Basements shall not be deemed habitable unless all of the following conditions shall be met: Such room shall be at least seven feet six inches in height in every part from the finished floor to the ceiling. Ceilings of such rooms shall be at least three feet six inches above the surface of the street, alley, yard or court adjoining the same. There shall be appurtenant to such room if used for sleeping purposes the use of a water closet. Every room shall have a window or windows opening upon the street, an alley or upon a yard or court. The total area of windows in every room shall be at least one-eighth (1/8) of the floor area of the room, and the sash shall be made to open the full width, and the top of each window shall be within six inches of the ceiling. All exterior walls surrounding such room shall be dampproof. The floor of such room shall be dampproof and waterproof.
Public space shall have a minimum height of seven feet six inches measured from finished floor to finished ceiling.
Nonhabitable space, except crawl spaces and attics, in multiple dwellings shall have a minimum height of seven feet measured from floor to ceiling.
One- and two-family dwellings exceeding three stories in height shall have exits from every story which shall provide safe continuous passage to a legal open space and which shall comply with one of the following requirements:
A. One interior stairway enclosed in a fire separation having a fire resistance rating of at least one hour. All openings in such enclosures shall be provided with a self-closing opening protective as set forth in the following table:
| Opening Protectives For Interior wall Openings |
---|
| Fire-resistance rating of wall separation in which opening occurs, in hours | Fire-resistance rating of opening protective, in hours |
---|
| 2 or more | 1 1/2 |
| 1 or 3/4 | 1 |
B. Two interior stairways with all doors opening upon such stairways equipped with a self-closing device.
C. One interior stairway with all doors opening upon such stairway equipped with a self-closing device and one exterior stairway or fire escape providing exit from each dwelling unit on any story.
D. One interior stairway equipped with an automatic sprinkler system, with all doors opening upon such stairway equipped with a self-closing device.