Deck Flex

Waterproof Deck Coating Systems & Specialty Coatings

ICC-ES listed waterproof deck coating systems for walking decks & roof coverings. Manufactured in the USA for over 30 years.

For Architects & Engineers

CSI 3-part specifications for the ICC-ES listed (ESR-3672) Deck Flex WM and Deck Flex WF deck waterproofing systems for both plywood and concrete surfaces.

CSI Specifications

Get to know our professional deck waterproofing systems and specialty coating products. Whether you are looking to waterproof a plywood deck over a living area or resurface your commercial roof with an energy-saving elastomeric roof coating, we're here to help. If your project needs more protection, our fire-rated ICC-ES listed plywood deck waterproofing systems featuring the TetraCrete® cementitious system will beautify and protect for years to come. Our Deck Flex walking deck & roof covering waterproofing systems meet local and international building codes on both plywood and concrete surfaces.

Waterproof Deck Coating Systems & Specialty Products

Deck Flex W.M. Walking Deck & Roof Covering System

Deck Flex W.M. Walking Deck & Roof Covering System

Class A Fire Rated waterproofing system for plywood and concrete decks. ICC-ES listed for building code compliance.

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Deck Flex W.F. Walking Deck & Roof Covering System

Deck Flex W.F. Walking Deck & Roof Covering System

Class B Fire Rated waterproofing system. Perfect for residential and light commercial applications.

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Deck Flex Elastomeric Deck Paint Top Coat

Deck Flex Elastomeric Deck Paint Top Coat

A durable, flexible elastomeric coating designed for deck surfaces. Provides excellent waterproofing and UV protection.

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Elastomeric Roof Coating (T2424)

Elastomeric Roof Coating (T2424)

Energy-saving elastomeric roof coating. Meets Title 24 requirements for commercial roofing applications.

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All-Purpose Protective Sealer

All-Purpose Protective Sealer

Waterborne industrial sealer that protects various surfaces from water, chemicals, and solvents. 400 sq. ft. coverage per gallon.

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We focus on a core set of offerings that have been tested and are trusted by contractors, property managers, homeowners, engineers and architects. These walking deck & roof covering systems and deck coatings are designed to be long-lasting, economical, easy-to-use, and environmentally-friendly. We also create self-contained deck paint kits and other products through our best deck paint or Title 24 roof coating website. We have also partnered with US Made Supply to distribute select products.

Deck & Roof Covering Systems

Specialty Coatings

Multifamily deck waterproofing Professional deck coating

Need Guidance?

Not sure which product or system is right for your project? Email, call or text us at (888) 929-8624 anytime for help. You can also learn more about elastomeric coating application methods in our partner's guide.

Waterproof Deck Coating FAQs

What is deck waterproofing?

Deck waterproofing is a protective system applied to walking decks, balconies, and roof decks to prevent water from penetrating the surface and damaging the structure below. Professional deck waterproofing systems typically include multiple layers—a base coat, waterproof membrane, and protective topcoat—that work together to create a seamless barrier against moisture, UV rays, and foot traffic.

What is the best waterproof deck coating?

The best waterproof deck coating depends on your application. For plywood decks over living spaces requiring complete waterproofing and fire ratings, ICC-ES listed multi-layer systems like Deck Flex W.M. (Class A fire-rated) or W.F. (Class B fire-rated) are the best waterproof deck coating choice. These waterproof deck coating systems have been independently tested for waterproofing performance, durability, and code compliance. For simple moisture protection, an elastomeric coating may work, but won't provide the same level of protection as a true waterproof deck coating system.

How long does deck waterproofing last?

Professional multi-layer deck waterproofing systems typically last 15-20 years or more with proper maintenance. Basic deck coatings and sealers may need reapplication every 2-5 years depending on traffic, climate, and UV exposure. ICC-ES listed systems often come with manufacturer warranties of 10 years when applied by certified contractors.

Do I need a permit for deck waterproofing?

In many jurisdictions, yes—especially in California where SB 721 and SB 326 mandate inspections and repairs of exterior elevated elements. Permit requirements vary by location, but waterproofing work on balconies over living spaces or roof decks typically requires permits. Using an ICC-ES listed system simplifies the permit process because it provides the code compliance documentation building officials need.

What's the difference between deck coating and deck waterproofing?

Deck coating is a general term for any protective finish applied to a deck surface, including paints, stains, and sealers. Deck waterproofing specifically refers to systems designed to completely prevent water penetration—critical for decks over living spaces. A basic deck coating may provide moisture resistance, but only a true waterproofing system with a seamless membrane can prevent leaks into the structure below.

Can I apply a waterproof deck coating myself?

Basic waterproof deck coatings like elastomeric sealers can be DIY-applied on simple decks. However, multi-layer waterproof deck coating systems designed for decks over living spaces or requiring fire ratings should be professionally installed. Proper surface preparation, correct material mixing, and precise application are critical for these systems to perform as tested. Most ICC-ES listed waterproof deck coating systems require certified contractor installation to maintain warranty coverage.

Technical Resources & Guides

Understanding ICC-ES AC39

Learn about the acceptance criteria for walking deck systems and why ICC-ES evaluation matters for code compliance.

Fire Ratings Explained

Understand Class A vs Class B fire ratings, ASTM E84 testing, and when each rating is required.

What is Elastomeric Roof Coating?

Complete guide to elastomeric coatings—benefits, types, energy savings, and application methods.

California SB 721/SB 326 Compliance

Requirements for balcony inspections and waterproofing repairs in California multi-family buildings.