The lightest masonry material available in today's market is AAC blocks (Autoclaved Aerated Concrete Blocks) whose density is about 1/3rd times of the clay bricks and fly ash bricks and about 1/5th times of the Concrete because of its foam-like structure made up of 80% of air voids while they are being used since the 1920s in most of the part in Europe still many are not accepting them in countries like India and America. Due to its lightweight and great thermal resistance, it is gaining popularity all across the world but not only it is gaining popularity because of its engineering properties but also because it is an eco-friendly product which is why even government and other organizations are promoting its usage. But this lightweight eco-friendly product is also economic as even after the initial costing is higher than clay bricks but its light weight causes the reduction in dead weight around 1/3rd times hence the total project cost decreases by 15-30%.