I'm designing a stairs in a very tight space that has an upper landing and a lower landing, each segment requires a 90 deg turn. If the landing riser heights are different from the main run - does this present a hazard? If so - why?
Presently the upper landing is 10.5" drop, followed by steps of ~9.5", and back to 10.5" on the lower. The stair runs are 11.5"