Concrete Cover Requirements: cast-against-earth to slab-wall-joist-not-exposed-small
Minimum concrete cover requirements per ACI 318-19 Table 20.6.1 — by member type, exposure category, and bar size for cast-in-place (non-prestressed and prestressed) and precast concrete
| member type | bar size max (dimensionless) | bar size min (dimensionless) | cover in (in) | cover mm (mm) | exposure category | notes |
|---|---|---|---|---|---|---|
| cast-against-earth | 18 | 3 | 3 | 76 | cast-against-earth | All bars cast against and permanently exposed to earth |
| exposed-to-weather-large | 18 | 6 | 2 | 51 | exposed-to-weather | #6 through #18 bars exposed to weather or earth |
| exposed-to-weather-small | 5 | 3 | 1.5 | 38 | exposed-to-weather | #5 and smaller bars exposed to weather or earth |
| slab-wall-joist-not-exposed-large | 18 | 14 | 1.5 | 38 | not-exposed | Slabs walls and joists not exposed — #14 and #18 bars |
| slab-wall-joist-not-exposed-small | 11 | 3 | 0.75 | 19 | not-exposed | Slabs walls and joists not exposed — #11 and smaller |
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