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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I believe the concern is the transfer of heat between different materials. I can’t remember where I saw it, but there was a table showing the transferring heat
between base and finish materials, say tile to concrete slab below in passive solar conditions and the rate of transfer was much less than one might think. The joint between the two impeded the heat transfer, in other words. I would think an acrylic additive
may impede the transfer even more. The best is always to not cover the slab, only color it, if heat retention in the slab is the goal.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Rob Vadurro, AIA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Park Architect<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">New Mexico State Parks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">1220 South Saint Francis Drive<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Santa Fe, NM 87505<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">505-476-3383<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">505-476-3361 fax</span><span style="font-family:"Baskerville Old Face","serif";color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> Greenbuilding [mailto:greenbuilding-bounces@lists.bioenergylists.org]
<b>On Behalf Of </b>Topher<br>
<b>Sent:</b> Monday, May 13, 2013 8:39 AM<br>
<b>To:</b> Green Building<br>
<b>Subject:</b> Re: [Greenbuilding] Passive solar home--concrete overlay re thermal mass<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 5/13/2013 1:07 AM, KTOT (g) wrote:<o:p></o:p></p>
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<p class="MsoNormal">Does anyone have experience or knowledge about this? Using or not using a concrete overlay product for the top layer of a floor for thermal mass, vs. a plain darkly stained concrete slab
<o:p></o:p></p>
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A concrete overlay product is likely to be roughly similar in thermal characteristics to a concrete slab. Meaning that you will just have a thicker thermal mass. It seems unlikely that you should be worried about
<i>too much</i> thermal mass in a passive solar house. The overlay product might have a lower specific heat, or conductivity, wither of which will reduce it's effectiveness somewhat. Remember to stick with a dark color.<br>
<br>
Thank You Kindly,<br>
<br>
Corwyn<br>
<br>
<o:p></o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>Topher Belknap<o:p></o:p></pre>
<pre>Green Fret Consulting<o:p></o:p></pre>
<pre>Kermit didn't know the half of it...<o:p></o:p></pre>
<pre><a href="http://www.GreenFret.com/">http://www.GreenFret.com/</a><o:p></o:p></pre>
<pre><a href="mailto:topher@greenfret.com">topher@greenfret.com</a><o:p></o:p></pre>
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