Metal roofs

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jim s.

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Recently a new type of roof is being installed in our town . It's a slate look alike very nice looking and very expensive. The installation company was asked about bonding and they in turn asked the manufacturer who said it wasn't necessary.The material in question, if you haven't already quessed , is aluminum.Any thoughts on bonding. Thanks



Jim S.
 
So if there is no particular section on bonding metal roofs, can we go to the section that says any metal likely to become energized shall be bonded.

jim s.
 
If the roofing isn't interconnected, then bonding want help entirely, yet if it's interconnected, and is likely to become energized, then I would run a bond from the service (other options of bonding are available), based on T. 250.66. Yet, I'm open to hear others on this one.
 
77401 said:
Where the metal interconnects to the adjoining shingles I'd install a green ground screw with a # 14 onto each shingle & take each EGC back to the panel.
Or, just solder a RG 6 quad to it & use the roof for High def satelite reception.
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Now who's being a wise guy?! :-D
 
jim s. said:
So if there is no particular section on bonding metal roofs, can we go to the section that says any metal likely to become energized shall be bonded.

jim s.
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...and just how is it likely to become energized?

See 250.116 FPN
 
Metal Roof Are Not a New Invention!

Metal Roof Are Not a New Invention!

This is not new. Metal roofs have been around for at least 80 years and the NEC has not yet found it necessary to explicitly require bonding.

This looks like the kind of thing that some inspector with an ********************** problem might use on a builder he didn't like.

Edited by Ryan_618 to remove particular reference to the human anatomy. Please try to keep it clean. :(
 
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We had a customer with a metal roof, that had an attic fan, that protruded through the roof. Our inspector required us to bond the roof from the service panel. Nothings impossible!
 
As far as I can tell metal siding is not required to be bonded. One local jurisdiction decided to remedy this and added that siding must be bonded. They forgot to add the word "metal". Yes, an electrician received a violation because the VINYL siding was not bonded! He wondered if he should use a non-metallic bonding lug to make the connection!
Nothing is simple!
 
resistance said:
We had a customer with a metal roof, that had an attic fan, that protruded through the roof. Our inspector required us to bond the roof from the service panel. Nothings impossible!
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why would it need to be bonded to the service panel? isn't the fan housing itself already bonded?
 
I inspected an electrical accident last year where the aluminum siding was energized by the POCO 120/240 volt service. It burned the house down, and of course the utility said the house siding wasn't properly grounded. I don't think the last word has been spoken in this case yet, and I bet the utility ponys up and pays.

Jim T
 
jtester said:
I inspected an electrical accident last year where the aluminum siding was energized by the POCO 120/240 volt service. It burned the house down, and of course the utility said the house siding wasn't properly grounded. I don't think the last word has been spoken in this case yet, and I bet the utility ponys up and pays.

Jim T
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how would bonding help in such a case? There is no OCPD on the service side? I guess it could melt the service xfmr and shut off power that way.
 
During hurricane season, my guess is that a lot of overhead power lines end up where they don't belong and I could see a metal roof becoming energized that way.(provided the wind didn't blow it off first).
 
77401 said:
Where the metal interconnects to the adjoining shingles I'd install a green ground screw with a # 14 onto each shingle & take each EGC back to the panel.
Or, just solder a RG 6 quad to it & use the roof for High def satelite reception.
Click to expand...

Depending on the size of the roof, a vertical antenna in the middle of the roof might make an awesome amateur radio antenna. The roof would work as an elevated RF ground. And yep, it would need to be grounded! Stealth antenna here we come! :D
 
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