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Re: schoo l- roof snow 125 psf - top hung joist hangers over two layers existing gypsum wall board

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The engineer needs a good kick in the pants.  He SHOULD
know better.

Dan Goodrich, P.E.

> Scott,
> Top flange hangers are designed to be nailed to and bear on an appropriate
> solid wood material.  If the 2 layers of drywall extend up to the top of
> connection and compromise the bearing of the top flange hanger, then the
> connection should be re-designed.
> A ledger might work to support the hangers, but the ledger's connectors to
> the existing structure will need to be designed to handle the offset
> shear/bending situation created by the thickness of the drywall. Solid
> spacers could be added (imbedded into the drywall) to prevent the ledger
> connector's rotation and simplify the design (only if it is not a
> The engineer needs to take another look at the connection.
> Pat Clark, P.E.
> -----Original Message-----
> From: Haan, Scott M. <HaanSM(--nospam--at)>
> To: Se-Practice List (E-mail) <se-practice(--nospam--at)>; Seaint list
> (E-mail) <seaint(--nospam--at)>; IBC list (E-mail) <IBC_IRC(--nospam--at)>;
> Aec-Residential List (E-mail) <aec-residential(--nospam--at)>; Jim Mattison
> (E-mail) <jmattison(--nospam--at)>
> Date: Friday, March 09, 2001 9:19 AM
> Subject: schoo l- roof snow 125 psf - top hung joist hangers over two
> existing gypsum wall board
> >I am a plan checker looking at plans for a school alteration.  The roof
> snow
> >load is 125 psf at the particular location. The plans have a detail where
> >new roof wood joists are being hung off an existing wall with Simpson top
> >hung joist hangers butted against 2 layers of existing gypsum wall board.
> >
> >The engineer says there is an existing similar condition at the school
> >is doing fine.  I told the architect just because it was done wrong
> >does not mean I am going to issue a permit for an incorrect new
> application.
> >The reason they are getting the permit is the roof collapsed in a
> >portion of the building.
> >
> >
> >Does Simpson have any guidelines on this type of application?   Has
> >had problems with this type of application?
> >
> >
> >Scott M Haan  P.E.
> >Plan Review Engineer
> >Building Safety Division,
> >Development Services Department,
> >Municipality of Anchorage
> >phone: 907-343-8183   fax: 907-249-7399
> >mailto:haansm(--nospam--at)
> >
> >
> >