[Greenbuilding] Unifoam vs Plastispan

[Norbert Senf]

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> 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> 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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-- 
Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com
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