(1) Ceiling height. Habitable rooms in all occupancies shall have a ceiling height of not less than seven feet. In rooms with sloping ceilings, the required ceiling height shall be provided in at least 50 percent of the room, and no portion of any room having a ceiling height of less than five feet shall be considered as contributing to the minimum areas required by subsection (b)(2) of this section.

(2) Net floor area. Every dwelling unit shall have at least one habitable room which shall have not less than 130 square feet of floor area. Every room which is used for both cooking and living or both cooking and sleeping purposes shall have not less than 150 square feet of net floor area. Every room used for sleeping purposes shall have not less than 70 square feet of net floor area. Where more than two persons occupy a room used for sleeping purposes, the required net floor area shall be increased at the rate of 50 square feet for each occupant in excess of two.

(3) Width. No room used for living or sleeping purposes shall be less than seven feet in any dimension and no water closet space shall be less than 27 inches in width.

(1) Window and openable window area. Every habitable room shall be provided with windows or skylights with an area of not less than eight percent of the floor area of such rooms, with such rooms having not less than 40 percent of the required window area being openable to the outside, provided that basements may be used for recreation rooms and supplemental bedrooms by occupants belonging to the same family as use the principal portion of the building. Such basement rooms shall be provided with windows with an area not less than three square feet or 1/30 of the floor area of such rooms with not less than one-half of the required window area being openable.

(2) Screens. Screens shall be provided for any opening required for ventilation purposes. All required screens shall be in good repair and free from tears, holes or other imperfections of either screen or frame that would admit insects such as flies, mosquitoes, or other vermin detrimental to the health of occupants. All window screens shall be provided with framing devices to permit removal for cleaning and maintenance. Window screening shall contain a minimum of 14 by 18 mesh per square inch opening with mesh screening, but the city manager may approve alternate forms of screening if they provide protection from insects or vermin.

(3) Mechanical ventilation. An approved system of mechanical ventilation or air conditioning may be used in lieu of open windows. Such system shall provide not less than four air changes per hour, except that in toilet compartments such system shall provide a complete air change every five minutes. Toilet compartments and bathrooms ventilated in accordance with this subsection may be provided with artificial light.

(4) Hallways. All public hallways, stairs, and other exitways shall be lighted at all times with illumination of not less than five footcandles at floor level.

(5) Maintenance. Windows shall be soundly and adequately glazed, free from loose and broken glass and cracks that would cause physical injury to persons or allow the elements to enter the structure or allow excessive heat loss from within.

(1) Dwelling units. Every dwelling unit shall be provided with a water closet, a lavatory and a bathtub or shower.

(2) Water closet. Every dwelling shall contain a room completely enclosed by partitions, doors, or windows from floor to ceiling and wall to wall that is equipped with a flush water closet in good working condition and properly connected to an approved water and sewer system. Every flush water closet shall have an integral water-seal trap and shall be provided with an integral flushing rim constructed so as to flush the entire interior of the bowl. Water closets shall have smooth, impervious, easily cleanable surfaces that are free from cracks, breaks, leaks, and jury-rigged repairs and shall be equipped with seats and flush tank covers constructed of smooth materials that are free of cracks and breaks and that are impervious to water.

(3) Lavatory basin. Every dwelling shall contain a lavatory basin in good working condition and properly connected to an approved water closet or as near to that room as practicable. Whenever a dwelling contains a flush water closet in more than one room, it shall also contain a lavatory basin in each room with the flush water closet or as near to each such room as practicable. Lavatory basin surfaces shall be smooth, unbroken, easily cleanable, and impervious to water and grease. Plastic and concrete laundry tubs, sinks used for kitchen purposes, and bathtubs are not acceptable substitutes for lavatory purposes.

(4) Bath or shower. Every dwelling shall contain within a room completely enclosed by partitions, doors, or windows from floor to ceiling and wall to wall a bathtub or shower in good working condition and properly connected to an approved water and sewer system. Every bathtub shall have a smooth, impervious, and easily cleanable inner surface free from cracks, breaks, leaks, and makeshift or jury-rigged repairs. Every shower compartment shall have a leakproof base whose pitch is sufficient to drain completely. The interior walls and ceiling surfaces of the shower cabinet or compartment shall be made of smooth, nonabsorbent material free of sharp edges. Finishes of walls and ceilings that peel readily are not acceptable. The top of shower compartments or cabinets shall not be less than six feet above the floor. The interior of every shower compartment shall be watertight, maintained in good repair, and easily cleanable. Built-in bathtubs with overhead showers shall have waterproof joints between the tub and adjacent walls and waterproof walls.

(5) Building drain. Any structure on which a building drain is installed shall have at least one stack vent or vent stack carried full size through the roof that is at least three inches in diameter. All exterior openings provided for the passage of piping shall be properly sealed with snug fitting collars of metal or other ratproof material securely fastened into place.

(6) Water. Potable water shall be provided for all dwelling units. Potable and nonpotable water supplies shall be distributed through systems entirely independent of each other. There shall be no actual or potential cross connections between such supplies. Potable water supply piping, water discharge outlets, backflow prevention devices, or similar equipment shall not be located so as to make possible their submergence in any contaminated or polluted substance.

(7) Backflow. Every fixture supply pipe shall be protected from backflow. Backflow shall be prevented by either the minimum required air gap or a backflow preventer. (Ord. No. 2006-78, § 1(Exh. A), 1-8-2007)