RCC and RB slab roof excluding steel CUM Per CUM 2. Lean concrete roof over and inclusive of tiles or brick or stone slab etc. thickness specified SQM Per SQM 3. Centering and shuttering formwork SQM Per SQM 4. AC sheet roofing SQM Per SQM 9 Plastering points and finishing 1. Plastering cement or lime mortar thickness and .