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Best Answer: Average width of a staircase is 36 minimum. The tread (step) is no less then 10. The rise is from 7 to 8 depending on the total rise. Take the total rise and divide by 7 1/2, average step, and that gives you you # of steps. Then take total rise and divide by # of steps, this tells you the exact size of your step. Now take size of rise and X by # of steps.
ADAAG provisions for stairs include the requirement that all steps have uniform riser heights and uniform tread widths of not less than 11 inches, measured from riser to riser. Additionally, open risers are not permitted. Other stairs or steps provided in the pool are not required to meet these guidelines. Pool stairs must have handrails with a minimum width between the rails of 20 inches and a maximum of 24 inches. The 20- to 24-inch width for the accessible pool stairs is intended to provide support for individuals with disabilities who are ambulatory. Handrail extensions are required on the top landing of the stairs but are not required at the bottom landing. Handrails on pool stairs must comply with ADAAG provisions.