[Greenbuilding] Unifoam vs Plastispan
Lynelle Hamilton
lynelle at lahamilton.com
Tue Oct 3 21:49:39 CDT 2017
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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