For effective drainage, the finished surface of flat roof should have a minimum slope of:

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OSSC JE (Civil) 2014 Official Paper
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  1. 1 in 5
  2. 1 in 10
  3. 1 in 15
  4. 1 in 20
  5. 1 in 40

Answer (Detailed Solution Below)

Option 4 : 1 in 20
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Explanation:

Flate roof:

  • The roof is the topmost part of any building or structure that protects the interior from heat, rain, snow, etc.
  • Pitch is the slope of the roof and the type of roof which has a pitch of approximately 10 degrees or below is called a flat roof.

Flat roof slope:

  • It is absolutely essential that roofs are provided with adequate slopes to ensure effective drainage.
  • The slope of the roof should be such that the water gets drained off quickly by achieving adequate velocity under influence of gravity.
  • For efficient drainage of rainwater from the finished surface flat roof the slope should not be less than 1 in 20.
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