[Greenbuilding] Unifoam vs Plastispan

[Lynelle Hamilton]

Thanks, John.

Frost protected shakkow foundation, yes. but not t a purchased "system" 
for cost and delivery time issues. Am planning to construct my own, Soil 
is a mixture of sand and sandy loam. Land around me is damp, although 
the previous cottage had a crawl space that was dry.  Those are the 
concerns with regard to insulation. Because the perimeter (and a centre 
"channel" that is to support an interior load bearing  wall have to be 
30psi, I will glue a 25 psi skirt around the perimeter, with additional 
width at each corner.

Lynelle


On 2017-10-03 11:00 PM, John Salmen wrote:
>
> Depends on perimeter depth. Are you doing a frost protected 
> foundation? Or are the footings below freezing and fully wrapped? 
> consideration on the perimeter and bridging. I’ve typically gone R20 
> on slab but R30 on perimeter.
>
> *From:*Greenbuilding 
> [mailto:greenbuilding-bounces at lists.bioenergylists.org] *On Behalf Of 
> *Lynelle Hamilton
> *Sent:* Tuesday, October 3, 2017 7:50 PM
> *To:* greenbuilding at lists.bioenergylists.org
> *Subject:* Re: [Greenbuilding] Unifoam vs Plastispan
>
> Norbert, is the 50F true when the slab is shallow (e.g. essentially on 
> packed earth that is 16" below grade?
>
> Lynelle
>
> On 2017-10-03 7:19 PM, Norbert Senf wrote:
>
>     Way high. If you do a payback analysis for the last R-10 it is
>     close to infinite. Ground temperature around here is 50F, so your
>     maximum differential is maybe 20 degrees ............... N
>
>     On Tue, Oct 3, 2017 at 7:11 PM, Gennaro Brooks-Church - Eco
>     Brooklyn <info at ecobrooklyn.com <mailto:info at ecobrooklyn.com>> wrote:
>
>     R-35 under slab is high or low?
>
>
>     Thanks!
>
>     Gennaro
>
>     On Tue, Oct 3, 2017 at 6:59 PM, John Straube <jfstraube at gmail.com
>     <mailto:jfstraube at gmail.com>> wrote:
>
>     I am not sure what is special about your slab, but standard XPS
>     (25 psi max) has been used for decades.  Hence, EPS with more than
>     25 psi seems odd anywhere except where a concentrated load
>     occurs.  Remember, 25 psi is 3500 psf, which is more than most
>     soils can take. But to answer part of the question I have use
>     PlastiFab EPS of wide range of strengths successfully for a long
>     time, and have no experience with Uniform.
>     Of course insulating with R-35 under slab seems very odd… the
>     result of bizarre interior conditions or bizarre calculation methods?
>
>     > On Oct 3, 2017, at 6:24 PM, Lynelle Hamilton <lynelle at lahamilton.com
>     <mailto:lynelle at lahamilton.com>> wrote:
>     >
>     > I am insulating under a floating pad. The engineer has specified 25psi
>     under the slab and 30 psi on outer edges.   I've been looking at
>     two products: Unifoam 25/30 and Plastifab 25/30. Aiming for R35
>     under the slab.  Price differential is significant (Unifoam is
>     nearly $3000 more) for the house.
>     >
>     > Has anyone had experience with either product? From the specs,
>     Unifoam appears to absorb less water and has less deflection, but
>     both are within the ASTM spec for the issue.
>     >
>     > Many thanks for any insights!
>     >
>     > Lynelle Hamilton
>     >
>
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>     -- 
>
>     Norbert Senf
>     Masonry Stove Builders
>     25 Brouse Road, RR 5
>     Shawville Québec J0X 2Y0
>     819.647.5092
>     www.heatkit.com <http://www.heatkit.com>
>
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