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<p class=MsoNormal><span style='color:#1F497D'>Rick,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>If you’ll flip your copy
of 90.1 to Appendix A, you’ll find there’s a section for “slab
on grade floors” (not just “floors”), and corresponding table
that will describe the exact construction layers to achieve a target F-Factor.
Matching these slab-on-grade construction layers/insulation will mean you’re
achieving the target F-factor for your perimeter zone(s).<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>From memory, I believe F-0.73 is
a commonly looked up value that corresponds to an un-insulated 6” slab,
but you should review that section/table in its entirety (it’s
small) to confirm. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>There are resources outside 90.1
that will lead you to similar F-factor information, including a paper that
explains how DOE2 handles perimeter insulation that pops up every so often on
this list (sorry not sure where it’s found online), but your Appendix A
bullets out what you need pretty well for this case. I’d suggest
verifying what construction layers Appendix A is suggesting you use, make any
construction modifications that may be necessary in your baseline model, and respond
to your reviewer with your findings and any changes made in response, with
updated results if changes were necessary. Be sure to cite appropriate
90.1 sections where applicable in your written response.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><br>
If the reviewer (not you) is bringing up perimeter/core slab heat loss under
discussion, take care! She/he may be either testing you or otherwise may not
fully understand what F-factors are supposed to represent: a perimeter heat
loss factor. Carefully word your response in a way that demonstrates you
understand this distinction, but don’t turn it into a lecture as an uninformed
reviewer may take offense and unfairly turn the reviewing process against you
and your project.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Best of luck!<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>~Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'> <o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37
id="Picture_x0020_1" src="cid:image001.jpg@01CAF5AD.0A92F170"
alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
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<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
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<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Routh
Consulting Engineers<br>
<b>Sent:</b> Monday, May 17, 2010 10:24 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Floor Slab F-factor<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Could someone please help me with how to input or figure out
what the F-factor is for slab-on-grade floors? I’ve just input floor
areas through the wizard and selected the type of foundation insulation I have
from the drop-down lists. I have received a comment back from the LEED
reviewers to explain what I have and how my baseline case uses the unheated
floor slab F-factor of 0.73. Several of my thermal zones are interior spaces
which have a concrete floor with Earth contact but no exposed perimeter, but I do
have Earth contact floors in all of my zones so there is supposedly heat loss
from all of them. Any help with this would be appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Rick Routh<o:p></o:p></p>
<p class=MsoNormal>Routh Consulting Engineers, Inc., P.S.<o:p></o:p></p>
<p class=MsoNormal>P.O. Box 3187<o:p></o:p></p>
<p class=MsoNormal>Pasco, WA 99302<o:p></o:p></p>
<p class=MsoNormal>(509) 547-8262<o:p></o:p></p>
<p class=MsoNormal>(509) 542-0650 FAX<o:p></o:p></p>
<p class=MsoNormal>routhconsultingengineers@charter.net<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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