Page 202 - 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 MINIMUM THICKNESS OF
OR 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
14. Plywood
stressed skin panels
consisting of / " - 1 / " -thick wood fiberboard weighing 15 to 18 pounds per
5
8
thick interior C-D cubic foot installed with long dimension parallel to string-
2
(exterior glue) top ers or / " C-D (exterior glue) plywood glued and/or nailed
3
stressed skin on 2" × to stringers. Nailing to be with 5d cooler or wallboard o
8
o
6" nominal (mini- 14-1.1 nails at 12" on center. Second layer of / " Type X gypsum — — — — — — — 1
1
mum) stringers. wallboard applied with long dimension perpendicular to
2
c
Adjacent panel joists and attached with 8d cooler or wallboard nails at 6"
o
o
edges joined with 8d on center at end joints and 8" on center elsewhere. Wall-
common wire nails board joints staggered with respect to fiberboard joints.
spaced 6" on center.
Stringers spaced 12"
maximum on center.
15. Vermiculite con-
crete slab propor-
tioned 1:4 (Portland
cement to vermicu-
lite aggregate) on a
1 / " -deep steel
1
2
deck supported on
individually pro-
tected steel framing.
Maximum span of 15-1.1 None — — — 3 j — — — —
deck 6-10" where
deck is less than
0.019 inch (No. 26
carbon steel sheet
gage) or greater.
Slab reinforced with
4" × 8" 0.109/0.083"
(No. / B.W. gage)
12
14
welded wire mesh.
16. Perlite concrete
slab proportioned
1:6 (Portland cement
to perlite aggregate)
on a 1 / " -deep steel
1
4
deck supported on 16-1.1 None — — — 3 / — — — —
1 j
individually pro- 2
tected steel framing.
Slab reinforced with
4" × 8" 0.109/0.083"
12
(No. / B.W. gage)
14
welded wire mesh.
(continued)

2018 INTERNATIONAL BUILDING CODE ® 175
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