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# How to calculate the cement, sand quantity for plastering

In this construction video tutorial provides some step-by-step guidelines to how to calculate the cement sand quantity for plastering.

Let us suppose,

Mortar ratio = 1:6 where 1 is cement and 6 part is sand.

Plaster thickness = 12 mm = 0.012 m

Cement density = 1440 kg/m^{3}

1 m3 = 35.3147 ft3

Suggested Plaster Thickness

12 mm for internal walls or brick wall plain surface

15 mm for 4” or 9” brick wall rough surface

20 mm for two plaster layers normally utilized for external walls

Mortar Wet volume = 1 x 1 x 0.012 = 0.012 m^{3}

Mortar Dry volume = 0.012 x 1.30 = 0.0156 m^{3}

Mortar Dry volume (sand + cement) = 30 – 35 % greater than wet volume = wet volume x 1.30

Concrete Dry volume (aggregate + sand + cement) = wet volume x 1.54

As we know that mortar ratio = 1:6, from which 1 + 6 = 7 = sum of ratio

Amount of cement in plaster = 1/7 x 0.0156 x 1440 = 3.21 kg

Also in bags = 3.21/50 = 0.064 bag = approximately 1 bag

Amount of sand in plaster = 6/7 x 0.0156 = 0.0133 m^{3}

Sand quantity in cubic feet = 0.0133 x 35.3147 = 0.47 ft^{3}

For more information, go through the following tutorial.

Lecturer: TECH@7K