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Interior wall and ceiling finishes, as herein referred to, are defined as those materials applied over wall, partition and ceiling construction on the inside of a building or subdivision thereof including finishes utilized for decoration, acoustical correction, surface insulation and similar purposes. Wall finishes not exceeding 20 percent of the wall area and ceiling finishes not exceeding ten percent of the ceiling area of a room or space shall be classified as interior trim. Surface decoration consisting of paint, paper or similar surface treatment less than one-twenty-eighth-inch thickness, applied directly to the finish without intervening air space shall not be considered as a part of interior wall and ceiling finish unless such surface treatment is required for the purpose of increasing fire resistance.
(Prior code § 62-9.1)
Interior trim, as herein referred to, is defined as including moldings, cornices, wainscoting and other wall and ceiling finishes not exceeding 20 percent of the wall area or ten percent of the ceiling area of a room or space. Interior trim shall not include the following:
(a) Doors and frames;
(b) Window sash and frames;
(c) Casings not exceeding four inches in width around door and window openings;
(d) Baseboards not exceeding six inches in height.
(Prior code § 62-9.2)
(a) All materials used for interior wall and ceiling finish and for interior trim shall be classified in accordance with flame spread characteristics into the following classifications:
Classification | Flame Spread Rating | Smoke Developed |
Class 1 | 0 to 25 | 200 |
Class 2 | 26 to 75 | 450 |
Class 3 | 76 to 200 | 450 |
(b) The classification of any specific material shall be determined in accordance with test procedure as provided in Section 15-12-320.
(c) All materials used as floor covering shall be classified in accordance with the critical radiant flux characteristics as follows:
Class A interior floor finish: Critical radiant flux of 0.45 watts per square centimeter or higher.
Class B interior floor finish: Critical radiant flux between 0.22 watts per square centimeter and 0.44 watts per square centimeter.
Wherever the use of Class B interior floor finish is required, Class A interior floor finish material is permitted.
(d) The classification of specific floor covering materials shall be in accordance with test procedures as provided for in Section 15-12-344.
(Prior code § 62-9.3; Amend Coun. J. 6-27-90, p. 17610)
Except in buildings of Type III-A, III-C or IV-B construction, all interior wall and ceiling finish shall be applied directly and securely to a noncombustible base or to furring or nailing strips not exceeding one inch in nominal thickness applied over a noncombustible base with all spaces behind the material filled with noncombustible material or firestopped at intervals not exceeding eight square feet in area. In buildings of Type III-A construction, interior wall and ceiling finish shall be applied directly to the wall or floor construction.
(Prior code § 62-9.4)
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)
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)
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