What is the best way to insulate a crawlspace for a more comfortable hardwood floor above in climate zone 5?
I am in Northern NJ, climate zone 5, and have a crawlspace question that I have been debating with a colleague (ok....my boss).
I have a 600 sq ft addition with a cold hardwood floor that is over a vented crawlspace. The crawlspace has leaky, poorly insulated duct work for the forced air heating/cooling running through it. There is currently poorly installed R-19 fiberglass pinned into the joist bays, attempting to insulate the floor above. The crawlspace floor is dirt with a poorly installed 6 mil poly liner in place. The crawlspace walls are about 3' high.
The question, as always: to insulate the ceiling or the walls?
The boss wants to remove the existing FG and spray foam the underside of the floor, then close down the crawlspace vents.
I want to spray foam the walls, install a better poly liner, and drop a supply register in the crawlspace to make a conditioned crawlspace.
The boss thinks spray foaming the walls will still allow for too much cold to radiate up from the dirt floor, and that addressing the walls will not adequately address the comfort issue on the hardwood floor above.
Posted Jan 13, 2011 9:04 PM ET
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