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The minimum width of stairways is 36. Handrails may project into the required width a distance of 3 Â½ from each side of a stairway. Stringers and other projects such as trim and similar decorative features may project into the required width 1 Â½ on each side.
The rule of thumb for step dimensions is that the combined depth and height work best when they are closest to a total of 18 inches. So, if your steps are 10 inches deep, 8 inches high is the optimum riser height. For oversized steps, the depth should be increased, with the height of each step being reduced.If the tread is 12 inches deep, the riser should be close to 6 inches. The minimum height for any step should be at least 4 inches. Determine your optimum step depth and subtract it from 18.Divide the height of your deck by the answer. Add any remainder to the bottom step.f the tread is 12 inches deep, the riser should be close to 6 inches. The minimum height for any step should be at least 4 inches. Determine your optimum step depth and subtract it from 18. Divide the height of your deck by the answer. Add any remainder to the bottom step.