[Greenbuilding] Unifoam vs Plastispan

[Gennaro Brooks-Church - Eco Brooklyn]

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> 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>
> 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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