Page 207 - 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
FLOOR OR ROOF ITEM CEILING CONSTRUCTION ROOF SLAB (inches) CEILING (inches)
CONSTRUCTION NUMBER 4 3 2 1 4 3 2 1
hours hours hours hour hours hours hours hour
Base layer of / " Type C gypsum
5
8
wallboard attached directly to I-joists
5
with 1 / " Type S drywall screws
8
spaced 12" o.c. with ends staggered.
Minimum 0.0179" thick hat-shaped / -
7
8
inch furring channel 16" o.c. (channels
doubled at wallboard end joints),
28. Wood I-joist (minimum I-joist placed perpendicular to the joist and
depth 9 / " with a minimum flange attached to each joist by 1 / " Type S
1
5
4
1
depth of 1 / " and a minimum flange drywall screws after the base layer of
8
2
cross-sectional area of 2.25 square gypsum wallboard has been applied.
inches; minimum web thickness of 5 3
3 / ") @ 24" o.c. Unfaced fiberglass 28-1.1 The middle and face layers of / " Type — — — V a r i e s — — 2 / 4 —
8
8
insulation or mineral wool insulation C gypsum wallboard applied
perpendicular to the channel with end
is installed between the I-joists joints staggered. The middle layer is
supported on the upper surface of the fastened with 1" Type S drywall screws
flange by stay wires spaced 12" o.c.
spaced 12" o.c. The face layer is
applied parallel to the middle layer but
with the edge joints offset 24" from
those of the middle layer and fastened
5
with 1 / " Type S drywall screws 8" o.c.
8
The joints shall be taped and covered
with joint compound.
Base layer / " Type X gypsum board
5
8
applied perpendicular to bottom of
1
framing members with 1 / " Type S-12
8
5
screws spaced 12" o.c. Second layer / "
8
Type X gypsum board attached
perpendicular to framing members with
29. Channel-shaped 18 gage steel 1 / " Type S-12 screws spaced 12" o.c.
5
8
joists (minimum depth 8") spaced a Second layer joints offset 24" from base
maximum 24" o.c. supporting layer. Third layer / " Type X gypsum
5
8
tongue-and-groove wood structural board attached perpendicular to framing
panels (nominal minimum / " thick) 29-1.1 members with 2 / " Type S-12 screws — — V a r i e s — — — 3 3 / 8 —
3
3
8
4
applied perpendicular to framing spaced 12" o.c. Third layer joints offset
members. Structural panels attached 12" from second layer joints. Hat-
7
with 1 / " Type S-12 screws spaced shaped / -inch rigid furring channels
5
8
8
12" o.c. applied at right angles to framing
members over third layer with two 2 / "
3
8
Type S-12 screws at each framing
5
member. Face layer / " Type X gypsum
8
board applied at right angles to furring
1
channels with 1 / " Type S screws
8
spaced 12" o.c.
(continued)
180 2018 INTERNATIONAL BUILDING CODE ®
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