<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>Steve,</div><div>I am suggesting a sip type assembly only without the bottom plywood. The insulation will rest on the 1x2 nailers. This is the inverse of what you discribed.</div><div><br></div><div><br></div>Sent from my cell phone<div></div><br><br>-------- Original message --------<br>From: Steve Houlihan <sho11@comcast.net> <br>Date:12/07/2014 1:28 PM (GMT-05:00) <br>To: greenbuilding@lists.bioenergylists.org <br>Cc: <br>Subject: Re: [Greenbuilding] Polyiso strength on roof <br><br>
There are many thousands of roofs out there with a layer of plywood
then rigid foam above. I'm under one right now. I have never seen
the Building Department to have a problem with this. I suggest you
check with your local jurisdiction to be sure.<br>
I don't see any difference to this from using SIPS on the roof.<br>
<br>
Steve Houlihan<br>
<br>
<div class="moz-cite-prefix">On 12/7/14 10:08 AM, John Salmen wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Ply
sheating wouldn’t qualify as a barrier. Glas mat roofing
board would.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" lang="EN-US">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" lang="EN-US"> Greenbuilding
[<a class="moz-txt-link-freetext" href="mailto:greenbuilding-bounces@lists.bioenergylists.org">mailto:greenbuilding-bounces@lists.bioenergylists.org</a>] <b>On
Behalf Of </b>Alan Abrams<br>
<b>Sent:</b> December-07-14 9:55 AM<br>
<b>To:</b> Green Building<br>
<b>Subject:</b> Re: [Greenbuilding] Polyiso strength on
roof<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">'nuther factor is the prohibition against
exposed plastic foam in the attic. even foil faced polyiso
does not fulfill the requirement.<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">-aa<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><br clear="all">
<o:p></o:p></p>
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<div>
<div>
<p class="MsoNormal"><span style="color:#660000">Alan
Abrams<b><br>
</b></span><i><span style="color:#666666">certified
professional building designer, AIBD<br>
certified passive house consultant, PHIUS</span></i><o:p></o:p></p>
<div>
<p class="MsoNormal"><i><span style="color:#666666">certified
passive house builder, PHIUS<br>
</span></i><span style="font-size:7.5pt;color:#666666">cell
202-437-8583<br>
<a moz-do-not-send="true" href="mailto:alan@abramsdesignbuild.com" target="_blank"><span style="color:#666666">alan@abramsdesignbuild.com</span></a><br>
</span><a moz-do-not-send="true" href="http://www.heliconworks.com/index2.html" target="_blank">HELICON WORKS <i>Achitecture
and Education</i></a><o:p></o:p></p>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Sun, Dec 7, 2014 at 12:44 PM, Ron
Cascio <<a moz-do-not-send="true" href="mailto:roncascio@verizon.net" target="_blank">roncascio@verizon.net</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D" lang="EN-US">Sounds good to
me.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D" lang="EN-US"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D" lang="EN-US">Ron</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D" lang="EN-US"> </span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" lang="EN-US">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"" lang="EN-US"> Greenbuilding [mailto:<a moz-do-not-send="true" href="mailto:greenbuilding-bounces@lists.bioenergylists.org" target="_blank">greenbuilding-bounces@lists.bioenergylists.org</a>]
<b>On Behalf Of </b>Bill Allen<br>
<b>Sent:</b> Sunday, December 07, 2014 10:52
AM<br>
<b>To:</b> Green Building<br>
<b>Subject:</b> [Greenbuilding] Polyiso
strength on roof</span><span lang="EN-US"><o:p></o:p></span></p>
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Hi all<o:p></o:p></span></p>
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I am about to reroof my 1926
colonial and am looking to also insulate per
the BSC "deep energy retrofit" plans
consisting of plywood sheathing, 2 layers of
2" polyiso, another layer of plywood, then
roofing (in my case, standing seam metal
roofing).<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">The original roof was wooden
shingles that are still in place with 2
layers of asphalt on top. Also still in
place are the nailers for the wood
shingles...roughly 1x2s, 5.5" on center
across the rafters.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">My question is: if I leave the
1x2 nailers in place during the demo can i
exclude the first layer of plywood and
install the polyiso directly on the nailers?
It would then have plywood on top, secured
with long screws into the rafters. Less
material and less cost.<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Thanks for any
thoughts/comments.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Sent from my cell phone<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">< dy><o:p></o:p></span></p>
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