# Plaster Calculator

Note: We have considered 33% extra for volume change and losses.

Plastering covers the rough surfaces of walls, columns, ceilings, and other building components with a thin coat of plaster to make the surface smooth and durable.

Plastering on the externally exposed surface is called rendering. Generally, cement plaster and lime plaster are used for plastering work.

 LOCATION THICKNESS RATIO External Wall 20mm 1:6 Internal Wall 15mm 1:4 Ceiling 12mm 1:3

### 1. Plaster Calculator Formula

Example:

Required Plastering Area = 10 x 10 = 100 m2

Plastering thickness = 12 mm

Required volume of Cement Mortar = Plastering area x Plastering thickness = 100 x 0.012 = 1.2 m3

Increase the volume by 33% to get a dry volume mix.

Dry Volume = 1.2 + 33% of 1.2 = 1.596 m3

Cement Mortar Ratio = 1:3 (1 Part Cement : 3 Part Sand)

So total part of mortar = 1+3 = 4

Therefore,

Required Volume of Cement = (1/4) x 1.596

= 0.399 m3

To convert into cement bags

= (0.399 x 1440)/50

= 11.49 Bags

[Unit weight of Cement = 1440 Kg/m3    1 bag cement = 50 Kg]

Required Sand Volume = 3/4 x 1.596

= 1.197 m3

### 2. Requirements for Good Plaster Material

The plaster material should fulfill the following requirements:

a. It should be hard and durable.

b. It should remain on the surface and protect from chemical attacks and weathering actions.

c. It should have good workability.

d. It should have high strength and durability.

e. It should be cheap and should be easily available.

f. It should protect from penetration of nature.

 Verified Article By Er. Madhu Krishna Poudel
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