Quantcast

Formboard For Crawl Space Question

Help Support House Repair Talk:

Johnny Miller

Member
Joined
Nov 10, 2018
Messages
20
Reaction score
1
Location
Ohio
Looking to put a piece of foam board between the floor joists and then a strip on insulation. So it would be foam board against the sub floor then insulation. Better or worse as far as the insulation properties? A;lo thinking about putting a piece of foam board at the rim joist as well.

Thoughts or is the over kill?
 

Snoonyb

Well-Known Member
Joined
Sep 30, 2006
Messages
4,249
Reaction score
860
Foam board is far easier to stabilize than batt insulation, so I would install the batts, with the vapor barrier toward the conditioned side, and then the foam, without a vapor barrier.
 

oldognewtrick

Administrator
Staff member
Admin
Moderator
Joined
Jul 26, 2009
Messages
11,639
Reaction score
1,804
Location
Nashville, TN
You should be carefull to not create a double vapor barrier. It can trap moisture and create a new set of issues.
 
Top