Chicago building code stair treads
City Porches specializes in Chicago Building code violations for stir Requirements in Commercial and residential multi-unit apartment buildings.
10(13-160-300) a) In Institutional and Assembly units the maximum height of a riser shall be seven and one-half inches, and the minimum width of a tread, exclusive of nosing, shall be 10 inches
b) In all other occupancies the maximum height of a riser shall be eight inches, and the minimum width of a tread, exclusive of nosing, shall be not less than 9 inches
d) Winders shall not be permitted in stairs required as exits except in Single-Family and Two-Family dwellings. The width of a tread of a winder measured at a distance of 18 inches from the inside railing shall be not less than 9 inches nor less than the treads of the flight below or above the winding section.