Section 1604
SECTION 1604. Skylights. (a) General. Approved plastics may be used in skylights installed on roofs of Types I, II, or III constructions and all buildings in these categories shall be equipped with an approved automatic fire-extinguishing system in Groups A, B, C, E, F, J, H-3 and H-4 Occupancies: Except, that: (1) Approved plastics may be used in any type of construction or occupancy as a fire venting system when approved by the Building Official. (2) Plastic may be used in approved skylights in Type II one-hour fire-resistive construction which are located 300 millimeters or more above the lower place of the ceiling. The walls of the skylight well shall be no less fire-resistive than the adjacent ceiling. (3) Where fire-resistive ceiling is not required in one-storey buildings, approved plastics may be used in skylights. (b) Installation Requirements. (1) Except in Group A Occupancies, no skylight shall be installed within 3.00 meters of a property line. (2) The edges of dome-type skylights shall be properly flashed. (3) Plastic skylights shall be separated from each other by at least 2.50 meters laterally and 3.00 meters along the slope of the roof. (c) Allowable areas. The area of individual plastic skylights shall not exceed 10.00 square meters. The total aggregate area of plastics used in skylights, monitors, and sawtooth glazing shall not exceed twenty percent of the floor area of the room or occupancy sheltered. (d) Curb Requirements. Plastic skylights in roofs having a slope of less than 1 in 3 shall have a 100 millimeters high curb. The curb may be omitted where a wire screen not smaller than No. 12 U.S. gauge with a mesh not larger than 25 millimeters is provided immediately below the skylight. The screen shall be substantially mounted below the skylight.