Roof Coating Case Study -
Gravel Roof

This case study shows what a typical gravel built up roof looks like when it is twelve to fifteen years old, and then after an American WeatherStar polyurethane foam and elastomeric coating system is installed.

First, all the loose gravel on the roof is removed and then the roof is completely cleaned. In this case, both were accomplished both by wet-vacuuming the roof. This ensured the polyurethane foam will adhere to the roof substrate. The foam was sprayed on the roof at a minimum of 1 1/2 inches to seal the entire roof area. Special care is taken around parapet walls and penetrations to make sure there was a tight seal.

After the foam was installed, two coats of a durable, expandable AWS top coat was applied to protect the foam from the sun's damaging ultraviolet rays. Options include WeatherStar Acrylic 211 on roofs with a positive draining slope and on flat roofs that don't drain water well, we recommend either the WeatherStar Urethane 520 or WeatherStar Silicone 410. Without the top coating, the foam would quickly break down. This foam and coating system not only gave the building owner an outstanding waterproof solution, but also an R10 insulation value for his building.

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