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Spliced Wood Stair Stringer at Landing

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jandlo

jandlo

Structural
Feb 28, 2006
33
I don't have much familiarity with wood stair design. The little wood design I've done, the stairs have typically been a delegated design. In the case I'm looking at now, I don't have support at the top of the stair run. So the stringer will need to span across the landing, to the wall (see image below). I do this with steel all the time, but am less familiar and comfortable with wood. I intend to sister the notched stringer with a full depth 2x12 in order to get the 12' span to work. I'm sure there are ways to splice the stringer to transfer moment where the stringer meets the landing, but I'm not sure if that is the best way to do this, or what that detail looks like. Anyone have any insight?

stringer_fjcnsl.png
 
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Moment splices in wood are generally avoided. The amount of attention to detail required on site, and the general slip in wood connections, make it non viable.

Normally, the front edge of the wood landing is the support for the stairs. Can you post a plan view? Why can't the landing be self supporting and provide a support for the stair.
 
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I agree with jayrod on the infeasibility of a wood to wood moment connection for something like this. One option shown below.

C01_hfqf9g.jpg
 
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Or an alternate structural model if such a thing could be justified.

C01_rkludp.jpg
 
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I think Koot's second sketch is what truly happens in real life for the couple of scenarios that stairs in these configurations exist. But I'd rather not rely on something like that when it comes to wood framing. There's usually other, more confident, ways to skin this cat.
 
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A cut and re-welded flitch beam is the way I have tackled these (dogleg flitch). Does not have to extend the entire length of the stringer. 10 ft. will usually work.
 
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Crap, did not see Koots channel idea. Yes, that will work.
 
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Thanks for the suggestions! A plan sketch is below. It's a little more complex than the initial image i used. I can't cantilever the landing off the floor framing because the beams and joists are at the same elevation. It's only the outside stringer that has this condition. I'm thinking a flitch plate is a reasonable option. That will complicate the treads where the steel plate is. I'm not sure the best way to do that yet.


Capture_vjmxjn.png
 
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Why take the troubles to save two posts?
 
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Sorry. I forgot to mention that there is an existing stair below, running perpendicular which precludes the addition of a post.
 
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Got you. If the landings aligns with each other, I've seen posts been extended all the way up. It was steel stairs in industrial setting though.
 
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