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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The bonding of a tile or dissimilar material to a concrete slab usually requires a separation or slip sheet of some sort as well as a trowel pattern that will create air pockets. This is different that simply a concrete resurfacing material. Resurfacing is typically a very finely graded cement product with modifiers to allow for bonding and movement. The density of these materials would be typically high possibly exceeding the concrete slab. I can’t see an issue that would involve removing a slab unless it is totally f_____ for other reasons.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Greenbuilding [mailto:greenbuilding-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Vadurro, Rob, EMNRD<br><b>Sent:</b> May-13-13 8:07 AM<br><b>To:</b> topher@greenfret.com; Green Building<br><b>Subject:</b> Re: [Greenbuilding] Passive solar home--concrete overlay re thermal mass<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US 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><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span lang=EN-US 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 lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Park Architect<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US 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 lang=EN-US 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 lang=EN-US 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 lang=EN-US 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 lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>505-476-3361 fax</span><span lang=EN-US style='font-family:"Baskerville Old Face","serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Greenbuilding [<a href="mailto:greenbuilding-bounces@lists.bioenergylists.org">mailto:greenbuilding-bounces@lists.bioenergylists.org</a>] <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></div></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div><p class=MsoNormal><span lang=EN-US>On 5/13/2013 1:07 AM, KTOT (g) wrote:<o:p></o:p></span></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span lang=EN-US>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></span></p></blockquote><p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><br>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<o:p></o:p></span></p><pre><span lang=EN-US>-- <o:p></o:p></span></pre><pre><span lang=EN-US>Topher Belknap<o:p></o:p></span></pre><pre><span lang=EN-US>Green Fret Consulting<o:p></o:p></span></pre><pre><span lang=EN-US>Kermit didn't know the half of it...<o:p></o:p></span></pre><pre><span lang=EN-US><a href="http://www.GreenFret.com/">http://www.GreenFret.com/</a><o:p></o:p></span></pre><pre><span lang=EN-US><a href="mailto:topher@greenfret.com">topher@greenfret.com</a><o:p></o:p></span></pre></div></body></html>