Roofing consisting of 5cm thick precast cement concrete 1:2:4 tiles laid in position with cement sand mortar 1:3 over RCC battens 0.6 metre apart excluding cost of RCC battens but including 4 cm thick screed of cement concrete 1:4:8 over tiles 2 coats of bitumen @ 2.34 kg per sqm 25 mm mud plaster. 7.5cm mud, another layer of 25mm mud plaster filling space between battens over beams with cement concrete (1:3:6) blocks in cement mortar 1:3 and cement pointing 1:2 on the underside of tiles.