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First assume the ratio of plaster is 1:4 (1 cement and 4 sand)

now we have to plaster the wall having area of 100 sft assume the thickness of plaster 0.5 inches.

first convert thickness in to feet so 0.5/12 = 0.0416

now to calculate the material use in cft so 100 sft x 0.0416 = 4.16 cft

so we required 4.16 cft material to complete the plaster multiply it by dry factor 1.5

4.16 x 1.5 = 6.24 cft

to calculate cement 6.24/(1+4) = 1.24 cft

1 cement bag volume 1.25 cft so calculate no of bags 1.24/1.25 = 1 bag

to calculate sand

(6.24/(1+4)) x 4 = 4.99 cft

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Q: How do you calculate required cement bag for 100sqft wall plastering soft?
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