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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The thermal bridging is pretty significant
– group in <st1:City w:st="on"><st1:place w:st="on">Vancouver</st1:place></st1:City>
did some modelling and based on 3” of extruded with horizontal z strips
at 24” spacing reduces the insulation effectiveness to 66% of its total <u>with
a wood cla</u>dding due to the bridging. So your r10 does become an r6.6 if
isolated from the metal copper cladding (which would reduce the insul value
more). <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Vertical wood battens or ½” foam
strips would have the benefit of providing a drain space behind the cladding as
well as a thermal break. I think I would also include a wrap over the foam
before adding strips (as you don’t know how good the liquid wrb is).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Alternatively you could add the proposed 1”
layer as an exterior wrap (wrb) instead of in the interior which would also
bring up the value of the 2” wrap – would still add a vertical
spacer.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoAutoSig><u><font size=3 color=green face="Gill Sans MT"><span
style='font-size:12.0pt;font-family:"Gill Sans MT";color:green'>JOHN SALMEN
ENVIRONMENTAL DESIGN<o:p></o:p></span></font></u></p>
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font-family:"Gill Sans MT";color:black;font-style:italic'>,. <st1:City w:st="on"><st1:place
w:st="on">DUNCAN</st1:place></st1:City>, B.C. <st1:country-region w:st="on"><st1:place
w:st="on">CANADA</st1:place></st1:country-region>, V9L 6M7<o:p></o:p></span></font></i></p>
<p class=MsoAutoSig><i><font size=2 color=black face="Gill Sans MT"><span
style='font-size:10.0pt;font-family:"Gill Sans MT";color:black;font-style:italic'>PH
250 748 7672 FAX 250 748 7612 CELL 250 246 8541<o:p></o:p></span></font></i></p>
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face="Gill Sans MT"><span style='font-size:10.0pt;font-family:"Gill Sans MT";
color:black;font-style:italic'>terrain@shaw.ca</span></font></i></st1:PersonName><i><font
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
greenbuilding-bounces@lists.bioenergylists.org
[mailto:greenbuilding-bounces@lists.bioenergylists.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Alan Abrams<br>
<b><span style='font-weight:bold'>Sent:</span></b> November 11, 2010 8:23 AM<br>
<b><span style='font-weight:bold'>To:</span></b> J Messerschmidt<br>
<b><span style='font-weight:bold'>Cc:</span></b>
greenbuilding@lists.bioenergylists.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Greenbuilding] Insulation
Problems</span></font><span lang=EN-US><o:p></o:p></span></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>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><font color="#006600"><span style='color:#006600;font-weight:bold'>Alan
Abrams<br>
Abrams Design Build LLC</span></font></b><font color="#006600"><span
style='color:#006600'><br>
<i><span style='font-style:italic'>A sustainable approach to beautiful space</span></i><br>
</span></font></span></font><font size=1 color="#006600"><span
style='font-size:7.5pt;color:#006600'><a
href="mailto:alan@abramsdesignbuild.com" target="_blank"><font color="#3333ff"><span
style='color:#3333FF'>alan@abramsdesignbuild.com</span></font></a></span></font><font
size=1 color="#3333ff"><span style='font-size:7.5pt;color:#3333FF'><br>
</span></font><font size=1 color="#006600"><span style='font-size:7.5pt;
color:#006600'><a href="http://www.abramsdesignbuild.com" target="_blank"><font
color="#3333ff"><span style='color:#3333FF'>www.abramsdesignbuild.com</span></font></a><br>
</span></font><b><font size=2 color="#006600"><span style='font-size:10.0pt;
color:#006600;font-weight:bold'>202-726-5894 o<br>
202-437-8583 c<br>
202-291-0626 f</span></font></b><br>
<br>
<br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Thu, Nov 11, 2010 at 11:02 AM, J Messerschmidt <<a
href="mailto:John@fourpointscg.com">John@fourpointscg.com</a>> wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi Thomas,</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family: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. </span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family: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? </span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks!</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>John</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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