Terracing consiting of machine made Hollow Clay ) Tiles 80mm thick (Smooth surfa IS: 3951(Part-l)-2009 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 on top of R.C.C. slab including grouting with cement sand mortar 1:4 having 10mm wide joints spacing on all sides of tiles and top surface to be left clean complete as per specification (laying shall be done as per PWD specifications).