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Re: Ceiling Joists to Wall Stud Connections through Drywall

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The December 2000 issue  of Structural Engineer has an article on
this type of connection, "The Type V hybrid".  I can fax it to you if you

don't have it.
Tom Bogler

On Tue, 20 Feb 2001 15:55:48 -0800 "Drew A. Norman, SE"
<DNorman(--nospam--at)dnormanse.com> writes:
> Colleagues:
> 
> An architect recently sent me two details showing light gage metal 
> ceiling
> joists framing respectively to an existing wood stud wall and a new 
> light
> gage metal stud wall.  This is rated construction, with drywall both 
> sides
> of the ceiling joists and studs, and the framing is balloon (not
> platform) -- with the studs being continuous to the underside of a 
> roof
> structure above.  Both details show a continuous track surface 
> mounted on
> the face of the drywall and attached to the studs behind it with 
> undefined
> fasteners pentrating through the wall board and into the studs.  The 
> client
> wanted me to help them specify appropriate fasteners to make these
> connections.
> 
> I selected appropriate numbers and sizes of wood screws and sheet 
> metal
> screws respectively, basing allowable loads on single shear 
> connections, and
> gave these to the client, modifying his details to show that the 
> continuous
> tracks needed to be mounted directly against the studs (e.g., that 
> the
> drywall had to stop above and below the ceiling joists).  He has 
> responded
> by saying that he needs to have the gyp board continuous across the 
> face of
> the wall (i.e., between the track and the studs) for fire safety and
> security reasons, that these kinds of "through drywall" connections 
> are made
> all the time, and that I must be missing something if I couldn't 
> calc it out
> (I told him that I did not know of an approval that would allow me 
> to rely
> on the strength of the wall board and that I did not think it was 
> practical
> to design the screws to "cantilever" across the gap that the wall 
> board
> represents).
> 
> I recently had to help "fix" a similar (but, to be fair, more highly 
> loaded)
> connection (which I had declined to approve) for another client 
> after it
> failed by tearing of the drywall around the fasteners (a portion of 
> the
> drywall was removed and a ledger "ribbon" direct mounted on the 
> faces of the
> studs added as a repair), so I am very reluctant to advise this 
> customer to
> do anything except cut out the gyp board.
> 
> Any suggestions?
> 
> Drew A. Norman, S.E.
> Drew A. Norman and Associates
> Pasadena, California

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