Remove Foam Insulation first?


Old 04-24-08, 08:12 PM
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Question Remove Foam Insulation first?

I am thinking of adding foam insulation to my attic/crawl space. I live in AZ and according to the US Dept of Energy I should use R49. According to my original home inspection, the crawl space has 8.5" of R30. To get the most energy efficent return, should I remove the existing before adding new R49?
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Old 04-28-08, 01:04 PM
connie's Avatar
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Hi Autumn,

I think you could just add a layer of R-19 on top of your R-30.

Just pull the vapor barrier, or, if you haven't already purchased, buy unfaced R-19.

Old 04-28-08, 05:59 PM
airman.1994's Avatar
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NO foam! You should lay new battes on top of youe R-30 as connie said!
Old 04-28-08, 07:41 PM
XSleeper's Avatar
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I think he is saying he has 8.5" of foam already... and wants to know if it ok to add a few more inches of foam to reach R-49 (another R-19).

Provided both foam products are similar, I don't see the problem with adding more.
Old 04-29-08, 02:21 PM
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If he has 8.5 in of closed cell foam he has R59.5 now

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