Cement Required for Plastering

How Much Cement, Sand And Water Is Required For 12mm Thick Plastering?

Plastering is done on the walls to remove surface imperfections, maintain line level and alignment. In addition to that it also acts as a protective surface for external walls. Cement plaster, Gypsum plaster and Lime plaster are the commonly used plastering materials for house constructions. Cement plaster is made by mixing cement and sand in the proportions required. Cement plaster is applied to both interior and exterior walls to give them a smooth surface.

Recommended Cement Mortar Ratio For Plastering:

Mix Ratio of Mortar	General Usage Recommended
1:3	Very rich mortar mix. Not recommended for general usage at sites. Can act as a repair mortar with a waterproofing/bonding agent
1:4	For External Plaster and for ceiling plaster
1:5	Brickwork Mortar and for Internal plaster (If sand is not fine Fineness Modulas > 3)
1:6	For Internal Plaster (if fine sand is available)

How To Calculate Cement And Sand Required For Cement Plastering:

To arrive at the quantities of Cement, Sand and Water required for Plastering work, we need to understand on what parameters do these quantities depend.

1. Volume of Plaster required: Volume of Plaster can be determined by multiplying the area of plastering to be done and thickness of plaster (12 mm in this case)
2. Mix Ratio of Plaster: Mix ratio mean the ratio of Volume of Cement to the Sand used in the mixture. Plaster of mix ratio 1:4 mean that it contains one part of cement and 4 parts of sand by volume. Since the amount of cement and sand changes with the change in the mix ratio, it is one of the most important factors in determining the quantities.

Quantities Of Cement, Sand And Water In Various Mix Ratio Of Plaster:

Area (Sqm)	Plaster thickness (mm)	Mix Ratio of Mortar	Cement (in Kgs)	Sand (In cft)	Water (in Kgs)
10	12	1:3	49.37	3.77	44
10	12	1:4	39.29	3.99	44
10	12	1:5	32.54	4.14	44
10	12	1:6	27.80	4.24	44

Wastage of materials is not considered in the calculation. You can consider a wastage factor of 5% to the above calculation.