[Greenbuilding] Unifoam vs Plastispan

[Norbert Senf]

Hi Lynelle:
I don't know. There is no heating downward if it is well insulated, so cold
would be leaking in around the perimeter, depending on the snow cover. If
it was bare ground, it could be substantial. With snow cover up here near
Ottawa, we often have no frost in the ground. A driveway can have 6ft of
frost some years.

We have an uninsulated floor in our basement, about 4 ft below grade,
insulated basement walls, with snow cover on 3 sides, and the floor is
around 50F plus or minus 2 degrees, year round.

On Tue, Oct 3, 2017 at 10:49 PM, Lynelle Hamilton <lynelle at lahamilton.com>
wrote:

> 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> 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 <(819)%20647-5092>
> www.heatkit.com
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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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