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Re: Ceiling Joists to Wall Stud Connections through Drywall

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Tom,

Please fax to 626-568-9327.  Everyone else please accept my apologies for
doing this on-list, I tried to reply to the return email address on Tom's
message (off-list), but the message was rejected by Juno's servers.

Drew

----- Original Message -----
From: "Tom J Bogler" <tbogler1(--nospam--at)juno.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, February 20, 2001 11:07 PM
Subject: Re: Ceiling Joists to Wall Stud Connections through Drywall


> 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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