[LinuxBender]

I don't know all the details, but I do know it's only been a legal requirement for businesses in California and only since 2008. There are probably criteria that include/exclude buildings, but that is just a guess. There are no legal requirements to do this for homes. Also just a guess, but if there are no legal requirements to do it, roofers will use what is easiest to get, most abundant and most commonly used to remain competitive. Armstrong sells a white insulated foam roof for homes but it costs more. My neighbor said it pays for itself so I think they agree with you.

[ajoy]

Never heard of foam roofing. Sounds like a great idea!

[LinuxBender]

I watched them put it on. They put a frame around the roof, sprayed it on, then after a bit sprayed on a reflective coating. After a tiny bit they left. It was really fast. This was on a flat roof. It's probably slower on sloped roofs.

[ajoy]

Cool. I think I have seen it on commercial flat rooftops. Haven't seen it on residential roofs.