The Minimum Cover for an RCC column should be:

1. Greater of 40 mm or diameter
2. Greater of 30 mm or diameter
3. Greater of 50 mm or diameter
4. Greater of 25 mm or diameter

The minimum cover for an RCC column should be greater of 40 mm or diameter. The fire resistance and exposure circumstances determine the minimal clear cover.

• The design depth of concrete cover to all-steel reinforcements is known as the nominal cover to meet fire resistance.
• It must be at least as big as the bar’s diameter.
• The table below provides the minimum values of the nominal cover of normal-weight aggregate concrete that must be provided to all reinforcing to achieve the required period of fire resistance.