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Q: According to IS 456 : 2000, what should be the nominal cover to reinforcement for footings?
  • A. 45 mm
  • B. 20 mm
  • C. 50 mm
  • D. 30 mm
Correct Answer: Option C - The Indian Standard Codes IS : 456–2000 (clause 26.4.2.2) provides for separate nominal cover requirement to meet durability and fire resistance requirements. For footings of columns where the footing slab is in contact with soil, the minimum cover shall be 50 mm. • The distance from extreme fiber of shear stirrup to bottom tension fiber is known as cover/clear cover. Structural Elements (mild exposure) Minimum Cover • Slab 20 mm • Beams 25 mm • Columns 40 mm • Footings 50 mm
C. The Indian Standard Codes IS : 456–2000 (clause 26.4.2.2) provides for separate nominal cover requirement to meet durability and fire resistance requirements. For footings of columns where the footing slab is in contact with soil, the minimum cover shall be 50 mm. • The distance from extreme fiber of shear stirrup to bottom tension fiber is known as cover/clear cover. Structural Elements (mild exposure) Minimum Cover • Slab 20 mm • Beams 25 mm • Columns 40 mm • Footings 50 mm

Explanations:

The Indian Standard Codes IS : 456–2000 (clause 26.4.2.2) provides for separate nominal cover requirement to meet durability and fire resistance requirements. For footings of columns where the footing slab is in contact with soil, the minimum cover shall be 50 mm. • The distance from extreme fiber of shear stirrup to bottom tension fiber is known as cover/clear cover. Structural Elements (mild exposure) Minimum Cover • Slab 20 mm • Beams 25 mm • Columns 40 mm • Footings 50 mm