<div dir="ltr"><div><br class="">All - There have been many products over the years that were engineered to fasten to roof sheathing only (remember BP Integra and SunPower SmartMount?), and I can certainly buy that their engineered uplift ratings are legit in terms of the strength of the connection between the sheathing and the racking system, but my concern is about the strength of the connection between the sheathing and the roof framing system. Similar to using S-5!'s clips, I don't see how we can really trust those footings without knowing the details (e.g. fastener number and type) of the roof / rafter connection, and those details can be very tough to access for built structures.</div>
<div class="gmail_extra"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><br></div><div dir="ltr">I think this has been discussed on this list previously, but I would be very curious to hear if there have been any new developments in how designers approach this issue. </div>
<div dir="ltr"><br></div><div dir="ltr">Jason - How do you're engineers handle this challenge in those hurricane wind zones in Florida, where roofs can fly off even without having a bunch of sails mounted to them?</div>
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<br><br><div class="gmail_quote">On Tue, Jun 3, 2014 at 8:40 AM, Max Balchowsky <span dir="ltr"><<a href="mailto:max@seesolar.com" target="_blank">max@seesolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="color:#000;background-color:#fff;font-family:arial,helvetica,sans-serif;font-size:10pt"><div><span>That does look like the early Unirac system, (I don't think they rated it for 140 mph). It wasn't designed to "hit" rafters, that's why there six screws in each base plate….</span></div>
<div></div><div> </div><div><span style="font-family:tahoma,'new york',times,serif">Max Balchowsky</span><br style="font-family:tahoma,'new york',times,serif"><span style="font-family:tahoma,'new york',times,serif">Design Engineer</span><br style="font-family:tahoma,'new york',times,serif">
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<div style="font-family:'times new roman','new york',times,serif;font-size:12pt"> <div dir="ltr"> <hr size="1"> <font face="Arial"> <b><span style="font-weight:bold">From:</span></b> Dave Click <<a href="mailto:daveclick@fsec.ucf.edu" target="_blank">daveclick@fsec.ucf.edu</a>><br>
<b><span style="font-weight:bold">To:</span></b> RE-wrenches
<<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> <br> <b><span style="font-weight:bold">Sent:</span></b> Tuesday, June 3, 2014 6:06 AM<br> <b><span style="font-weight:bold">Subject:</span></b> [RE-wrenches] Racking System - Identification Help<br>
</font> </div> <div><div><div class="h5"><br>Hi all,<br><br>Anyone know what this racking system is? The permit drawings say Unirac <br>with lag screws and Eco-Fasten flashings, which this pretty clearly <br>isn't. I'd never seen this before, and I imagine this wind resistance is <br>
not quite the 140 mph that the installer claims it is. Of the ~250 wood <br>screws holding this system down into the roof, I think six of them <br>accidentally hit rafters.<br><br>Thanks!<br>Dave<br><br></div></div>_______________________________________________<br>
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