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Cob: Fw: rvalue,stabilizationjohn freeman erthdesign at hotmail.comMon Mar 19 01:33:58 CST 2001
From: john freeman To: coblist Sent: Wednesday, March 14, 2001 9:05 PM Subject: rvalue,stabilization hey there. Bill was wondering about using gypsum board to stabilize his cob wall mixes. (snip) "Has anyone added recycled gypsum board (Pulverized) to their cob mix to stabilize it? My biggest concern is the low r-value of cob. Our (loadbearing) walls will be starting at 36 inches thick at the base, tapering to about 26 inches at the rafters."(snip) WHY Bill? Is if for the building department? You don't need it man. It may just make matters more complex. It won't add significanly to your R value. Speaking of which, check out discussions in the archives about cob R values versus thermal storage capacity. Performance depends greatly on builing shape, size, location, wall thickness and orientation/exposure. There is no tight formula. The archives will prove fruitful I'm sure. Think about adding lots of good short straw too. Try a sample with as much staw as the cob can hold. Evidence I've seen would indicate that it is not only more insulative but also reaches a maximun strength. Worth a test block no doubt. Cobb in you cold climate may take a few test blocks to get the right mix. Good Luck ERTH design consultants 250. 882. 4404 Natural builder's Colloquium Spring 2001 check http://www. island.net/~elkec/calendar.htm#colloquium -------------- next part -------------- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> <META content="MSHTML 5.00.2614.3500" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV style="FONT: 10pt arial"> <DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A href="mailto:erthdesign at hotmail.com" title=erthdesign at hotmail.com>john freeman</A> </DIV> <DIV><B>To:</B> <A href="mailto:majordomo at deatech.com" title=majordomo at deatech.com>coblist</A> </DIV> <DIV><B>Sent:</B> Wednesday, March 14, 2001 9:05 PM</DIV> <DIV><B>Subject:</B> rvalue,stabilization</DIV></DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>hey there. Bill was wondering about using gypsum board to stabilize his cob wall mixes. </FONT></DIV> <DIV><FONT face=Arial size=2>(snip) "Has anyone added recycled gypsum board (Pulverized) to<BR>their cob mix to stabilize it? My biggest concern is the low r-value of cob. Our (loadbearing) walls will be starting at 36 inches thick at<BR>the base, tapering to about 26 inches at the rafters."(snip)<BR><BR>WHY Bill? Is if for the building department? You don't need it man. It may just make matters more complex. It won't add significanly to your R value.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Speaking of which, check out discussions in the archives about cob R values versus thermal storage capacity. Performance depends greatly on builing shape, size, location, wall thickness and orientation/exposure. There is no tight formula.</FONT></DIV> <DIV><FONT face=Arial size=2>The archives will prove fruitful I'm sure. Think about adding lots of good short straw too. Try a sample with as much staw as the cob can hold. Evidence I've seen would indicate that it is not only more insulative but also reaches a maximun strength. Worth a test block no doubt. Cobb in you cold climate may take a few test blocks to get the right mix. Good Luck</FONT></DIV> <DIV><FONT face=Arial size=2>ERTH <BR>design consultants<BR>250. 882. 4404</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Natural builder's Colloquium Spring 2001<BR>check <A href="http://www">http://www</A>. island.net/~elkec/calendar.htm#colloquium </FONT></DIV></BODY></HTML>
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