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Question
Lime terracing is provided with how much slope to drain off rainwater from roof to gutters?
A.
1:60 to 1:100
B.
1:10 to 1:20
C.
1:6 to 1:10
D.
1:20 to 1:60
Answer ( Option A)

1:60 to 1:100

Solution

R.C.C floor
• These R.C.C or R.B. flat roofs are constructed in a similar way as R.C.C or R.B. floors except that they are required to be protected against weather elements, i.e, rain, snow, and heat.
• A protective covering, consisting of a 10 cm thick layer of lime concrete terracing with some waterproofing compound is provided over the R.C.C or R.B. slab. This layer makes the roof leak-proof.
• The layer of lime concrete is thoroughly beaten by hand beaters to make it hard, impervious and compact.
• At the junction of the wall, the lime concrete terracing is taken inside the wall for a depth of 10-15 cm and the corner is given a round smooth finish. This is done to prevent the accumulation and leakage of water at junctions.
• The lime terracing is provided with a little slope, usually 1 in 60 to 1 in 100, to drain off the rainwater rapidly and easily.

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