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I have extra R19 insulation batts (designed for a 2x6 bay)--should I use them in a 3.5" stud cavity, or does compressing them that much make them less effective than R13 batts in the same space?

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R-13, will be. When R-19 is cramped in the same space, it is still R-13. R-19 will be a waste of money.

Use spray foam in the bays to achieve R-19.

Use your extra R-19 in the attic if possible, pull the paper off and layer it over the other insulation, if you have access.

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  • "Fluffy, not stuffy", was always the mantra when installing insulation... Sep 15 '15 at 14:18

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