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What is code for stair risers?
Sunday, March 15, 2020
The maximum riser (vertical part) of a stair is 7-3/4” according to the International Residential Code (IRC R322.214.171.124). Combine that 7-3/4” riser with a 10” minimum tread (horizontal part) and you have the steepest stair allowed by code. However, when a tread is less than 11” you must make up the difference with a nosing (extension over the face of the riser below). In this case it would be 1”. See our blog post When is a nosing required on a stair tread? for more on this.
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