CASE STUDY

Gravel Built Up Spray Foam & Roof Coatings Restoration

The AWS approved Dealer first takes off all the loose gravel on the roof and thoroughly cleans the substrate. In this case he accomplishes both by wet-vacuuming the roof. This ensures the polyurethane foam will adhere to the exiting roof substrate. We always recommend a moisture survey before installing foam to ensure a successful job. If moisture is found in existing roofing system, the contractor will remove wet areas before installing polyurethane foam.

The foam is 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 is a tight seal.

After the spray foam is installed, in order to protect the foam from the sun's ultraviolet rays, the Dealer applies two coats of a WeatherStar Roof Coatings top-coat. Options include Miami-Dade County approved AWS Acrylic 211 on roofs with a positive draining slope and on flat roofs that don’t drain water well, we recommend either AWS Urethane 520 or Miami-Dade County approved AWS Silicone 410. Without the coating, the foam would quickly break down under UV rays.

The WeatherStar Foam and Roof Coating system not only gives the building owner an outstanding waterproof solution, it also adds an R-10 insulation value for his building. (Foam sprayed at 1.5”)

For more information, see the application specifications on this system or call American WeatherStar at 800-771-6643.