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FIRE AND SMOKE PROTECTION FEATURES

722.2.2.3 Multicourse roofs. The fire-resistance rat- topping not less than 1 inch (25 mm) thick is used.
ings of roofs that consist of a base slab of concrete with Where concrete topping is not used, joints must be
a topping (overlay) of an insulating concrete or with an grouted to a depth of not less than one-third the slab
insulating board and built-up roofing shall comply with thickness at the joint, but not less than 1 inch (25 mm),
Figures 722.2.2.3(1) and 722.2.2.3(2). or the joints must be made fire resistant by other
722.2.2.3.1 Heat transfer. For the transfer of heat, approved methods.
three-ply built-up roofing contributes 10 minutes to 722.2.3 Concrete cover over reinforcement. The mini-
the fire-resistance rating. The fire-resistance rating mum thickness of concrete cover over reinforcement in
for concrete assemblies such as those shown in Fig- concrete slabs, reinforced beams and prestressed beams
ure 722.2.2.3(1) shall be increased by 10 minutes. shall comply with this section.
This increase is not applicable to those shown in 722.2.3.1 Slab cover. The minimum thickness of con-
Figure 722.2.2.3(2). crete cover to the positive moment reinforcement shall
722.2.2.4 Joints in precast slabs. Joints between adja- comply with Table 722.2.3(1) for reinforced concrete
cent precast concrete slabs need not be considered in and Table 722.2.3(2) for prestressed concrete. These
calculating the slab thickness provided that a concrete tables are applicable for solid or hollow-core one-way
or two-way slabs with flat undersurfaces. These tables

STANDARD 3-PLY
CELLULAR CONCRETE
BUILT-UP ROOFING
CONCRETE MINERAL BOARD
THICKNESS OF CELLULAR CONCRETE OVERLAY, INCHES 2 1 1hr. 2hr. 2 1 1hr. 3hr. 2 1 1hr. 2hr. 3 CARBONATE BASE 3 SILICEOUS BASE SAND-LIGHTWEIGHT BASE
CONCRETE
3
4hr.
4hr.
4hr.
(a) 3 CARBONATE BASE 3 SILICEOUS BASE SAND-LIGHTWEIGHT BASE
3hr.
3hr.
2hr.
3
4
0
0
4
2
2
THICKNESS OF CONCRETE BASE SLAB, INCHES
3hr.
PERLITE CONCRETE 0 2 4 (d) THICKNESS OF MINERAL BOARD, INCHES 2 1 1hr. 2hr. 3hr. 4hr. 2 1 1hr. 2hr. 4hr. 2 1 1hr. 2hr. 3hr. 4hr.
0
0
CONCRETE SAND-LIGHTWEIGHT BASE 0 1 2 3 THICKNESS OF CONCRETE BASE SLAB, INCHES 3 4
2
3
4
4
1
2
1
THICKNESS OF PERLITE CONCRETE OVERLAY, INCHES 2 1 1hr. 2hr. 2 1 1hr. 2 1 1hr. 2hr. STANDARD 3-PLY
CARBONATE BASE
SILICEOUS BASE
4hr.
4hr.
(b) 4 3 3hr. 4 3 3hr. 4 3 4hr.
3hr.
2hr.
0
4
4
0
0
2
2
4
2
THICKNESS OF CONCRETE BASE SLAB, INCHES
GLASS FIBER BOARD
CONCRETE BUILT-UP ROOFING
VERMICULITE CONCRETE
CONCRETE 4 SAND-LIGHTWEIGHT BASE CARBONATE BASE SILICEOUS BASE SAND-LIGHTWEIGHT BASE
THICKNESS OF VERMICULITE CONCRETE OVERLAY, INCHES 2 1 0 1hr. 2hr. 4 2 1 0 1hr. 2hr. 4 1 0 1hr. 2 3hr. 4 (e) 1 0 1 1hr. 2hr. 3 5 1 0 1 1hr. 2hr. 3 5 1 0 1 1hr. 2hr. 3 5
SILICEOUS BASE
CARBONATE BASE
4
4hr.
4hr.
(c) 4 3 3hr. 3 3hr. 3 2 4hr. THICKNESS OF GLASS FIBER BOARD, INCHES 3 2 3hr. 4hr. 3 2 3hr. 4hr. 3 2 3hr. 4hr.
2hr.
2
2
THICKNESS OF CONCRETE BASE SLAB, INCHES
THICKNESS OF CONCRETE BASE SLAB, INCHES
For SI: 1 inch = 25.4 mm. For SI: 1 inch = 25.4 mm.
FIGURE 722.2.2.3(1) FIGURE 722.2.2.3(2)
FIRE-RESISTANCE RATINGS FOR FIRE-RESISTANCE RATINGS
CONCRETE ROOF ASSEMBLIES FOR CONCRETE ROOF ASSEMBLIES
186 2018 INTERNATIONAL BUILDING CODE ®
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