Page 206 - 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
Two layers of / " Type X gypsum
1
2
wallboard applied with the long
dimension perpendicular to the I-joists
with end joints staggered. The base layer
5
is fastened with 1 / " Type S drywall
8
screws spaced 12" o.c. and the face layer
26. Wood I-joist (minimum I-joist is fastened with 2" Type S drywall screws
1
depth 9 / " with a minimum flange
4
spaced 12" o.c. in the field and 8" o.c. on
1
thickness of 1 / " and a minimum 26-1.1 the edges. Face layer end joints shall not — — — V a r i e s — — — 1
2
flange cross-sectional area of 2.25 occur on the same I-joist as base layer
square inches; minimum web thick-
ness of / ") @ 24" o.c. end joints and edge joints shall be offset
3
24" from base layer joints. Face layer to
8
1
also be attached to base layer with 1 / "
2
Type G drywall screws spaced 8" o.c.
placed 6" from face layer end joints. Face
layer wallboard joints to be taped and
covered with joint compound.
Minimum 0.019" thick resilient channel
16" o.c. (channels doubled at wallboard
end joints), placed perpendicular to the
joist and attached to each joist by 1 / "
1
4
1
Type S drywall screws. Two layers of / "
2
Type X gypsum wallboard applied with
the long dimension perpendicular to the
27. Wood I-joist (minimum I-joist resilient channels with end joints
staggered. The base layer is fastened
1
depth 9 / " with a minimum flange with 1 / " Type S drywall screws spaced
1
2
depth of 1 / " and a minimum 4
5
16
flange cross-sectional area of 1.95 27-1.1 12" o.c. and the face layer is fastened — — — V a r i e s — — — 1
with 1 / " Type S drywall screws spaced
5
square inches; minimum web thick- 12" o.c. Face layer end joints shall not
8
ness of / ") @ 24" o.c. occur on the same I-joist as base layer
3
8
end joints and edge joints shall be offset
24" from base layer joints. Face layer to
1
also be attached to base layer with 1 / "
2
Type G drywall screws spaced 8" o.c.
placed 6" from face layer end joints.
Face layer wallboard joints to be taped
and covered with joint compound.
(continued)

2018 INTERNATIONAL BUILDING CODE ® 179
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