This type of terracing is suitable where rainfall is less. It can be provided either on tiles (Punjab type terracing) or a wood boards (Maharashtra and Madhya Pradesh practice). In both the cases terracing is made with white earth mud containing large percentage of sodium salt.
The mud-terracing in Punjab is provided over roof which consists of 50mm x 50mm x 6mm T-sections spaced at 32cm center to center over Rolled Steel Joists well burnt tiles of size 30cm x 30cm x 5cm or 30cm x 15cm x 5cm are placed between the flanges of the T-sections; using lime mortar. Over the tiles, a 15 cm thick layer of stiff mud, white in colour and containing sodium salts, is spread and beaten with sticks till the surface becomes hard and better rebounds. The surface is then plastered with mud and cow-dung mix plaster. Finally the surface is finished with 1:4 cement cow-dung plasters.
In the Maharashtra and Madhya Pradesh practice, mud terracing is done on teak wood boards ( 4 to 5 cm thick ) nailed to the wooden joists. On the boards, a 2.5 cm thick layer of wood shaving is spread, over which bricks are laid on edge, in lime or mud mortar. On the bricks 8 to 10 cm thick layer of mud is spread and beaten hard. Finally, a 2.5 cm thick layer of white earth containing high percentage of sodium salts is applied. This top layer has to be renewed once in a year. Such roofs do not leak, provide insulation against heat and thus keep the building cool and comfortable.
Participants