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Old 10-20-2020, 01:30 PM   #3108
topfiverecords
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That's good in theory, a few inches will give you R-18 but doesn't really solve it.

Breaking the thermal bridging is important and for good reason is why code now requires rigid under cantilevers. 2-3 inches of R5/inch rigid board under an R-31/R40 batt is a better choice.

On new construction the best method is a warm airspace between the insulation and the subfloor.
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