[Greenbuilding] Crawlspace foam insulation -- how much?

[Leslie Moyer]

Yeah, well, I considered that option first and was ridiculed for that on 
this list several months ago. My crawl space is tight (for humans), but 
well-ventilated, so I'm going to go with this option as I think it is 
the most practical.

--Leslie

On 6/12/15 1:18 PM, Frank Tettemer wrote:
> 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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>


-- 
*Leslie Moyer*
Email: unschooler at lrec.org <mailto:unschooler at lrec.org>
Phone: (918) 772-6150
Cell: (918) 633-8820

Sustainable Tahlequah
Web: SustainableTahlequah.org <http://www.SustainableTahlequah.org/>
Discussion List: groups.yahoo.com/group/SustainableTahlequah 
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