Adding attic Insulation-how much extra?


Old 10-02-05, 07:59 AM
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Adding attic Insulation-how much extra?

I have R-11 faced & appx 4 inches of blown.

I am told that adding R-30 might be wasting my $ ,as there becomes a point when its no longer effective.

How much extra should I add ? R-13 or R-20


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Old 10-02-05, 09:55 AM
Join Date: Apr 2005
Location: WA
Posts: 117
Depends where you live.

As you add more, the savings definately minimizes. Recommended ranges from R13 to R40.

There should be some posts in the forum with a link to the DOE's recommended amts based on region.
Old 10-02-05, 07:16 PM
Join Date: Aug 2000
Location: USA
Posts: 15,834
Go to to learn about insulation. Click the Insulation Calculator and submit your ZIP for recommendations for amount of insulation.

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