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This is for a shed. I'm having problems finding enough support for either stringer and I can't find any close-up images of how this might be done. My only choice seems to be to pull the lower staircase back from the upper. Is there a way to make this work within this tighter space?

stairs

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  • You can also extend the platform towards the upper flight (the upper stringer lands on the platform, not under it) and support by post (the general idea of which is similar to the existing answer.)
    – Ecnerwal
    Commented Mar 7, 2018 at 3:33

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Dog-Leg stairs

Structurally, the flights of a dog-leg stair are usually supported by the half-landing, which spans the adjoining flank walls.

Staircase plan
Image: Bill Bradley. CC by SA 3.0

In this arrangement, the stringers are joined to a newel post. The lower landing is also partly supported by the newel post. The upper by only the flanking walls and, I guess, effectively braced by lower stringers.

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    I have built this type of lower landing with four posts under the landing when it was an outdoor stairs and there were no adjoining walls. Same could be done here if the walls are very difficult to mount to. One example would be an older basement with rock walls.
    – Michael Karas ♦
    Commented Mar 6, 2018 at 13:47

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