The nominal cover in IS 456 is defined as:
Choose the correct answer
Clear distance from bar surface to concrete surface
Distance from center of outermost bar to concrete surface
Clear cover + bar diameter/2
Cover required for durability, fire resistance, or minimum cover for bond, whichever is greatest
Correct Answer
D. Cover required for durability, fire resistance, or minimum cover for bond, whichever is greatest
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IS 456 Cl. 26.4: Nominal cover = the clear cover required for durability (per Table 16) or for fire resistance (per Table 16A), or a minimum of 20mm for bond, whichever is maximum. It is the distance from the surface of the bar/stirrup to the concrete surface.
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