Ratio of Cement and Sand for ‘Plastering’

Plastering not only makes the surfaces smooth but creates a good finishing to the walls, ceiling and roofs also.

The ratio of cement and sand for plastering is given below. 

• 6 MM thickness of cement plaster and cement mortar 1:3 or 1:4 is recommended for cement plastering on RCC surfaces, on the RCC walls, Fascia etc. or as directed by the Engineer,
• 6 MM to 10 MM thickness of cement plaster and cement mortar in 1:3 or 1:4 ratios is recommended for underside of RCC slabs.
• 12 MM thick cement mortar in 1:4 ratios is recommended on the walls where smooth side exists.
• Either 9 or 4.5 MM thick and 15 MM thick cement plaster in 1:4 ratios is recommended on the rough side of the walls.
• 20 MM thick cement mortar in 1:3 with two coats is recommended in case of vertical Damp Proof Course (DPC).
• 6 MM thick cement mortar in 1:3 with a coat of whitewashing is recommended in case of bearing plaster on the walls under the slab.
• 15 MM thick cement mortar in 1:3 is used with 3 MM thick cement rendering on plaster in the case of Dado.