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R-30 good

Posted by Dave 225 on March 2nd, 2001 01:36 PM
In reply to Double Insulation? by Joe on March 2nd, 2001 10:05 AM [Go to top of thread]

R-30 is a very respectable level of insulation. (It's twice as good as R-15, as you might have guessed.)

R-30 is about as high as you could get - you could add rigid foam insulation which might get you up to R-45 - I would guess (without doing any scientific polling) that most homes have R-15 to R-20 insulation values.

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