Concrete Cover Requirements: precast-other-exposed-large to precast-slab-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 |
|---|---|---|---|---|---|---|
| precast-other-exposed-large | 18 | 14 | 2 | 51 | exposed-to-weather | Other precast members exposed — #14 and #18 |
| precast-other-exposed-medium | 11 | 6 | 1.5 | 38 | exposed-to-weather | Other precast members exposed — #6 through #11 |
| precast-other-exposed-small | 5 | 3 | 1.25 | 32 | exposed-to-weather | Other precast members exposed — #5 and smaller |
| precast-slab-not-exposed-large | 18 | 14 | 1.25 | 32 | not-exposed | Precast slabs walls joists not exposed — #14 and #18 |
| precast-slab-not-exposed-small | 11 | 3 | 0.625 | 16 | not-exposed | Precast slabs walls joists not exposed — #11 and smaller |
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