Concrete Cover Requirements: beam-column-not-exposed to precast-wall-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 |
|---|---|---|---|---|---|---|
| beam-column-not-exposed | 18 | 3 | 1.5 | 38 | not-exposed | Beams and columns not exposed — primary reinforcement ties and stirrups |
| shell-folded-not-exposed-large | 18 | 6 | 0.75 | 19 | not-exposed | Shells and folded plates not exposed — #6 and larger |
| shell-folded-not-exposed-small | 5 | 3 | 0.5 | 13 | not-exposed | Shells and folded plates not exposed — #5 and smaller |
| precast-wall-exposed-large | 18 | 14 | 1.5 | 38 | exposed-to-weather | Precast wall panels exposed — #14 and #18; plant control |
| precast-wall-exposed-small | 11 | 3 | 0.75 | 19 | exposed-to-weather | Precast wall panels exposed — #11 and smaller; plant control |
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