Concrete Cover Requirements: precast-beam-col-not-exposed-ties to prestressed-cast-in-place-not-exposed
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-beam-col-not-exposed-ties | 4 | 3 | 0.375 | 10 | not-exposed | Precast beams/columns not exposed — ties stirrups spirals |
| precast-shell-not-exposed-large | 18 | 6 | 0.625 | 16 | not-exposed | Precast shells/folded plates not exposed — #6 and larger |
| precast-shell-not-exposed-small | 5 | 3 | 0.375 | 10 | not-exposed | Precast shells/folded plates not exposed — #5 and smaller |
| prestressed-cast-in-place-exposed | 18 | 3 | 1.5 | 38 | exposed-to-weather | Cast-in-place prestressed — exposed to weather |
| prestressed-cast-in-place-not-exposed | 18 | 3 | 1 | 25 | not-exposed | Cast-in-place prestressed — not exposed (slabs/walls) |
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