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RE: Roof deck reinforcing

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United Steel Deck has a series of articles that covers these types of questions.  You may check their web site or the inside front cover of some previous Modern Steel Construction mags.
Brian K. Smith, P.E.
-----Original Message-----
From: John Riley [mailto:jpriley485(--nospam--at)]
Sent: Wednesday, May 10, 2000 1:04 PM
To: Frank E. Stewart; Les Kuehl; seaint(--nospam--at)
Subject: Roof deck reinforcing

When using 1 1/2" metal roof deck (1.5B22) spanning no more than 5'-0", we include a detail that specifies reinforcing for the deck at roof openings up to 8'-0" x 5'-0".
At what point do you say that the opening is small enough that reinforcing is not required?  Specifically, I would say that a 4" plumbing vent is OK without reinforcing, but a 24" x 30" roof hatch is not.  Somewhere in between is a cut-off size.  Is there a common practice?
John P. Riley SE
Riley Engineering
Blue Grass, Iowa