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</o:shapelayout></xml><![endif]--></head><body 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'>This would probably be with some insulation incorporated into the assembly. I think all mass oriented (rammed earth, etc.) bit the bullet on that one. A building with significant interior mass and insulated will perform better and be more comfortable in a ventilated building than a comparably insulated light mass building. The question is always at what cost. Mass is weight and weight requires supportive structure. Easy to achieve in a ground supported floor, more difficult with walls. There probably is a point where the increase in mass and associated cost would be of greater benefit than increased insulation due to the limitations of hrv. It <u>may</u> be that an extra 1/2” of gypsum interior is comparable and of more benefit than an extra ½” of outboard insulation. I don’t know.<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><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Good for fires and noisy neighborhoods as well.<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 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"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Greenbuilding [mailto:greenbuilding-bounces@lists.bioenergylists.org] <b>On Behalf Of </b>Alan Abrams<br><b>Sent:</b> November-29-12 8:01 AM<br><b>To:</b> listserv Green Building new<br><b>Subject:</b> [Greenbuilding] dynamic benefit of massive systems<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>I came across a claim that a 12" thick AAC block wall achieves R-22 (more than double the rated per unit R-value of the material itself) in the Washington, DC climate, apparently based on DBMS--the Dynamic Benefit of Massive Systems. Having cut my builder's eyeteeth laying adobe bricks in northern New Mexico, I am familiar with the concept of the flywheel effect. I am also vaguely acquainted with some study done at the Oak Ridge lab on this notion.<br><br>still, I am skeptical of the claim mentioned above, and would not want to count on it for the not unusual three weeks of late January when the daytime temp never gets out of the 20's <br><br>...am I alone?<br><br>see:<br><br><u><a href="http://xa.yimg.com/kq/groups/16482788/358061318/name/AACthermal.pdf">http://xa.yimg.com/kq/groups/16482788/358061318/name/AACthermal.pdf</a></u><br><br>AA<br><br clear=all><span style='color:#660000'>Alan Abrams<b><br></b></span><i><span style='color:#666666'>certifed professional building designer, AIBD<br>certified passive house consultant, PHIUS</span></i><b><span style='color:#660000'><br>Abrams Design Build LLC</span></b><span style='font-size:13.5pt;color:#660000'><br><i>sustainable design for intentional living</i></span><span style='color:#660000'><br></span><span style='font-size:7.5pt;color:#666666'>6411 Orchard Avenue Suite 102<br>Takoma Park, MD 20912<br>office 301-270-NET- ZERO <a href="tel:%28301-270-6380" target="_blank">(301-270-6380</a>) <br>fax <a href="tel:301-270-1466" target="_blank">301-270-1466</a> <br>cell <a href="tel:202-437-8583" target="_blank">202-437-8583</a><br><a href="mailto:alan@abramsdesignbuild.com" target="_blank"><span style='color:#666666'>alan@abramsdesignbuild.com</span></a><br><a href="http://www.abramsdesignbuild.com/" target="_blank"><span style='color:#666666'>www.abramsdesignbuild.com</span></a></span><o:p></o:p></p></div></body></html>