Page 205 - 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
5
Base layer / " Type X gypsum board
8
applied at right angles to steel framing 24"
22. Steel joists, floor trusses and flat on center with 1" Type S drywall screws
or pitched roof trusses spaced a spaced 24" on center. Face layer / " Type
5
1
maximum 24" o.c. with / " wood X gypsum board applied at right angles to
8
2
structural panels with exterior glue steel framing attached through base layer
applied at right angles to top of joist 22-1.1 with 1 / " Type S drywall screws 12" on — — — V a r i e s — — — 1 1 /
5
or top chord of trusses with No. 8 center at end joints and intermediate joints 4
8
screws. The wood structural panel and 1 / " Type G drywall screws 12 inches
1
thickness shall be not less than nom- on center placed 2" back on either side of
2
1
inal / " nor less than required by face layer end joints. Joints of the face
2
Chapter 23.
layer are offset 24" from the joints of the
base layer.
23. Wood I-joist (minimum joist
depth 9 / " with a minimum flange 1 / " deep single leg resilient channel 16" on
1
4
depth of 1 / " and a minimum center (channels doubled at wallboard end
5
2
16
flange cross-sectional area of 2.25 joints), placed perpendicular to the furring
square inches) at 24" o.c. spacing strip and joist and attached to each joist by
with a minimum 1 × 4 ( / " × 3.5" 1 / " Type S drywall screws. / " Type C
3
7
5
4
actual) ledger strip applied parallel 23-1.1 gypsum wallboard applied perpendicular — — — V a r i e s — — — 5 /
8
8
to and covering the bottom of the to the channel with end joints staggered 8
bottom flange of each member, not less than 4 and fastened with 1 / "
1
tacked in place. 2" mineral wool Type S drywall screws spaced 7" on cen-
8
insulation, 3.5 pcf (nominal) ter. Wallboard joints to be taped and cov-
installed adjacent to the bottom ered with joint compound.
flange of the I-joist and supported by
the 1 × 4 ledger strip.
Minimum 0.026" thick hat-shaped channel
16" o.c. (channels doubled at wallboard
24. Wood I-joist (minimum I-joist end joints), placed perpendicular to the
depth 9 / " with a minimum flange joist and attached to each joist by 1 / "
1
1
4
depth of 1 / " and a minimum flange Type S drywall screws. / " Type C gyp-
1
4
5
2
cross-sectional area of 5.25 square 24-1.1 sum wallboard applied perpendicular to — — — V a r i e s — — — 5 /
8
inches; minimum web thickness of 8
1
3 / ") @ 24" o.c., 1 / " mineral wool the channel with end joints staggered and
1
8
2
insulation (2.5 pcf-nominal) resting fastened with 1 / " Type S drywall screws
8
spaced 12" o.c. in the field and 8" o.c. at
on hat-shaped furring channels.
the wallboard ends. Wallboard joints to be
taped and covered with joint compound.
Minimum 0.019" thick resilient channel
16" o.c. (channels doubled at wallboard
25. Wood I-joist (minimum I-joist end joints), placed perpendicular to the
1
depth 9 / " with a minimum flange joist and attached to each joist by 1 / "
5
4
1
depth of 1 / " and a minimum flange Type S drywall screws. / " Type C gyp-
8
5
2
cross-sectional area of 5.25 square 25-1.1 sum wallboard applied perpendicular to — — — V a r i e s — — — 5 /
8
inches; minimum web thickness of 8
7 / ") @ 24" o.c., 1 / " mineral wool the channel with end joints staggered and
1
16
2
insulation (2.5 pcf-nominal) resting fastened with 1" Type S drywall screws
spaced 12" o.c. in the field and 8" o.c. at
on resilient channels.
the wallboard ends. Wallboard joints to be
taped and covered with joint compound.
(continued)
178 2018 INTERNATIONAL BUILDING CODE ®
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