Cement, Sand, Aggregate proportion during building construction. This is the standard requirements but may change based on the site condition. Structural engineer inputs are mandatory. SL Description Grade of Cement / Sand / Aggregate No Concrete (Proportion) 1. PCC Foundation M 10 1 : 3 : 6 / 1 : 4 : 8 2. Footing Concrete M 20 1 : 1.5 : 3 3. Plinth Concrete M 20 1 : 1.5 : 3 4. Columns Concrete M 25 1 : 1 : 2 5. Lintel / chajja M 15 1 : 2 : 4 6. RCC Slab M 20 1 : 1.5 : 3 7. Stone Masonry 1 : 6 8. Bricks Masonry