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[BE] NOSING. The leading edge of treads of stairs and of landings at the top of stairway flights.
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504.5 General Site and Building Elements, Nosings
The radius of curvature at the leading edge of the tread shall be 1/2 inch (13 mm) maximum. Nosings that project beyond risers shall have ...
504.5 General Site and Building Elements, Nosings
Nosings shall comply with the following: Nosings within a stairway shall be uniform. If rounded, the radius of curvature at the leading edge ...
1011.5.5 Means of Egress, Nosing and Riser Profile
Nosings shall have a curvature or bevel of not less than 1/16 inch (1.6 mm) but not more than 9/16 inch (14.3 mm) from the foremost projection ...