Wooden joists are placed on R S J with a furring piece in-between. The furring piece height at the centers is so adjusted that the required slope of the roof is obtained.
A course of specially prepared bricks of size 15 cm x 5 cm x 12 mm is placed on edge in lime mortar (1: 1.5) laid diagonally across the joints.
After the brick course is set, a 10 cm thick layer of brick-bat concrete is laid; consisting of 3 parts of brick bats, 1 part of gravel and sand and 50 percent of lime mortar by volume. The concrete is well-rammed for 3 days, so that the thickness reduces to 7.5 cm, by wooden hand beaters. The surface is curved for 3 days, by sprinking lime water.
When the brick-bat concrete has set, three courses of Madras flat tiles (15cm x 10cm x 12mm) are laid in lime mortar (1:1 1/2 ), making a total thickness of 50 mm. the vertical joints of the tiles in successive layers should be broken. The joints of tiles in top layer are left open to provide key for top plaster. Alternatively, china mosaic tiles may be used.
Finally the top surface is plastered with three coats of lime mortar. The surface is rubbed and polished.
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