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As an update- the system used at this install turned out to be a
currently-available product called SolAttach:<br>
<a class="moz-txt-link-freetext" href="http://www.solattach.com/">http://www.solattach.com/</a><br>
<br>
<br>
<div class="moz-cite-prefix">On 2014/6/3, 11:11, Dave Click wrote:<br>
</div>
<blockquote cite="mid:538DE5A3.30508@fsec.ucf.edu" type="cite">
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Jason, thanks for the comment! I agree that systems could connect
to just sheathing and stay on the roof- I think Zilla has a
product that does this too. My concern about wind resistance stems
from the fact that there appeared to be an engineer's stamp on the
Unirac calcs with lag screws and then something completely
different was installed in the field. It's likely that this
installer has used this same mounting system in windier coastal
areas so hopefully their fastener selection had some informed
analysis... I didn't see any, though.<br>
<br>
And to be clear, I'm not looking to overrule another PE if it is
in fact an engineered system and it's just that the wrong set of
plans got submitted to the building department.<br>
<br>
DKC<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 2014/6/3, 10:12, Jason Szumlanski
wrote:<br>
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<blockquote
cite="mid:CAJJtG3rpuVxygg1_VQycvp=BZD4jcmRyn9U0HHuoXZ15eq+1iw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:verdana,sans-serif">Dave,</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif"><br>
</div>
<div class="gmail_default"
style="font-family:verdana,sans-serif"> I can't identify
your hardware, but I just wanted to comment on your comment
about hitting rafters. There are products out there that can
obtain the requisite load ratings without connecting
directly to structural members. We have had systems
engineered and permitted using Ecofasten products on
low-slope roofs that fasten only to wood sheathing or metal
roof materials in 170 mph zones in Florida (ASCE 7-10, FBC
2010). I'm not an engineer, but I've been told if there is
adequate data on pull-out and shear, you can use that data
to properly design a system without hitting rafters with the
right number of attachment points. I don't like the looks of
what you pictured, but it's plausible that it was an
engineered system design. The permit drawings not
matching... that is another story...</div>
<div><br>
</div>
<div>
<div class="gmail_default"
style="font-family:verdana,sans-serif">If, for example,
each of the six fasteners provide 100 pounds of pullout
strength with a safety factor, that would be good for 12
sq ft at 50 spf uplift per attachment. 250 fasteners would
be good for about 5kW of solar.</div>
</div>
<br>
<div id="WISESTAMP_SIG_gmail_session"
href="http://WISESTAMP_SIG_gmail_session">
<div
style="font-size:13px;font-family:Verdana,Arial,Helvetica,sans-serif">
<div style="margin:0 0 8px 0">
<p style="margin:0"><span><span>Jason Szumlanski</span></span></p>
<div class="gmail_default"
style="font-family:verdana,sans-serif;display:inline">
Fafco Solar</div>
<br>
</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jun 3, 2014 at 9:06 AM,
Dave Click <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:daveclick@fsec.ucf.edu" target="_blank">daveclick@fsec.ucf.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi
all,<br>
<br>
Anyone know what this racking system is? The permit
drawings say Unirac with lag screws and Eco-Fasten
flashings, which this pretty clearly isn't. I'd never
seen this before, and I imagine this wind resistance is
not quite the 140 mph that the installer claims it is.
Of the ~250 wood screws holding this system down into
the roof, I think six of them accidentally hit rafters.<br>
<br>
Thanks!<span class="HOEnZb"><font color="#888888"><br>
Dave<br>
</font></span></blockquote>
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