Terracing consiting of tiles 22.86×11.43×3.83cm laid over 25 mm mud plaster 7.5 cm mud filling on another layer of 25mm mud plaster including two coats of bitumen laid hot at 1.65 Kg. /Sqm top ofR.C.C. slab including grouting with cement sand mortar 1:4 and top surface to be left clean after wire brushing