Does anyone know how the foam roof recoating is actually done? Is it just a new layer of foam and/or coating applied over the existing foam, or is generally a part of the old roof stripped off prior to re-coating?
It is a protective coating applied over the existing foam (it is not foam, but a different material designed to protect the roof from UV damage). They pressure wash the roof, let it dry, then apply the coating.
While on the subject of foam roofs - -- I noticed a fair amount of either crushed rock or large salt-like particles washing off our foam roof (onto perimeter concrete) during the current South Bay rain season. The roof was installed by Able about 3 years ago when they were a reputable firm.
Cathye, renman, others, what is this and is this normal??
It is probably the calcium carbonate that is washing off. Able and some other foam companies use this as the final layer over the foam roof and top coat, to increase it's reflectivity. The purpose is to give it better insulating properties in hot weather, by bouncing the sun's rays back and away from your roof--more than just having a white foam roof would do.