Winder Staircase Design

JamesTmer · Apr 23, 2020

I have this following staircase. step '1' connects to concrete slab and step '12' sits on wall below. step 15/16 connects to the slab above. Now I am wondering if I need additional support at say step 4/5? What's your thoughts? If not, How do I analyse this? I am also wondering what it looks like at winder landing? I googled but had no luck. Can you share some details of this kind of staircase? Thanks.

JamesTmer · Apr 23, 2020

Sorry forgot the add the picture. If additional supports are required, where would you put?

SteelPE · Apr 23, 2020

What type of material are you using for the stair? Wood, Steel, Concrete?

kipfoot · Apr 23, 2020

Yes, tread 4 needs to be supported. I also suggest that you look at your local code for stair provisions. Under IRC, the inside edge of the tread must be 6", iirc.

JLNJ · Apr 23, 2020

kipfoot is right. It's dangerous to have treads come to a point.

r13 · Apr 23, 2020

What type of wall along steps 4 to 11, can't you utilize it?

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Winder Staircase Design

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