<div dir="ltr"><div>Hi Lynelle:</div><div>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. <br></div><div><br></div><div>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.<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Oct 3, 2017 at 10:49 PM, Lynelle Hamilton <span dir="ltr"><<a href="mailto:lynelle@lahamilton.com" target="_blank">lynelle@lahamilton.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p><font size="+1"><font face="Gill Sans MT">Norbert, is the 50F
true when the slab is shallow (e.g. essentially on packed
earth that is 16" below grade?</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">Lynelle</font></font><br>
</p>
<br>
<div class="m_-3639612652525027180moz-cite-prefix">On 2017-10-03 7:19 PM, Norbert Senf
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">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<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Oct 3, 2017 at 7:11 PM, Gennaro
Brooks-Church - Eco Brooklyn <span dir="ltr"><<a href="mailto:info@ecobrooklyn.com" target="_blank">info@ecobrooklyn.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">R-35 under slab is high or low?</div>
<div class="gmail_extra"><br clear="all">
<div>
<div class="m_-3639612652525027180m_-8133840847980594306gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>Thanks!</div>
<span class="m_-3639612652525027180HOEnZb"><font color="#888888">
<div>Gennaro<br>
</div>
</font></span></div>
</div>
</div>
</div>
</div>
</div>
</div>
<div>
<div class="m_-3639612652525027180h5">
<br>
<div class="gmail_quote">On Tue, Oct 3, 2017 at 6:59
PM, John Straube <span dir="ltr"><<a href="mailto:jfstraube@gmail.com" target="_blank">jfstraube@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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.<br>
Of course insulating with R-35 under slab seems
very odd… the result of bizarre interior
conditions or bizarre calculation methods?<br>
<span class="m_-3639612652525027180m_-8133840847980594306im m_-3639612652525027180m_-8133840847980594306HOEnZb"><br>
> On Oct 3, 2017, at 6:24 PM, Lynelle
Hamilton <<a href="mailto:lynelle@lahamilton.com" target="_blank">lynelle@lahamilton.com</a>>
wrote:<br>
><br>
> 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.<br>
><br>
> 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.<br>
><br>
> Many thanks for any insights!<br>
><br>
> Lynelle Hamilton<br>
><br>
</span>
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<div class="m_-3639612652525027180gmail_signature" data-smartmail="gmail_signature">Norbert
Senf<br>
Masonry Stove Builders<br>
25 Brouse Road, RR 5<br>
Shawville Québec J0X 2Y0<br>
<a href="tel:(819)%20647-5092" value="+18196475092" target="_blank">819.647.5092</a><br>
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