ROOF DECK
Roof Deck Waterproofing & Coating Systems
What Is a Roof Deck System?
A roof deck waterproofing system is a traffic-bearing assembly designed to prevent water intrusion into occupied space below while providing a durable, walkable surface above.
For multifamily and commercial projects, the right system must manage moisture, support long-term performance, and meet the demands of the deck’s intended use.
Membranes vs. Coating Systems
When evaluating roof deck waterproofing, it is important to distinguish between systems designed only to shed water and systems built to function as finished walking surfaces.
Roofing membranes:
- • Designed to shed water
- • Not intended for foot traffic
- • Often require additional protection layers
Traffic-bearing coating systems:
- • Engineered for pedestrian use
- • Provide waterproofing + surface durability
- • Deliver a finished, walkable surface
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Westcoat systems fall into the second category, offering integrated waterproofing and wear resistance.
Best Roof Deck Coating Systems
For multifamily roof decks and commercial applications, systems must handle:
- • continuous foot traffic
- • moisture exposure
- • structural movement
Westcoat’s ALX Pro and MACoat systems are designed to meet these requirements based on substrate and performance needs.
Why ALX Pro and MACoat?
ALX Pro and MACoat are the systems specifically suited for traffic-bearing roof decks over occupied space. At Westcoat line,we designed them not just to waterproof, but to deliver reinforced protection, surface durability, and a finished look appropriate for multifamily and commercial environments.
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Roof Deck
Recommended Systems
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ALX™
Learn Morekey features
- IAPMO Evaluated ER-587
- Meets Class A Fire Test ASTM E-108
- Meets One-Hour Fire Rating ASTM E-119
- City of Los Angeles LARC and LABC
- Complies with Wildland Urban Interface Requirements
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ALX™ Solar Reflective Finish
Learn Morekey features
- Meets California Title 24 Requirements
- Lowers Surface Temperature
- CRRC Rated
- IAPMO Evaluated ER 587
- Meets Class A Fire Test ASTM E-108 and One-Hour Fire Rating ASTM E-119
- Class I Vapor Retarder ASTM E96 option
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ALX™ Pro
Learn Morekey features
- Additional Fiberlath Reinforced Membrane
- IAPMO Evaluated ER 587
- Meets Class A and One-Hour Fire Rating
- Class I Vapor Retarder ASTM E96 option
- Optional 20 Year Warranty
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ALX™ Pro Solar Reflective Finish
Learn Morekey features
- Meets California Title 24 Requirements | CRRC Rated
- Lowers Surface Temperature
- Additional Fiberlath Resin Reinforced Membrane Layer
- IAPMO Evaluated ER 587
- Meets Class A Fire Test ASTM E-108 and One-Hour Fire Rating ASTM E-119
- Class I Vapor Retarder ASTM E96 option
- Extended 20 Year Warranty
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ALX™ & ALX™ Pro Waterproofing Underlayment
Learn Morekey features
- Excellent Sound Reduction Qualities
- IAPMO Evaluated ER 587
- Waterproofing System That Can Receive Concrete, Tile or Stone
- Optional Fiberlath Reinforcement
- Cost-Effective
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MACoat™
Learn Morekey features
- IAPMO Evaluated ER 587
- Class A Fire Rating (over concrete)
- Meets AC-39 Standards for Walking Decks
- Class 3 Permeable Vapor Retarder
- Flexible
- Standard and Custom Colors Available
- Optional Skid Resistant Texture Can Be Applied
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MACoat™ Waterproofing Underlayment
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- Flexible
- Durable
- Fast Access After Installation
- Environmentally Safe Acrylics
- Designed For Under Tile and Between Slab Applications
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MACoat™ Solar Reflective Finish
Learn Morekey features
- IAPMO Evaluated ER 587
- Meets California Title 24 Requirements | CRRC Rated
- Helps Reduce the Urban Heat Island Effect
- Lowers the Surface Temperature
- Flexible
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Shur Deck™
Learn Morekey features
- IAPMO ER-517
- Class A Fire-Retardant
- One-Hour Fire Resistance
- Meets 2023 LABC and LARC
- Meets W.U.I Requirements
- Meets SFM 12-7A-4 Parts A & B
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Mer-ko®
Learn Morekey features
- IAPMO ER-517
- Class A Fire-Retardant Roofing System
- One-Hour Fire Resistance Rating
- Class I Vapor Retarder
- Meets 2023 LABC & LARC
