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IS : 2115 - 1980 : Protection Against Water Penetration.
IS : 2115 - 1980 : Protection Against Water Penetration.

Mud PHUSKA layer by itself may not be sufficiently waterproof for the roof and it may be necessary to provide beneath it a waterproofing layer or membrane to be effective in this respect. Care shall also be exercised while doing the roof finish work to compact the mud PHUSKA layer to the maximum density

The slope of the terrace shall be such as to drain off promptly all rain-water falling on the roof surface well before the water begins to seep through cracks, if any, into the mud PHUSKA layer. The slope shall not be less than 1 in 40. If it is not possible to give all the slope by the mud PHUSKA layer, part of the slope required for roof drainage may be given in the sub-floor itself.

Rain-water pipes to be provided for roof drainage shall be determined in accordance with the intensity and duration of the rainfall in the area. The cross-sectional area of flow of the rain-water pipe shall be not less than l/5000 of the roof area drained, and the pipe shall in no case be less than 100 mm diameter.

For more detail on mud refer following thread of the Forum
Cracking occurs when an external wall is repeatedly wet and dried in an exposed environment. 
If the wall cannot be protected against rain or other water sources then a penetrating water repellent sealer can be applied over the surface. Sealer will stop the wall from absorbing water; however it will not impede its ability to breathe. The breathability of earth walls is essential, or the risk of deterioration (due to the accumulation of trapped moisture within) is too great. Any surface application of a water repellent sealer or dust binder must not interfere with the permeability of the wall. 

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