Section 150.620 - Stairs and Stairways(A) Surfaces of treads and landings shall be constructed and maintained so as to prevent slipping.(B) Handrails shall be provided on both sides of all indoor and outdoor stairways. Specifications as to height, width and anchorage as listed in 105 CMR 150.600(B) shall apply. They shall have curved returns.(C) Steps in stairways shall not have abrupt (square) nosing, and risers shall be tapered back approximately 11/2 inches at bottom of each riser. Risers where possible should not exceed seven inches.Adopted by Mass Register Issue 1361, eff. 3/23/2018.