15-8-420 Requirements for interior wall and ceiling finish.

   Materials used for interior wall and ceiling finish shall be not less resistant to flame spread than the class of materials specified in this section:

   (a)   Stairways, elevator shafts, and enclosed connections from such stairway to outside exits of all buildings, Class 1;

   (b)   Institutional units, Class 1;

   (c)   Residential units, Class 1;

   (d)   Business units, industrial and storage units, Class 2;

   (e)   Assembly and mercantile units having a capacity exceeding 100 persons, Class 1;

   (f)   Public lobbies required as a means of exit in buildings of all occupancies having a capacity of more than 100 persons, and in all public corridors required as a means of exit, Class 1;

   (g)   All other rooms and spaces, materials used for interior wall and ceiling finish shall be not less resistant to flame spread than Class 3 materials; provided, however, that Class 2 and Class 3 materials shall be limited in area as follows:

      (1)   The total surface area of Class 2 materials used for interior wall and ceiling finish in any building shall not exceed 7,500 square feet except that when a building is divided into areas separated by partitions, floor and ceiling construction providing fire resistance of not less than two hours with all partition openings protected by Class C fire doors, interior wall and ceiling finish of Class 2 materials not exceeding 7,500 square feet in surface area may be used in each area so separated,

      (2)   The total surface area of Class 3 material used for interior wall and ceiling finish in any building shall not exceed 5,000 square feet except that when a building is divided into areas separated by partition, floor and ceiling construction providing fire resistance of not less than two hours with all partition openings protected with Class C fire doors, interior wall and ceiling finish of Class 3 materials not exceeding 5,000 square feet in surface area may be used in each area so separated.

   Exception: In administrative offices, art galleries, libraries, and restaurants and also in not more than one room of each residential unit, Class 3, interior finish materials (not more combustible than wood) may be used on walls only, subject to the approval of the fire commissioner;

   (h)   The interior wall and ceiling in hazardous use units, now existing or hereafter constructed, shall be of noncombustible (Class I) construction;

   (i)   In buildings which are equipped with a standard sprinkler system as defined in Article II of Chapter 15-16 of this Code, Class 2.

(Prior code § 62-9.5; Amend Coun. J. 5-18-16, p. 24131, § 111)

15-8-430 Interior trim.

   Materials used for interior trim shall be not less resistant to flame spread than the class of materials specified in this section for the following rooms or spaces:

   (a)   Required stairway enclosures and enclosed connections from such stairways to outside exits, Class 1;

   (b)   Assembly rooms or spaces having a capacity exceeding 1,000 persons, Class 1;

   (c)   Materials used for interior trim in all other rooms and spaces shall be not less resistant to flame spread than Class 3 materials.

(Prior code §  62-9.6)

15-8-440 Floor coverings.

   All materials used as floor coverings shall comply with the following provisions:

   (a)   All floor coverings used in corridors, lobbies, stairs or other exit paths or exit areas in buildings used in whole or in those parts as occupancy Class A-2 shall meet Class A requirements.

   (b)   All floor coverings used in corridors, lobbies, stairs or other exit paths or exit areas in buildings used in whole or in those parts as occupancy Class E shall meet Class B requirements.

   (c)   All floor coverings used in buildings used in whole or in part as occupancy Class B or C shall meet Class A requirements.

   (d)   Floor coverings used in occupancies or areas other than as listed above need not be classified.

(Prior code §  62-9.7; Amend Coun. J. 6-27-90, p. 17610)

15-8-450 Flooring.

   Finished flooring of wood or other combustible materials shall comply with the requirements of Sections 15-8-460 to 15-8-500, inclusive.

(Prior code §  62-10)

15-8-460 Sleepers.

   When finished flooring or subflooring is attached to combustible sleepers, such sleepers shall be fire- stopped at intervals under the flooring not exceeding 100 square feet in area, and no open spaces shall extend under or through permanent walls or partitions.

(Prior code §  62-10.1)

15-8-470 Insulation.

   In all cases where finished flooring is applied directly to the floor construction or to sleepers, a resilient insulating base not exceeding one-half inch in thickness and applied directly to the floor construction shall be permitted.

(Prior code §  62-10.2)

15-8-480 Fire-resistive or noncombustible construction.

   (a)   In buildings of fire-resistive or noncombustible construction, all wood flooring and subflooring shall be applied directly to a floor construction of noncombustible material or may be attached to sleepers of combustible material. In buildings exceeding 100 feet in height, the space between the floor construction and the finished flooring shall be solidly filled with noncombustible materials.

   (b)   Combustible composition flooring not exceeding one-half inch in thickness may be applied directly to the noncombustible floor construction or to subflooring.

   (c)   When the subflooring and the structural elements are of fire-retardant treated wood, the space between the floor construction and the subflooring need not be filled.

(Prior code §  62-10.3)