Page 200 - 2018_Complete_14_Collection (1)_Neat

FIRE AND SMOKE PROTECTION FEATURES

TABLE 721.1(3)—continued
MINIMUM PROTECTION FOR FLOOR AND ROOF SYSTEMS a, q
THICKNESS OF FLOOR OR MINIMUM THICKNESS OF
ROOF SLAB CEILING
FLOOR OR ROOF ITEM CEILING CONSTRUCTION (inches) (inches)
CONSTRUCTION NUMBER
4 3 2 1 4 3 2 1
hours hours hours hour hours hours hours hour
Suspended ceiling of vermiculite gypsum plaster base coat
and vermiculite acoustical plaster on metal lath attached at
9. 3" deep cellular 6" intervals to / " cold-rolled channels spaced 12" on
3
4
steel deck with center and secured to 1 / " cold-rolled channels spaced 36"
1
1
/
2
concrete slab on 9-1.1 on center with 0.065" (No. 16 B.W. gage) wire. 1 / " 2 / 2 — — — 1 1 k — — —
1
8
top. Slab thickness channels supported by No. 8 gage wire hangers at 36" on
2
measured to top. 1
center. Beams within envelope and with a 2 / " airspace
2
between beam soffit and lath have a 4-hour rating.
1
10. 1 / "-deep steel
2
roof deck on steel
framing. Insulation
board, 30 pcf Ceiling of gypsum plaster on metal lath. Lath attached to
density, composed 3 / " furring channels with 0.049" (No. 18 B.W. gage) wire
of wood fibers ties spaced 6" on center. / " channel saddle tied to 2"
4
3
with cement channels with doubled 0.065" (No. 16 B.W. gage) wire
4
binders of 10-1.1 ties. 2" channels spaced 36" on center suspended 2" below — — 1 7 / 8 1 — — 3 l / 4 3 / 4 l
thickness shown steel framing and saddle-tied with 0.165" (No. 8 B.W.
bonded to deck gage) wire. Plaster mixed 1:2 by weight, gypsum-to-sand
with unified aggregate.
asphalt adhesive.
Covered with a
Class A or B roof
covering.
1
11. 1 / "-deep steel Ceiling of gypsum plaster on metal lath. Lath attached to
2
roof deck on steel- 3 / " furring channels with 0.049" (No. 18 B.W. gage) wire
4
3
framing wood fiber ties spaced 6" on center. / " channels saddle tied to 2"
4
insulation board, channels with doubled 0.065" (No. 16 B.W. gage) wire
17.5 pcf density on 11-1.1 ties. 2" channels spaced 36" on center suspended 2" below — — 1 1 / 1 — — 7 g / 3 / l
top applied over a steel framing and saddle tied with 0.165" (No. 8 B.W. 2 8 4
15-lb asphalt- gage) wire. Plaster mixed 1:2 for scratch coat and 1:3 for
saturated felt. brown coat, by weight, gypsum-to-sand aggregate for 1-
Class A or B roof hour system. For 2-hour system, plaster mix is 1:2 by
covering. weight, gypsum-to-sand aggregate.
(continued)

2018 INTERNATIONAL BUILDING CODE ® 173
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