[Greenbuilding] Crawlspace foam insulation -- how much?
Frank Tettemer
frank at livingsol.com
Fri Jun 12 13:18:12 CDT 2015
Hi Leslie,
You may want to re-consider the idea of foaming the floor in a crawl
space. My concerns would be that the foam would act too well as a vapour
barrier, and you may have moisture/mildew problems down the road in the
crawl space. I AM in Canada, so your geographic climate might create
different problems than here.
I always design any neccessary crawl spaces as a definite part of the
conditioned space of the home. That means insulating the walls and the
floor of the crawl space, and leaving the floor as a vapour-open plane,
as well as including the crawl space in the heating design. This avoids
condensation trouble, by keeping the air warm and dry.
Frank
Frank Tettemer
Living Sol ~ Building and Design
www.livingsol.com
613 756 3884
On 12/06/2015 2:02 PM, Leslie Moyer wrote:
> I am in NE Oklahoma. I'm in the process of getting estimates for
> crawlspace insulation in the floor joists--closed cell foam. My crawl
> space is dry now that we've fixed some plumbing problems, but I'm
> having some cupping issues with some wood flooring and part of the
> fiberglass batts that were originally in the house when we bought it
> were taken out over time for this and that. Anyway--closed cell foam
> seems to be the best solution.
>
> The first guy who came this morning wants to quote me 1.5" foam,
> though said he would quote 2" if that's what I really want, saying
> that would be enough for "Canada". I understand about the benefits of
> air sealing, but I was still thinking I would need more inches of foam
> according to what I've read on R-value & this area. Thoughts?
>
> --
> *Leslie Moyer*
>
>
>
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