§ 4-243. Building Planning; Section R-311, Means of Egress.

(a)

Section R-311.4.5, Minimum Number of Exits in Existing One-and Two-Family Dwellings. One- and two-family dwellings that undergo basement improvements for which a building permit is required shall have a minimum of two (2) exits. All basements and cellars, must have a basement or cellar exit door or an emergency escape and rescue opening leading directly to the outside grade and additionally an interior stair leading to the primary means of egress of the dwelling unit.

(b)

Section R-311.7.5, Stair Treads and Risers. The maximum riser height shall be eight and one-fourth (8¼) inches, and the minimum tread depth shall be nine (9) inches. The riser height shall be measured vertically between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge. The walking face of treads and landings of a stairway shall be sloped no steeper than one (1) unit vertical in forty-eight (48) units horizontal two percent (2%) slope. The greatest riser height within any flight of stairs shall not exceed the smallest by more than three-eighths (3/8) inch. The greatest tread depth within any flight of stairs shall not exceed the smallest by more than three-eighths (3/8) inch.

(CB-90-2015)