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Old 01-03-2011, 02:55 PM   #1
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Fiberglass insulation rolls for flooring?

Is there any reason why fiberglass insulation rolls can't be used as flooring insulation? I noticed they're higher in R factor than insulation boards. I'm thinking of laying a barrier, laying a R13 or more rolls down with supports to hold flooring material and keep from smooshing the insulation.

Also noticed they're 3 1/2" or more thick. Would it ruin their R factor to compress them a bit? How much compression is too much?
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Old 01-03-2011, 03:21 PM   #2
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Re: Fiberglass insulation rolls for flooring?

Don't compress more than 1/2 of their regular thickness (ie= 3" can be compressed down to 1.5" before you lose so much R value that you are wasting your time and money). Polyiso sheathing (foam board... NOT THAT STYRO FOAM BEAD CRAP) ) has a higher R-Value can hold up to getting wet without losing R Value and will not "shift" over time.
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Old 01-04-2011, 07:30 AM   #3
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Re: Fiberglass insulation rolls for flooring?

Okay, you all win I'll stick to the boards *grumble grumble*
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