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When it comes to residential stair standards, the 2021 International Residential Code (IRC) establishes minimum requirements for stairs to insure a level of safety to the public. Several components are looked at such as stair width, headroom, riser and tread heights.
Aug 1, 2011 · The general rule (in the US) is 7-11 (a 7 inch rise and 11 inch run) (17.78cm-27.94cm). More exactly, no more than 7 3/4 inches (19.7cm) for the riser (vertical) and a minimum of 10 inches (25.4cm) for the tread (horizontal or step). You can find some more information here as well on other stair-related dimensions.
This stair calculator computes stair parameters such as rise, total run, angle, and stringer length based on the height, run, tread, and headroom requirements.
This article provides building code specifications, sketches, photographs, and examples of the proper stair step height or stair riser dimensions and other stair riser requirements for indoor or outdoor stairways.
Here we describe the recommended measurements for stair building that give a good starting point from which you can adapt the stairs to your specific need in total stair rise or height and run or length.
Standard straight-run stair dimensions have a width of 36 inches or 91.4 centimeters, a tread depth of 11 inches or 28 centimeters, a riser size of 7 inches or 18 centimeters, and a length from the bottom to the top of 10 feet or 3 meters.
Jan 8, 2021 · The 2018 IBC building code for rise and run of stairs is a maximum 7″ rise and minimum 11″ run (tread depth). The OSHA standard for rise and run of stairs is maximum 9.5″ rise and minimum 9.5″ run (tread depth). The IBC maximum rise of a single stair flight is 12.’.
