Hi, just drop into earlier discussion (again) noting Arch Structure already has a Precast Stair which calculate based on input tread and riser! No need to attempt any code myself 
(Thank Joancabeza who bring this up again)
The Precast Stair code is more straightforward for me to understand, though it apparently lacks some features like stringer, nosing (which I do not need at the moment).
Now if I manage to, and with some time, I would attempt a vertical stairwell with intermediate landing (rather than a straight flight with a landing that can be done now in Arch Stair).
Any thought how you would like / have planned to do / develop further with these 2 approach of Stairs (Arch Structure Precast Stair / Arch Stair)?
