Updated on July 8th, 2021
By: Steve MaxwellTo create a properly insulated floor, you really should have at least R15 worth of insulation, and that’s about three inches worth of foam to achieve this. More is better. Instead of building up this much spray foam alone, you’ll save quite a bit of money by cutting two-inch-thick pieces of rigid foam to fit between the floor joists, then applying spray foam over top to seal everything. You can easily spray this yourself, using one of the two-part spray foam systems designed for do-it-yourself application. I’ve had good results with Tiger Foam (888.844.3736).
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