Code of Massachusetts Regulations
521 CMR - Architectural Access Board
Title 521 CMR 27 - STAIRS
Section 27.3 - NOSINGS
Universal Citation: 521 CMR 27 MA Code of Regs 27.3
Current through Register 1531, September 27, 2024
The undersides of nosings shall not be abrupt. The radius of curvature at the leading edge of the tread shall be no greater than 1/2 inch (1/2" = 13mm). Risers shall be sloped or the underside of the nosing shall have an angle not less than 60 degree from the horizontal. Nosings shall project no more than 11/2 inches (11/2" = 38mm). See Fig. 27b.
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