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

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.