<div dir="ltr">Frank, the stone was under 9" of geo foam @ R-4.2, supporting a 4" slab.. <div><br></div><div>still, according to PHPP, there is a lot of impact to the gross modeled result from decoupling the assembly from the subsoil. FWIW, the gravel fill was also encased in vertical </div><div>insulation. So the R-value of the stone may not be trivial...<br></div><div><br></div><div>-aa</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><font size="2"><font size="2"><span style="color:rgb(102,0,0)">Alan Abrams</span></font><b style="color:rgb(102,0,0)"><br></b><i><span style="color:rgb(102,102,102)">certified professional building designer, AIBD<br>certified passive house consultant, PHIUS</span></i></font><div><i><span style="color:rgb(102,102,102)">certified passive house builder, PHIUS</span></i><font size="2"><span style="color:rgb(102,0,0)"><font color="#666666"><i><br></i></font></span></font><font style="color:rgb(102,102,102)" size="1"><font size="2">cell </font></font><font style="color:rgb(102,102,102)" size="1"><font size="2">202-437-8583</font></font><font style="color:rgb(102,102,102)" size="1"><font size="2"><br>
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<br><div class="gmail_quote">On Mon, Dec 7, 2015 at 7:03 PM, Frank Tettemer <span dir="ltr"><<a href="mailto:frank@livingsol.com" target="_blank">frank@livingsol.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I would consider the 24" of gravel as a steady, 24/7 heat loss. In fact, in a colder climate, (like Eastern Ontario, Canada), there would be little consideration of trying to heat that gravel. Any heat going into it from the house would continue traveling down and out, and the heat added to the stone would never return to the house. Unless you opened all the windowsand doors to quickly chill the place. Then for a short while, the cool stones would give offtheir relative heat to the room.<br>
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In other words, dee-coupling from the stones, with at least R-25 insulation, would be a Good Idea. If you were a Passiv Haus enthusiast, you would insulate with R-45 or more, to prevent heat loss to those stones.<br>
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Frank Tettemer<br>
Living Sol ~ Building and Design<br>
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On 07/12/2015 5:26 PM, Norbert Senf wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
Right, I was only addressing the "heat capacity expressed as MJ(m^3K)" part of the question. R value of gravel is a look-up value............N<br>
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On Mon, Dec 7, 2015 at 2:42 PM, Nick Pine <<a href="mailto:nick_pine@verizon.net" target="_blank">nick_pine@verizon.net</a> <mailto:<a href="mailto:nick_pine@verizon.net" target="_blank">nick_pine@verizon.net</a>>> wrote:<br>
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<br>
Norbert Senf <<a href="mailto:norbert.senf@gmail.com" target="_blank">norbert.senf@gmail.com</a><br></span><span class="">
<mailto:<a href="mailto:norbert.senf@gmail.com" target="_blank">norbert.senf@gmail.com</a>>> writes:<br>
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... the specific heat would be .14 MJ/m3-K<br>
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I'm afraid that has nothing to do with R-value.<br>
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Nick<br>
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