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(2) Except for Type I Construction, the location, size, and spacing of such glazed openings do
not exceed the values set forth by the Secretary.
(3) Plastics used in glazed openings for Type II Construction shall be materials appropriate for
use according to flame-spread characteristics and the location, size, and spacing of the openings do not
exceed the values set forth by the Secretary.
SECTION 1604. Skylights
(a) General – Approved plastics may be used in skylights installed on the roofs of Types I, II or
III constructions and all buildings in these categories shall be equipped with an approved automatic fireextinguishing 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) Plastics shall be used in approved skylights in Type II one-hour fire-resistive construction
which are located 300 millimeters or more above the lower flange of the ceiling. The walls of the
skylight well shall be no less fire-resistive than the adjacent ceiling.
(3) Where a 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
(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
meter. 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 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.
SECTION 1605. Light-Transmitting Panels in Monitors and Sawtooth Roofs
(a) General – Where a fire-resistive rating is not required for the roof structure and in all
buildings provided with an approved automatic fire-extinguishing system, approved plastics may be used
with or without sash as the light-transmitting medium in monitors and sawtooth; Except, that plastics
used in monitors or sawtooth roofs of Type II Construction shall be of materials appropriate to be used
according to flame-spread characteristics.
(b) Allowable areas – The area of individual plastic glazing used in monitors and sawtooth
glazing shall not exceed 15.00 square meters. The total aggregate area of plastics used in skylights,
monitors, and sawtooth glazing shall not exceed twenty perc...
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- Fall '12
- Building code, Building officials