Stair landings a required for 12′ (3658mm) vertical stairs inclines and must be at least as deep as the stairs are wide (up to 4′-0″). Where a door opens into the landing it can’t project more than 7″ (178mm)into the required depth of the landing. ErectaStep commercial stairs with winders will be custom orders. ![]() ![]() Stairs with winders need to be at least 11″ (279mm) deep and when 12″ (305mm) in from the narrow edge and the minimum depth must be 10″ (254mm). The riser height must be between 4″ (102mm) and 7″ (178mm) and the treads must be at least 11″ (279mm) deep. ![]() Stairways have to be at least 44″ (1118mm) if occupant load is over 50 and 36″ (914mm) width if under 50 occupants you can go to. Stairs must have at least 80″ of head height measured off the tread nosings and it needs to be maintained for one additional riser depth at the bottom of the stairs. It is much more complex, but these are the general rules. Our metal stairs are IBC Compliant… are yours? International Building Code Guidelines overview for commercial buildings and common stairs in buildings.
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