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Posted by Jay J -Moderator on April 4th, 2001 12:31 PM
In reply to insulation? by tigerstripe on April 4th, 2001 09:53 AM [Go to top of thread]

1 of 1 people found this post helpful

Hi tigerstripe,

I'm sorry to disagree but, for example, blown in fiberglass/cellulose insulation needs to be about 12-14" thick to have a rating of R-30. Hence, if your joists are 10", then you'll end up compressing the mix, thus, dramatically reducing the R-factor.

If you're referring to R-30 rolled fiberglass insulation, then you're right. In this case, it's as 'thick' as the joists and you'd be correct. I guess all you need to realize is that insulation comes in a LOT of forms, including spray foam.

I'll assume you either don't understand or fully understand what 'R-factor' means. Once you do, you'll certainly understand what COMPRESSION does to the R-factor. My best to ya and hope this helps.

Jay J -Moderator

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