Condensing Insulation


Old 09-28-05, 05:25 PM
Thread Starter
Join Date: May 2004
Posts: 80
Condensing Insulation

If we have insulation that is designed for 2 x 6's that is R19 in it okay to snug it in place (condensing the insulation) to fit in 2 x 4's? I realize that if you squish insulation in a tight space the R-value is lowered. Thanks!
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Old 09-29-05, 04:50 AM
Join Date: Jul 2005
Location: Ottawa, Canada
Posts: 857
For the insulation to function efficiently, it cannot be condensed. If you compress it, or if the drywall compresses it, then it will no longer function as it was designed.

You are better off installing R-13 which is designed for 2x4s.
Old 10-02-05, 07:35 AM
Thread Starter
Join Date: May 2004
Posts: 80
Okay thanks, we'll get the right kind.

Also does the ceiling really require a huge R-value compared to the rest of the walls?

Last edited by electric1; 10-02-05 at 09:46 AM.
Old 10-02-05, 09:53 AM
Join Date: Apr 2005
Location: WA
Posts: 117
Depends entirely on where you live.
Search this forum for similar questions.

You'll see the recommended ceiling insulation ranges from R13 to R40 depending on climate.
Old 10-02-05, 07:17 PM
Join Date: Aug 2000
Location: USA
Posts: 15,834
Go to to learn about insulation. Click the Insulation Calculator and type in your ZIP for recommended amount of insulation in your area.

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