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<p><font size="+1"><font face="Gill Sans MT">Hi John, <br>
</font></font></p>
<p><font size="+1"><font face="Gill Sans MT">The engineer is very
specific about the 30psi under the edge. He initially wanted
it under the slab as well, but did switch that spec. </font></font><br>
</p>
<br>
<div class="moz-cite-prefix">On 2017-10-03 6:59 PM, John Straube
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:585F9820-D388-4F9D-AAF7-4FBAEAFF2EA6@gmail.com">
<pre wrap="">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?
</pre>
<blockquote type="cite">
<pre wrap="">On Oct 3, 2017, at 6:24 PM, Lynelle Hamilton <a class="moz-txt-link-rfc2396E" href="mailto:lynelle@lahamilton.com"><lynelle@lahamilton.com></a> 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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