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<DIV><FONT size=2 face=Arial>Alan,</FONT></DIV>
<DIV><FONT size=2 face=Arial>That's not a bad idea. I think it's fair to
say that the insulation value is being reduced from R10 to what, an R6 - due to
the heat transfer of the metal bars. I think the key is whether we can
safely tape the joints to provide continuous insulation, while allowing drying
to the outside. What's your opinion on that?</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Thanks!<BR><BR>John</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><BR> </DIV>
<DIV>----- Original Message ----- </DIV>
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style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=alan@abramsdesignbuild.com
href="mailto:alan@abramsdesignbuild.com">Alan Abrams</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=John@fourpointscg.com
href="mailto:John@fourpointscg.com">J Messerschmidt</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=plea_4peace@yahoo.com
href="mailto:plea_4peace@yahoo.com">Thomas Lewis</A> ; <A
title=greenbuilding@lists.bioenergylists.org
href="mailto:greenbuilding@lists.bioenergylists.org">greenbuilding@lists.bioenergylists.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, November 11, 2010 11:23
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Greenbuilding] Insulation
Problems</DIV>
<DIV><BR></DIV>building on John S's comments...<BR><BR>...are there some semi
rigid strips of something like neoprene that could be applied over the outside
face of the z-bars, that would have sufficient resistance to compression to
support the cladding yet still provide some thermal breakage before the
cladding is attached? this assumes that the potential for heat loss
through the bridges is so great that even the addition of R-0.5 btwn bars and
cladding would be significant.<BR><BR><BR>AA<BR><BR><BR><BR clear=all><B
style="COLOR: rgb(0,102,0)">Alan Abrams</B><B
style="COLOR: rgb(0,102,0)"><BR>Abrams Design Build LLC</B><BR
style="COLOR: rgb(0,102,0)"><I style="COLOR: rgb(0,102,0)">A sustainable
approach to beautiful space</I><BR style="COLOR: rgb(0,102,0)"><FONT
style="COLOR: rgb(0,102,0)" size=1><A style="COLOR: rgb(51,51,255)"
href="mailto:alan@abramsdesignbuild.com"
target=_blank>alan@abramsdesignbuild.com</A><BR
style="COLOR: rgb(51,51,255)"><A style="COLOR: rgb(51,51,255)"
href="http://www.abramsdesignbuild.com"
target=_blank>www.abramsdesignbuild.com</A><BR><FONT size=2><B>202-726-5894
o<BR>202-437-8583 c<BR>202-291-0626 f</B></FONT></FONT><BR><BR><BR><BR><BR>
<DIV class=gmail_quote>On Thu, Nov 11, 2010 at 11:02 AM, J Messerschmidt <SPAN
dir=ltr><<A
href="mailto:John@fourpointscg.com">John@fourpointscg.com</A>></SPAN>
wrote:<BR>
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<DIV><FONT size=2 face=Arial>Hi Thomas,</FONT></DIV>
<DIV><FONT size=2 face=Arial>I love the suggestion of taping the seams and
taping the board to z bars. With the air leakage to the outside
eliminated that would bring us a lot closer to the r-10, and it would be a
proper drainage plane. My concerns are, what kind of tape and how does
water escape if it does get in? 2" of xps has permeance of .55.
Will that allow vapor to escape? What about bulk moisture?
Behind the xps is a liquid applied membrane that probably has a very low
permeance, so it has to dry to the outside. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Lastly, looking at the interior wall assembly,
if the open cell foam has a perm rating of 8, and 1" of polyiso has a
perm of 2.33, this could be a well insulated wall and will still dry to the
inside. Right? Unless I'm missing something, we'd end up
with about an R30 wall. I'd be very happy with that. What do you
think? </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial></FONT><FONT size=2
face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Thanks!</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>John</FONT></DIV>
<DIV><FONT size=2
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