My 600 square foot workshop (built by a previous owner) had numerous small air leaks in the ceiling that I was not able to find and seal. So I pulled out the fiberglass, had about 4 inches foam blown in, then blew in 2 feet of fiberglass on top.
Result is the air leaks are absolutely, positively sealed and I have an R80 ceiling.
The foam cost about $1500. I got a deal from a guy that cut the price to get the order. He was starting a foam business.
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