# How To Calculate Cement Sand for Plastering

In this article, we will discuss how to calculate cement sand for plastering.

### 1. Introduction

Plastering is the process of covering 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.

### 2. Ratio For Plastering

For cement mortar ratio for wall, plastering is 1:6

For cement mortar ratio for ceiling, plastering is 1:4

The plastering shouldn’t be more than 12-15mm. Use good quality cement and sand for plastering.

### 3. How To Calculate Cement Sand for Plastering?

Let us take an area of 100 sqm.

The plastering thickness is about 12mm = 12/1000 = 0.012m

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

= 100 mx 0.012m = 1.2 m3

Take 35% Sand Bulkage and 20% wastage

Volume (with bulkage) = 1.2 mx (1+0.2+0.35)

= 1.86 m3

Cement : Sand (Ratio) = 1 : 6 ( Total = 1+ 6 = 7 Parts )

Cement required (1 Part) = 1.86 x 1/7

= 0.265 m/0.0347

= 7.66 bags (Approx – 8 Bags)

Sand required (6 Part) = 1.86 x 6/7

= 1.59 m3

### 4. Objectives of Plastering

a. To provide a smooth and finished surface.

b. To protect the surfaces against atmospheric effects.

c. To resist chemical actions.

d. To cover defects in the structure.

e. To give a decorative appearance.

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