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A set of stairs has a run of 10.25 inches and a rise of 7.25 inches. How much horizontal space is required to connect two floors, 3 feet 1/4 inch apart in height?
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A set of stairs has a run of 10.25 inches and a rise of 7.25 inches. How much horizontal space is required to connect two floors, 3 feet 1/4 inch apart in height?

User Deltaluca
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The 4 treads require 4*10.25 = 41 inches, but you also require landings at each level, adding perhaps 72 inches. (Building codes vary.)

Somewhere between 41 and 113 inches of horizontal space will be required, perhaps more.
User Wondim
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