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What R-Factor should I consider use when insulation our crawlspace?

The floor under our new crawlspace was not insulated. The space between the floor joists is about 15 inches and the depth seems to be at least 12. The crawlspace is partially exposed concrete from the old patio and gravel over part of the original back yard. The space height of the crawlspace is roughly 4 feet. And the foundation wall was insulated with R19 insulation. Do we use the same between the floor joists?

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1 Answer from this member:
Manage My Life
by Manage My Life
November 13th, 2008
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