Two Systems from Westcoat Combat Moisture Issues

Dark and light areas of thisconcrete overlay give a geometric look to the space MACoat by Westcoat

Second-story decks are popular outdoor spaces in both residential and commercial buildings. But, unless there is some sort waterproofing in place, the space underneath is essentially useless. Weather, over time, can even destroy it. In order to help combat moisture problems, Westcoat Specialty Coating Systems offers two popular and proven waterproofing coating systems: ALX and MACoat.


ALX is specially designed for application over plywood substrates. With that in mind, the coating includes a reinforced galvanized metal lath. The lath only weighs 2.5 pounds per square foot.

ALX can also be used for interior applications as a decorative topping designed to resurface a plain plywood subfloor into a decorative, water-resistant, concretelike finish. It can be used for living areas, lobbies, offices, restaurants and hotels or wherever a thin, decorative and durable floor finish is desired over plywood.


MACoat on the other hand, is designed to be applied over concrete surfaces. It uses a fiber lath for reinforcement and as a result is very lightweight.

Despite their obvious differences, the two coatings are pretty similar, according to their manufacturer. “From a performance standpoint, they do the same thing,” says Matt Ranzau, a sales representative for Westcoat who specializes in waterproof coatings.

An overlay on a deck next to a railing that overlooks an expansive water view. ALX by Westcoat

Both systems provide barriers to moisture by utilizing layers of acrylic resins and cement blends, with layers applied in steps. Ranzau lists three main advantages they have compared to polyurethane coatings:

  • Environmentally friendly
  • Fast-drying
  • Offer a variety of decorative finishes.

“Westcoat waterproof deck coatings can be made to look like tile, slate or flagstone, and in any color you can imagine,” he notes. “ALX and MACoat not only offer outstanding waterproofing capabilities but also enhance the look of balconies, walkways, decks and other high-traffic areas.”

You can only apply these product between the temperatures of 55 F and 95 F. Additionally, depending on temperature, each layer takes two to six hours to dry. You can also open up the surface to pedestrian traffic for use between coats.

For contractors who are familiar with resurfacing methods, applying ALX or MACoat is a fairly standard job.

“Many of the components in our waterproof systems are what a lot of resurfacing contractors are already using,” Ranzau says. “The systems are going to have a familiarity that will result in an easier installation and potentially better profit margin.”

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