This method of terracing is equally suitable to hot as well as arid regions, and is commonly used over R.C.C roofing. The work is carried out in the following steps.
The R.C.C slab is cleared off dust and loose material. A layer of hot bitumen is spread over it at the rate of 1.70 kg of bitumen per square metre of roof surface.
A layer of coarse sand is immediately spread over the hot coat of bitumen , at the rate of 0.6 m3 of sand per 100 m3 of roof surface.
Mud-phuska is prepared from puddle clay mixed with bhusa at the rate of about 8 kg of bhusa per m3 of clay. A 10 cm thick layer of this mud-phuska is applied over the sand- bitumen layer. Proper slope (usually 1 in 40) is given in mud-phuska layer. Alternatively , slope may be given in RCC slab itself.
The mud-phuska layer is consolidated properly. It is then plastered with 13 mm coat of mud-cow-dung mortar (3:1)
Tile bricks are laid flat on plastered surface. The joints are grouted is 1:3 cementmortar.
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