Wood Stairs At Exterior Wall

[NewbieStruct]

I am helping in the design of a three story wood building. We have a wood stair at the exterior wall at one end. I am trying to understand the detailing aspect of the stairs in terms of the top plate height. Generally, we show a top plate height at the mid landing and then the top plate height of the floor. What about the top plate height at wood stringer?
Is the top plate generally inclined at these locations so the stringer beam can brace the studs and the out of plane loads can be transferred into stair treads? Or do I design the stringer for these out of plane loads ? Or is there a different standard that is adopted?

 

[mike20793]

I don't change any of my plate heights for wood stairs since most of my wood construction is panelized. Typically there is a primary landing in the shaft that we frame out with LVL's and joists; same for the intermediate landing. At the intermediate landing we will use 3 ply LVL's at the exterior wall to pick up the other end of the joists and resist wind loads from the studs. The LVL's at the edge of the landing take the thrust from the stringers. It always gets weird when you consider the fireproofing of the stairs and how the shaft walls can support the LVL. Simpson has some hangers that work, but I don't believe there is an ICC Report for them. Note that I have only done this when the "short" shaft wall is the exterior wall.

 

[medeek]

A diagram/drawing would be helpful in visualizing the general design.

A confused student is a good student.
Nathaniel P. Wilkerson, PE

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