How To Calculate Cement, Sand Quantity For Plastering?

How To Calculate Cement, Sand Quantity For Plastering?

Plastering is done to protect the surface of wall. Learn how to calculate cement and sand quantity for plastering in this article.

Following points should be remembered while calculating the quantity of cement, sand for plastering work.

1. For wall plastering, Cement : Sand = 1 : 6

2. For ceiling plastering, Cement : Sand =  1 : 4

3. Thickness of the plaster should be between 12-15 mm. If an additional coat is required, then do not do it in one go.

4. Use good quality cement & Sand.

5. Use a measuring box (not a head pan) for the site mix.

We will calculate cement and sand for 100 m2 plastering area in 1:6 ratio and thickness of 12 mm.

Cement Mortar Required:

Plastering thickness = 12 mm

= 12/1000 = 0.012m

Volume of cement mortar required = ( Plastering Area x thickness )

= 100 m2 x 0.012m = 1.2 m3

(This is wet volume of cement mortar (after mixing water), but we need dry volume. To get dry volume, consider 35% bulking of sand and 20% wastage

= 1.2 m3 x (1+0.2+0.35) (Rather than 35% sand bulkage and 20% wastage, you can add 1.54 as constant)

= 1.86 m3

Cement : Sand = 1 : 6

Sum of ratio = (1+6) = 7

Cement Required

= 1.86 x 1/7 = 0.265 m3

= 0.265/0.0347 (0.0347 m3 = 1 bag = 50 kg cement)

= 7.66 bags = 8 bags

Sand required:

1.86 x 6/7

= 1.59 m3

Here we have calculated in Sq.m but you can also use Sq. ft.

Here we have calculated in Sq.m, but you can also calculate it in Sq.ft.