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This stair calculator computes stair parameters such as rise, total run, angle, and stringer length based on the height, run, tread, and headroom requirements.
Stair widths in construction are crucial in ensuring safety, accessibility, and efficient flow of foot traffic. In residential settings, stairs are generally narrower, catering to fewer occupants. Conversely, in commercial or public buildings, wider stairs are necessary for larger numbers of people.
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. Stair width is the length of a step from side to side.
This document provides the stair dimensions required by building code specifications and includes sketches, photographs, and examples of defects used in inspecting indoor or outdoor stairs, railings, landings, treads, and related conditions for safety and proper construction.
Discover the code standards for residential stairs, including dimensions and safety regulations according to the 2021 International Residential Code.