Specifications for covers and reinforcement in column
For a longitudinal reinforcing bar in a column nominal cover shall in any case not be less than 40 mm, or less than the diameter of such bar. In the case of columns of minimum dimension of 200 mm or under, whose reinforcing bars do not exceed 12 mm, a nominal cover of 25 mm may be used. For footings minimum cover shall be 50 mm.
Nominal Cover in mm to meet durability requirements based on exposure
Mild 20, Moderate 30, Severe 45, Very severe 50, Extreme 75
Nominal cover to meet specified period of fire resistance for all fire rating 0.5 to 4 hours is 40 mm for columns only
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