Supply and fixing of Precoated Galvanized Iron profile sheets & Roof Air Ventilation after dismantling existing sheets/shutters, including necessary structural work and painting of the following godown of Materials Department inside Industrial area at Duliajan: 1. Roof Work at Godown No. 4 (Office). 2. Wall and Roof Work at Chemical Godown. 3. Wall and Roof Work at PPE Godown.