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Answered by Pushpa on Tue Nov 06, 2007 5:48 PM

The following measures should be taken during construction to prevent the leakage from the roof. These preventive measures do not need any additional expenditure yet they are very effective in making a roof leak-proof.

You should follow the steps below after the RCC slab on the roof has been laid.

1.         Clean RCC slab with wire brush and broom after it dries.

2.         Lay cement concrete gola along the junction of wall and RCC slab.

3.         Keep the height of rainy water pipe 1 inch lower than the top of the tile tracing level to make proper slope for disposal of water.

4.         Apply two coats of bitumen on roof slabs including the walls up to 6 inches height.

5.         Apply polythene or tar felt sheet on bitumen surface.

6.         Lay one inch thick mud plaster mixed with "bhusa" (Wheat chopper) on the polythene surface.

7.         Put the soil on mud plaster giving necessary slope not less 1:40. The soil should be watered and rammed.

8.         Lay brick tiles with mud mortar on the roof providing required slope.

9.         Finish the mouth of rainy water pipe smoothly leaving no joints between the pipe and tiles.

10.        Grout the joints of brick tiles with cement mortar 1:3.

11.        Do cement pointing on the joints of tiles. Proper curing for at least seven days should be done.

12.        Provide necessary iron grating on the top of rainy water pipes to avoid any blockage in rainy water pipes.

13.        Discharge rainy water through the proper shoe of rainy water pipes for plinth protection.

14.        Finish all the joints properly and round.


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