The 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 foam is installed in order to protect the foam from the suns ultraviolet rays, the Dealer applies two coats of a WeatherStar top coat. Options include Acrylic 210 or Acrylic 211 on roofs with a positive draining slope. On flat roofs that don’t drain water well, we recommend either the Urethane 520 or Silicone 410. Without the coating, the foam would quickly break down under UV rays.

The foam and WeatherStar Coatings system not only gives the building owner an outstanding waterproof solution, it also adds an R10 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.