Wrenches I'm proposing a PV array on a metal building with L feet attached directly thru the roof into the purlins. The plan is to use thread cutting SS bolts, a minimum of ¼-28 pitch. The metal is 14 ga and will engage over 2 full threads and because the array is only 2 landscape modules on NS rails there will be 2 bolts for every module. 36 total. Im using a mag base drill press so the144 holes will be straight & round. What surprises can I expect or is there an easier way to go about this. Your 2¢ is welcome.
Jim Duncan North Texas Renewable Energy 486 W.N. Woody Road Azle Texas 76020 NABCEP Certified Solar PV Installer No.031310-57 TECL 27398 nt...@1scom.net 817.917.0527 www.ntrei.com
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