Well, we just had a bunch of work done in our condo building, and we passed on Icynene. Ours is a strange marriage of a 19th century building to a 21st century addition. When it was condo'd about 10 years ago, the contractor took every conceivable shortcut. The contractor we hired to make some repairs tried hard to sell me on changing our cold roof to a hot one, using Icynene and I ultimately put the kybosh on it. Sure it can be done well, but it isn't easy to retrofit into a funky space and since I didn't have 100% confidence in the guy, I figured better safe than sorry. Henri de Marne wrote an article touching on the issue for The Journal of Light Construction 10 or so years ago. I'm pretty sure it's archived on TIJ. It's worth reading, especially because he works in VT, a similar climate to mine. Maybe I'm just too stubborn, unenlightened, and prejudiced, but I couldn't justify the risk of getting it wrong on this one. Plus, it's expensive and we'll be moving shortly. Even if it worked out just fine, we wouldn't break even on the outlay of cash. Jimmy