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Know the maximum allowed riser height to determine the rise and run of stairs. For a standard straight run of stairs in a residence, the maximum stair riser height is 7 3/4 inches, and the minimum tread depth is 10 inches. The risers is the vertical part of a step, and a tread is the horizontal part that you walk on. To calculate how many risers are needed, measure the floor-to-floor height in inches, then divide the height by 7 3/4. The result will likely be a fraction, so always round up.
This code states that you may have a maximum riser height of 7 3/4 inches and tread run of no less than 10 inches. Arke stairs has spiral and modular stair kits for the do-it-yourselfer.First determine the size of your stairwell, making sure to allow for the proper headroom to accommodate the stairs.nowing the number of risers tells you the number of treads â 15 (the sixteenth riser will be positioned approaching the upper floor with no tread on top). The run of the stair will then be 15 treads at 10 inches per tread, or 150 inches of total run.