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Boffa

03:53AM | 03/09/04
Member Since: 11/11/03
6 lifetime posts
Bvhvac
The crawl space under my house is insulated with a single layer 3.5 inches of fiberglass between the joists. I want to upgrade the insulation. I was thinking of rigid foam bonded to foundation walls and across the joists. Any suggestions?

homebild

06:53PM | 03/13/04
Member Since: 01/28/03
693 lifetime posts
Waht you suggest is one option but you may be better off insulating the walls and floor fo the crawlspace with foam to achieve and even greater insulating capacity.

juliedealer

08:33AM | 03/25/04
Member Since: 03/23/04
71 lifetime posts
Homebild, how owuld you suggest insulating the cinder block that make the walls of the crawl space? I know you said foam, but what type?

homebild

12:51PM | 03/27/04
Member Since: 01/28/03
693 lifetime posts
Rigid foam (4'x8' sheets...1-2inches thick)on the inside or outside of the block will usually give a drier and warmer crawlspace or basement than just fiberglass in the joists alone.

Foam can be glued/nailed to the foundation block.

juliedealer

03:41AM | 06/16/04
Member Since: 03/23/04
71 lifetime posts
How do you get that rigid foam thru that tiny crawlspace entrance?

homebild

09:42PM | 06/18/04
Member Since: 01/28/03
693 lifetime posts
Increase the size of the opening or cut the rigid sheets.
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