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Re: Stair Ledger

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I'm not an architect, but last time I was wandering around in UBC Chapter 3 or 5 looking at stair construction requirements I recall that YOU  CAN  NOT  HAVE COMBUSTIBLE  STAIR  CONSTRUCTION  in this type of occupancy.   Check with your  very diligent inspector.
Lags into the studs COULD work for wood or steel ledger.  You would need to design the lags as cantilevering the thickness of the gypsum plus 1/2 the ledger thickness, plus do other unpleasant checks for Mode III or whatever failure in main member.  I recall that even approaching UBC side member  perp. to grain table values, the lags are overstressed in bending at a cantilever length of LESS than their diameter....
Good luck,

>For a 4-story, wood-framed, senior housing facility, the building official
>requires that the stairways be sheathed with gypboard on the outside, one
>layer of 5/8", and the gypboard cannot be interrupted by ledgers.  Neither
>will he allow the floor joists to bear on the stairway walls.