[RE-wrenches] METAL ROOF ATTACHMENT

[Mark Frye]

Generally, in order to develope the full tensil strength of the bolt, it
should be engaged by a minimum of 5 threads.
 
Mark Frye 
Berkeley Solar Electric Systems 
303 Redbud Way 
Nevada City,  CA 95959 
(530) 401-8024 
 <http://www.berkeleysolar.com/> www.berkeleysolar.com  
 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of North Texas
Renewable Energy Inc
Sent: Thursday, April 21, 2011 2:28 PM
To: RE Wrenches
Subject: [RE-wrenches] METAL ROOF ATTACHMENT


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
 <mailto:ntrei at 1scom.net> ntrei at 1scom.net 
817.917.0527
 <http://www.ntrei.com/> www.ntrei.com
 
 
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