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FIRE AND SMOKE PROTECTION FEATURES
INSIDE WYTHE
INSIDE WYTHE
CARBONATE
SILICEOUS
THICKNESS OF OUTSIDE WYTHE OF SAND-LIGHTWEIGHT CONCRETE, INCHES 5 4 3 2 1 0 1 THICKNESS OF INSIDE WYTHE, INCHES 5
5
4
4hr.
4hr.
3
3hr.
3hr.
2hr.
2hr.
2
1hr.
1hr.
1
0
4
5
4
2
3
1
3
2
THICKNESS OF OUTSIDE WYTHE OF CARBONATE OR SILICEOUS AGGREGATE CONCRETE, INCHES 5 4 3 2 1 OUTSIDE WYTHE 5 4 3 2 1 OUTSIDE WYTHE
SILICEOUS
CARBONATE
4hr.
4hr.
3hr.
3hr.
2hr.
2hr.
1hr.
1hr.
0
0
2
1
5
4
4
3
3
5
1
2
THICKNESS OF INSIDE WYTHE OF SAND-LIGHTWEIGHT CONCRETE, INCHES
For SI: 1 inch = 25.4 mm.
FIGURE 722.2.1.2
FIRE-RESISTANCE RATINGS OF TWO-WYTHE CONCRETE WALLS
TABLE 722.2.1.2(1)
VALUES OF R n 0.59 FOR USE IN EQUATION 7-4
THICKNESS OF MATERIAL (inches)
TYPE OF MATERIAL 1 1 1 1 1 1
1 / 2 2 2 / 2 3 3 / 2 4 4 / 2 5 5 / 2 6 6 / 2 7
Siliceous aggregate concrete 5.3 6.5 8.1 9.5 11.3 13.0 14.9 16.9 18.8 20.7 22.8 25.1
Carbonate aggregate concrete 5.5 7.1 8.9 10.4 12.0 14.0 16.2 18.1 20.3 21.9 24.7 27.2 c
Sand-lightweight concrete 6.5 8.2 10.5 12.8 15.5 18.1 20.7 23.3 26.0 c Note c Note c Note c
Lightweight concrete 6.6 8.8 11.2 13.7 16.5 19.1 21.9 24.7 27.8 c Note c Note c Note c
Insulating concrete a 9.3 13.3 16.6 18.3 23.1 26.5 c Note c Note c Note c Note c Note c Note c
Airspace b — — — — — — — — — — — —
3
For SI: 1 inch = 25.4 mm, 1 pound per cubic foot = 16.02 kg/m .
a. Dry unit weight of 35 pcf or less and consisting of cellular, perlite or vermiculite concrete.
1
1
1
1
b. The R 0.59 value for one / " to 3 / " airspace is 3.3. The R 0.59 value for two / " to 3 / " airspaces is 6.7.
n 2 2 n 2 2
c. The fire-resistance rating for this thickness exceeds 4 hours.
TABLE 722.2.1.2(2)
FIRE-RESISTANCE RATINGS BASED ON R 0.59
R , MINUTES R 0.59
a
60 11.2
120 16.8
180 21.4
240 25.3
a. Based on Equation 7-4.
2018 INTERNATIONAL BUILDING CODE ® 183
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