Civil Engineering Reference
In-Depth Information
will generally equal or exceed the minimum cover requirements shown in the following tables, but there are a
few exceptions at the higher fire ratings and these should be noted.
The minimum thickness of concrete cover to the positive moment reinforcement is given in Table 10-3 for one-
way or two-way slabs with flat undersurfaces.
The minimum thickness of concrete cover to the positive moment reinforcement (bottom steel) in reinforced
concrete beams is shown in Table 10-4.
Table 10-3 Minimum Cover for Reinforced Concrete Floor or Roof Slabs, in.—(Reference 10.4)
Fire-Resistance Rating (hours)
Restrained
Unrestrained
Concrete Aggregate Type
1
1
1
/
2
2
3
4
1
1
1
/
2
2
3
4
Siliceous
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
1
1
1
/
4
1
5
/
8
Carbonate
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
1
1
/
4
1
1
/
4
Sand-lightweight or lightweight
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
3
/
4
1
1
/
4
1
1
/
4
Table 10-4 Minimum Cover to Main Reinforcing Bars in Reinforced Concrete Beams, in.
(Applicable to All Types of Structural Concrete)
The minimum cover to main longitudinal reinforcement in columns is shown in Table 10-6.
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