Flat roofs are provided with a weather-proof course to sustain the effects of atmospheric agencies. The construction of waterproof course consists of providing one course of surki-concrete and two courses of flat tiles. The surki concrete (broken brick aggregate and lime with no sand) in the mix ratio of 1: 2 : 5 is laid to a compacted thickness of 75 mm. The concrete layer is provided with a minimum slope of 1 in 50 slope directed towards the rain water drain pipes. After curing for 6 days, two courses of flat tiles (or one course of pressed tiles) are laid in a cement mortar of 1 : 3 with crude oil.
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