Cob: Fw: rvalue,stabilization

Sun Mar 18 23:33:58 PST 2001

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From: john freeman=20
To: coblist=20
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.=20
(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.
=20
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=20
design consultants
250. 882. 4404

Natural builder's Colloquium Spring 2001
check http://www. island.net/~elkec/calendar.htm#colloquium=20

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<DIV style=3D"BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A=20
href=3D"mailto:erthdesign at hotmail.com" =
title=3Derthdesign at hotmail.com>john=20
freeman</A> </DIV>
<DIV><B>To:</B> <A href=3D"mailto:majordomo at deatech.com"=20
title=3Dmajordomo 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=3DArial size=3D2>hey there. Bill was wondering about =
using gypsum=20
board to stabilize his cob wall mixes.&nbsp;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>(snip) "Has anyone added recycled =
gypsum board=20
(Pulverized) to<BR>their cob mix to stabilize it?&nbsp;&nbsp; My biggest =
concern=20
is the low r-value of cob.&nbsp; Our (loadbearing) walls will be =
starting at 36=20
inches thick at<BR>the base, tapering to about 26 inches at the=20
rafters."(snip)<BR><BR>WHY Bill?&nbsp; Is if for the building=20
department?&nbsp;&nbsp;&nbsp;You don't need it man.&nbsp; It may just =
make=20
matters more complex. It won't add significanly to your R =
value.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Speaking of which, check out =
discussions in the=20
archives about cob R values versus thermal storage capacity.&nbsp; =
Performance=20
depends greatly on builing shape, size, location, wall thickness and=20
orientation/exposure.&nbsp; There is no tight formula.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The archives will prove fruitful I'm =
sure.&nbsp;=20
Think about adding lots of good short straw too.&nbsp; Try a sample with =
as much=20
staw as the cob can hold.&nbsp; Evidence I've seen would indicate that =
it is not=20
only more insulative but also reaches a maximun strength.&nbsp; Worth a =
test=20
block no doubt.&nbsp; Cobb in you cold climate may take a few test =
blocks to get=20
the right mix.&nbsp; Good Luck</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>ERTH <BR>design consultants<BR>250. =
882.=20
4404</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Natural builder's Colloquium Spring =
2001<BR>check=20
<A href=3D"http://www">http://www</A>. =
island.net/~elkec/calendar.htm#colloquium=20
</FONT></DIV></BODY></HTML>

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