[Greenbuilding] Unifoam vs Plastispan

[Lynelle Hamilton]

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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