percent slope), the system has a Class B roof classification.
Can the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System be applied to concrete?
Yes, the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System is evaluated for use on both concrete decks and plywood surfaces. It provides a Class B fire rating. For applications requiring a Class A fire rating over plywood substrates, see our Deck Flex W.M. Walking Deck & Roof Covering Waterproofing System.
What is the material mixing ratio for the texture coat in the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System?
The Deck Flex Texture Coat is a mixture of TetraCrete No. 2 White and TetraCrete Additive. It is mixed to a pasty consistency at a ratio of 45 to 50 pounds (20.4 to 22.7 kg) of TetraCrete No. 2 White to one gallon (3.8L) of TetraCrete Additive.
What are the material coverage rates for the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System?
Deck Flex Base Coat: 60 to 75 square feet per gallon. Deck Flex Texture Coat (Trowel Layer): 70 to 85 square feet per gallon. Deck Flex Texture Coat (Spray Layer): 90 to 100 square feet per gallon. Deck Flex Top Coat: 150 to 180 square feet per gallon.
What are the required dry times between coats for the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System?
Deck Flex Base Coat: Must dry for two to four hours. Deck Flex Texture Coat: Must dry for one to two hours.
What are the substrate requirements for the Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System?
The Deck Flex W.F. Walking Deck & Roof Covering Waterproofing System is evaluated for use over exterior-grade plywood and concrete decks. Plywood substrates must be a minimum of 5/8 inch (15.9 mm) thick. All substrates must be structurally sound, free of contaminants (like water, paint, bond breakers), free of projections or depressions, and sloped for proper drainage. All plywood joints must be over framing members or blocked with minimum 2-by-4 blocking. For detailed specifications, see our technical specifications page.
Technical Documentation
ICC-ES ESR-3672 Report
Class B fire rating certification and code compliance
Learn about AC39 Acceptance Criteria
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