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Posted by Wayne Whitney on June 13, 2008, 3:21 pm
> I did some googling, I like the closed cell foam a lot, but it is
> about 2 lbs/ sq ft. That's going to add an additional 600 lbs to my
> ceiling if I pack the joist cavities completely.
So your ceiling is 300 ft^2. The density of closed cell foam is
typically 2 lbs/ft^2, so you'd be applying it 12" thick? That's way
overkill, and the cost of 300 ft^3 of foam would be something like
$3000. You might consider applying it 2" thick. Be sure to use a
fire-rated foam (ASTM E-84).
Cheers, Wayne
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