Clear cover to main reinforcement

Question

Accepted Answer

Clear cover to main reinforcement is the distance between the outer surface of concrete and the nearest surface of the reinforcement.

Clear cover is important to protect the reinforcement from corrosion and fire damage.
It is specified in the design and varies depending on the type of structure and environmental conditions.
For example, in a residential building, the clear cover may be around 25mm to 50mm.
In a marine structure, the clear cover may need to be increased to 75mm or more to withstand harsh conditions.
Clear cover can be achieved by using concrete spacers or chairs during construction.

Accepted Answer

Footing:- 50 to 75 mm
Strab beam:- 50 mm
Raft foundation:- 75 mm
Column:-40 mm
Grade slab:- 20 mm
Flat slab:- 20 mm
Shear wall:- 25 mm
Stair case:- 15mm
Water retaining structure:-20 to 30 mm
Retaining wall:- 20 to 25mm on earth 
Raft foundation top:- 50 mm

Clear cover to main reinforcement

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