Do stair tread edges have to be rounded?
Wednesday, March 18, 2020
There is no requirement for the leading edge of a stair tread to be rounded, but a number of good reason why it should be. Most stair residential stair treads are wood and rounding reducing the incidence of splintering of the edge. Also, a square edge does not hold a finish well and may be more likely to catch a dragging heel.
A maximum radius is specified in the code, however, for any stair nosing (extension of the tread past the face of the riser below). The International Residential Code (IRC 3126.96.36.199) states that “the radius of curvature at the nosing shall not be greater than 9/16 inch."
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