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Compressing Fiberglass?

Dino's Avatar
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03-01-02, 09:02 AM   #1  
Compressing Fiberglass?

I'm insulating an area of new construction with R-30 (10 1/4") fiberglass. In one area, however, (approx. 100s.f.) the ceiling is framed with 2x8's with a plywood attic floor above. I understand that the air spaces within the spun fiberglass is what gives the system it's insulative value and that compressing it decresses it's R-value. But I'm trying to decide whether to go ahead and use the R-30 throughout and compress the 10 1/4" insulation into the 7 1/4" deep cavity, or whether to use R-25 (8 1/4") in that area. Now that I've written all this out, the answer seems pretty obvious, but what do you think?

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Join Date: Oct 2000
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03-05-02, 08:14 AM   #2  
Use the appropriate size.

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