How far should stair nosing stick out?
Sunday, March 22, 2020
A nosing should not extend past the face of the riser below it less than 1/4 inch or more than 1-1/4 inch, according to the International Residential Code (IRC R3188.8.131.52). A nosing is not required for treads 11 inches or more. Since the minimum size tread is 10 inches, this means that treads between 10 and 11 inches need a nosing to provide additional surface for a shoe heel on the tread.
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