SPF can be used as a roofing system when used with an elastomeric coating for UV proection. Also, lighter weight foams are used for insulating houses. I did not watch the video, but I look to start into the SPF business within the next couple of years. I have spoken to a few in the business, and have been doing some research, but am far from an expert.
From what I understand the A side is the polyurethane and the b side is the blowing agent. Different blowing agents are supposed to produce different weight foams. The polyurethane, according to Mr. Thomas Hay, would be the strongest superglue you ever saw without the blowing agent. I heard that his company had multiple hurricanes go over 27 of their buildings and no wind damage was evident to any of them (aside from flying debris, I would assume).
I am hip to this stuff, and was even going to buy Mr. Tom's business and relocate him to Chicago, but somebody down there beat me too it.
