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RE: Welding Through Metal Roof Deck

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There are a lot of complexities to your proposal.   You may want to try a deeper deck, heavier gauge deck, or mechanical fasteners. 

Regards, Harold Sprague

> Subject: Welding Through Metal Roof Deck
> Date: Mon, 2 Mar 2009 13:04:30 -0600
> From: jadair(--nospam--at)
> To: seaint(--nospam--at)
> To all the Welding Experts on the List:
> I have a project that has a lot of exposed steel structure. We're using
> a decorative steel roof deck that is going to be exposed in many
> locations on the interior, but also on the exterior after it crosses the
> perimeter beam and becomes the soffit of the roof overhang. The
> architect wants to have deck overhangs longer than what the deck can
> cantilever, but doesn't want to see outriggers, so I've proposed putting
> 2"-deep outriggers above the deck, where they'll be buried between the
> deck and rigid insulation. However, this means that the outriggers
> would have to be welded to the perimeter beam and the first interior
> joist by intentionally burning through the 20-gauge deck as the fillet
> weld between the outrigger and the roof beam/joist is made.
> Should I be concerned about making this weld? Should I come up with an
> alternate connection detail?
> Thanks for your insights.
> -- Joel
> Joel Adair PE
> Structural Engineer
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