<div>Gary</div><div> </div><div>Has anyone checked with the SIP manufacturer, this is a laminated structure and will have more holding power than simple sheathing between rafters (which is still doable with larger mounting plates and multiply short screws). It could be that they have performed shear and pull out tests when mounting directly to the sheathing. SIP's are engineered and you should be able to find engineering data to justify a mounting system. The bolt through with steel plates on both sides sounds like overkill to me, even if the pull out was less than needed doubling up or tripling up screwed plates on the surface designed for holding into sheathing seems the better solution, a lot less labor in the long run.</div>
<div> </div><div>Bill<br><br></div><div class="gmail_quote">On Tue, Jul 26, 2011 at 11:48 AM, R Ray Walters <span dir="ltr"><<a href="mailto:ray@solarray.com">ray@solarray.com</a>></span> wrote:<br><blockquote style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="gmail_quote">
<div style="word-wrap: break-word;">One problem that came up on a project recently, is that your penetrations (as proposed in your solution below) will essentially ruin the thermal performance of the SIPs system.<div>The whole point of the SIPs system is that there are no thermal short circuits such as framing members that allow heat to be transmitted around all that insulation.</div>
<div>The project I was referring to was with NREL, and a smart engineer caught it, and forced the PV contractor to mount in a way without penetrations.</div><div>I also work with very savvy architects that are now specifying minimal penetrations through the thermal envelope.</div>
<div>I'd suggest a standing seam roof, with S5 clamps. Ask the roofer to use extra attachment screws, if you're worried.</div><div><br></div><div><br><div>
<span style="font: 12px/normal Helvetica; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; border-spacing: 0px 0px; font-size-adjust: none; font-stretch: normal;"><div>
R. Walters</div><div><a href="mailto:ray@solarray.com" target="_blank">ray@solarray.com</a></div><div>Solar Engineer</div><div><br></div><div><br></div><br></span>
</div>
<br><div><blockquote type="cite"><div bgcolor="#ffffff" text="#000000"><font color="#000000" size="+1"><br>
One solution could be a product that had a bolt-plate on the
bottom of the SIP, that penetrates the SIP with long 5/16"
threaded bolt(s), and then attaching to the PV mount at the top of
the SIP. The UniRac SolarMount steel flat-top mount has four 5/16"
bolt-holes and might be a good choice. This method should have no
problem achieving the required pull-out resistance.<br>
<br>
Any suggestions, installation experience, on how to put PV on a
SIP roof?<br>
</font><font color="#000000" size="+1"><br>
</font>
<div><font color="#000000">-- <br>
</font>
<div><p style="line-height: normal; margin-bottom: 0pt;" class="MsoNormal"><font color="#000000"><span style="font-size: 10pt;">Regards,<br>
<br>
<br>
Gary Willett, PE<br></span></font></p></div></div></div></blockquote></div><br></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Bill Hoffer PE<br><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><span style="color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; border-collapse: separate; font-size-adjust: none; font-stretch: normal;"><font face="Garamond">NABCEP Certified Solar PV Installer™</font></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br>
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