The minimum concrete cover for slabs usually ranges between 20 mm and 30 mm, depending on exposure class. Eurocode allows 20 mm for internal dry environments (XC1), while 30 mm or more is required for external or aggressive exposures like XC3–XC4 or XD classes. According to ACI 318, 20 mm (3/4") is used for interior concrete, and 40 mm (1.5") for concrete exposed to weather or ground. To maintain correct cover, use non-corrosive plastic spacers placed at regular intervals, typically around 1.0 m. These support the reinforcement during casting and curing. Steel spacers are not recommended due to corrosion risks that can reduce durability.
Minimum Concrete Cover Standards – PDF Guide
This downloadable PDF contains minimum concrete cover standards for reinforced concrete elements, based on ACI 318 Table 20.6.1.3.1 and Eurocode 2 Table 4.4N. It provides essential cover requirements by element type, exposure class, and casting face.
What’s Included
- Cover requirements for beams, slabs, columns, and footings
- Different exposure scenarios (interior, exterior, contact with soil)
- Illustrated sections with labeled cover zones
- Quick-reference tables for both ACI and Eurocode users
This PDF is ideal for engineers, drafters, and detailers needing a fast and accurate reference during design and documentation.
Browse more resources in our Reinforcement Standards.
