emt ran in 'ribs'

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jes25

Senior Member
Location
Midwest
Occupation
Electrician
It has been common practice, around here at least, to run emt in the 'ribs' of the decking in commercial buildings. By 'ribs' I mean above the very top edge of a metal roof truss in the roof decking. AN inspector has told us that is no longer allowed due to concern self-tapping screws will pierce the pipe when the roof is repaired down the road. I do believe this is a valid concern, but I don't see anything new in the code relating to this issue (we recently have adopted the '08 version). I think 358.12 (1) could apply.

Has anyone else heard of this? I'm wondering if it's new interpretation from the top or just an isolated inspector. Or maybe some code I don't know. I'm in Michigan BTW.
 
that was done in the last code cycle....as roofers like to use 3in screws that were penetrating conduits as i remember.
 
lakee911 said:
I think that this would be good to do underneith all roofs. Even wood roofs have the potential for fasteners to come through the sheathing.
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Agreed. I have seen many wood framed roof construction that utilizes rubber roofing and the same concern would be there as is found for the metal roof deck. Sounds like a proposal for the 2014 NEC....

Pete
 
480sparky said:
Check out 300.4(E).

Or, you could have just asked the inspector..... make him earn his pay for a change.
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300.4(E) is it. Thanks.

I would have asked him, but I wasn't on the job. Others have asked me because I tend to keep up on the code a little more than some of my coworkers
 
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