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What is the maximum height of a step (riser) on a stair?
Saturday, February 29, 2020
The maximum height of a riser is 7-3/4 inches according to the International Residential Code (IRC 322.214.171.124), as measured between the leading edges of adjacent treads. Also, the maximum allowable variation between riser heights is 3/8 inch. Also, see our blog post What is the steepest residential stair allowed?
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