When is a nosing required on a stair tread?
Saturday, February 29, 2020
A nosing (extension of the tread leading edge past face of riser below it) is required for stair treads less than 11 inches in depth to create a minimum tread surface of at least 11 inches (IRC 322.214.171.124). Since the minimum tread depth by code is 10 inches, any tread of 10 inches or more and less than 11 inches would need a nosing. The nosing cannot project less the 3/4 inch or more than 1-1/4 inch.
Occasionally we come across an extremely steep stair with a nosing that exceeds the safe maximum of 1-1/4 inch, like in the photo below, which overhangs 2-1/2 inch.
Also, see our blog post What is the steepest residential stair allowed?
Here’s links to a collection of our other blog posts about STAIRS:
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