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Lars,<br>
This has been addressed before on this list, but its been awhile.
#14 self-tapping ("Tek") screws have phenomenal pull-out strength in
standard steel purlins. My advice is to research this through your
fastener supplier; I have seen charts on pull-out strength of
various sizes and materials. I think you'll find that you can come
up with a screw attachment schedule with which you'll be satisfied.<br>
Allan<br>
<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
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On 3/15/2012 10:26 AM, lars Ortegren wrote:
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<p class="MsoNormal">Wrenches,<o:p></o:p></p>
<p class="MsoNormal">We have a project coming up where we are
installing a large array on a low slope metal building with
metal purlins. Typically we would through bolt our attachment
to the purlins, but in this case the building is a
self-storage, and access is not an option. Does anyone out
there have experience with any top side only metal-metal
attachments? I’ve thought about using some larger sized
stainless self-tapping screws, but I worry about the pull out
strength (as the roof combined with the c-channel purlins are
only about 1/8”) and the effects of heat and cooling of the
roof backing the screws out over time. Any thoughts ?<o:p></o:p></p>
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<p class="MsoNormal"><b><i>Lars Ortegren<o:p></o:p></i></b></p>
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