See the two sections referenced from Code:
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18-28-302.1 Penetrations of floor/ceiling assemblies and fire-resistance-rated assemblies.
Penetrations of floor/ceiling assemblies and assemblies required to have a fire-resistance rating shall be protected in accordance with Chapters 15-8
, Fire-Resistive Requirements, and 15-12
, Fire Resistive Materials and Construction.
Under Highrise Section: 13-76-100 Exceptions.
(a) An approved standard automatic sprinkler system which is supervised shall be provided throughout the building. The system shall be designed in accordance with chapter 15-16
of this Code and shall be provided with a two-source water supply when the building height exceeds three hundred feet.
(b) The mechanical air handling equipment serving the fire
zone shall be designed to provide maximum exhaust without recirculation and to be activated by the water flow device serving that fire
zone. This requirement will not apply to residential occupancies.
(c) When a standard sprinkler system is installed the following are permitted:
(1) The floor construction fire
rating may be reduced to one hour for Types I-A and I-B construction from the present requirement of Table 49-8 codified in Section 13-60-100
of this Code. Floor construction for the purposes of this section shall meet the following requirements:
(A) For concrete construction as provided for in Chapter 13-136
of this Code the minimum slab thickness shall be three inches for lightweight concrete and four inches for stone concrete construction;
(B) For steel deck construction as provided for in Chapter 13-148
of this Code the minimum depth of concrete above the uppermost surface of the steel deck shall be two and one-half inches for lightweight concrete and three and one-half inches for stone concrete;
(2) The public corridor partition fire
rating may be reduced to noncombustible from the present requirements of Section 15-8-240
(a)(1) of this Code;
(3) The area separations may be eliminated as presently required in Section 15-8-240
(a)(2) of this Code;
(4) Atriums are allowed when provided with automatic smoke and heat venting activated by approved products of combustion detectors. Size of vents shall be calculated as follows:
A = Vent area requires
P = Perimeter of atrium
H = Distance from atrium floor to first enclosed floor above
D = Distance from floor of atrium to roof of atrium minus H
Location and installation of vents to be approved by the Bureau of Fire
(5) The elevator shaft enclosure may be eliminated when the elevators are incorporated in atriums;
(6) The fire
rating of exterior nonbearing walls of buildings of Types I-A, I-B and I-C may be reduced to noncombustible from the present requirements of Table 49-8(d) codified in Section 13-60-100
of this Code;
(7) Smokeproof towers as presently required in Section 13-160-360
of this Code may be eliminated;
(8) Fire dampers
will not be required in mechanical heating, ventilation and air conditioning systems;
(9) The one and one-half-inch hose connection and valve presently required in Sections 15-16-370
of this Code may be eliminated.
(Prior code § 62.1-10; Amend Coun. J. 4-25-84, p. 6189; Amend Coun. J. 1-18-89, p. 23794; Amend Coun. J. 6-14-95, p. 2841; Amend Coun. J. 10-30-96, p. 31216)