# Quantity of Cement, Sand & Water required for Plastering:-

Plastering refers to protecting a wall or ceiling by laying a plaster (Cement plaster). Plastering is done to remove surface imperfections caused by **brickwork** and to keep the surface smooth for painting.

There are many different types of plastering materials out of them, cement plaster is extensively used. Some other types of plastering materials include lime plaster, clay plaster, etc.

## How to select the right plastering material for your house?

In any type of plastering two major factors are considered they are Surface Protection and the cost of material. If the quality of plastering is increased and taken higher, then the cost is affected. If price is considered and Quality of plaster are taken lesser importance then the surface protection is compromised.

- Plastering material should be cheap and economical.
- It should be durable enough to sustain any climatic changes in the entire life span of structure.
- Plastering material should have excellent workability which can be applied during any weather conditions.

Let us calculate the quantity raw materials (Cement, Sand & water) required for cement plaster. Though the same process is applicable for any other types of plastering materials.

Contents

- Quantity of Cement, Sand & Water required for Plastering:-
- How to select the right plastering material for your house?
- Calculating the quantities of Cement & Sand required for plastering:
- Different ratios of Cement mortar used for plastering are tabulated below:
- Steps involved in calculation of plastering quantities:
- Step 1: Calculate the Area of Plastering
- Step 3: Finding the individual quantities of Cement and Sand.
- Step 4: Finding the quantity of water required for plastering:
- How many bags of cement are required for 1 square meter of plastering?
- Online Plastering Calculator:

## Calculating the quantities of Cement & Sand required for plastering:

General points to be remembered in Plastering work calculation

- The ratios mentioned in plastering are volumetric ratios of Cement & Sand (Ex. Cement:Sand = 1:5, 1 part of cement and 5 parts of sand in a mortar).
- The overall thickness of plastering should be minimum 20mm including two coats.
- Cement has a dry density volume of 1440Kg/m
^{3} - Each bag of cement weighs = 50 Kgs or 110 lbs
- The Volume of each cement bag = 50Kgs/1440 =
**0.0348 m**.^{3} - The dry density of sand = 1600Kgs/m
^{3} - The plastering is done in two layers (two coats): The
**first coat**of plastering is laid with the thickness of minimum 12mm (usually ranges between 12-15mm) and this coat is called as a**Rough coat**or**Primary coat**. - The second coat should be laid with the thickness of 8mm and this is called as a
**Finish coat**or**Secondary coat**of plastering.

**Total Plastering = First coat + Second Coat**

### Different ratios of Cement mortar used for plastering are tabulated below:

Mix Ratio | Areas of usage |
---|---|

1:6 & 1:5 | This ratio is usually used for Internal plastering of bricks |

1:4 | Used for Ceiling and external walls |

1:3 | As its a rich mortar mix and it is used where external walls are prone to severe climatic conditions. It is also used for repair works. |

### Steps involved in calculation of plastering quantities:

- Find the total area of wall to be plastered in Sqm (m
^{2}). - Consider the ratio and thickness of plastering
- Calculate the Total Volume of Plastering
- Find out the Volume of Cement and Sand individually for both the coats
- Calculate the total volume of cement & Sand required for plastering

Now coming to the calculation part,

We are considering the below values for calculation purpose:

- Wall width and height is 10m and 10m.
- Ratio of First coat of plastering (Cement:Sand = 1:5) with the thickness of 12mm.
- the ratio of secondary coat of plastering (Cement:Sand = 1:3) with the thickness of 8mm.

**Step 1: Calculate the Area of Plastering**

Area = width x height = 10 x 10 = 100m^{2}

**Step 2: Find the Volume of Plastering **

Volume of First Coat = Area of Plastering x Thickness of Plastering

= 100m^{2} x 12mm (Convert mm to m)

= 100×0.012 = 1.2m^{3}

Hence, Volume of First Coat of Plastering = 1.2m^{3}

The volume of Second Coat = Area of Plastering x Thickness of Plastering

= 100m^{2} x 8mm (Convert mm to m)

= 100×0.008 = 0.8m^{3}

Therefore Volume of Second coat of plastering = 0.8m^{3}

**Step 3: Finding the individual quantities of Cement and Sand.**

First coat ratio = 1:5 (1 part of Cement and 5 parts of Sand)

Total parts = 1+5 = 6

**Quantity of Cement requir****ed for First coat** =

(Total Volume of first coat plastering x No. of Parts of cement) **÷ **Total Parts

= 1.2 x 1/6 = 0.2m^{3}

**Quantity of Sand required for First coat** =

(Total Volume of first coat plastering x No. of parts of sand) ÷ Total Parts

= 0.8 x 5/ 6 = 1.0m^{3}

**Similarly for Second coat,**

Second coat ratio = 1:3 (1 part of cement and 3 parts of sand)

Total parts = 1+3 =4

**Quantity of Cement required for Second coat**

= (Total Volume of second coat plastering x No. of Parts of cement) **÷ **Total Parts

= 0.8 x 1/4 = 0.2m^{3}

**Quantity of Sand required for Second coat **

= (Total Volume of second coat plastering x No. of parts of sand)÷ Total Parts

= 0.8 x 3/4 = 0.6m^{3}

#### Step 4: Finding the quantity of water required for plastering:

Amount of water to be added in mix depends upon the moisture content present in cement, sand & atmosphere.

Quantity of water = 20% of total dry material (Cement+Sand)

= 20% of (574+2560) = 0.2 x 3134 = 627 litres.

As mentioned above volume of 1 bag of cement (50kgs) = 0.0348m^{3}

For 0.4m^{3} = 0.4 x 50 / 0.0348 = 574Kgs = **11.4bags**

Similarly, for Sand 1m^{3} = 1600Kgs.

1.6 m^{3} = 1.6 x 1600 = 2560Kgs = **2.5tonnes**

Quantity of Water required = **627litres. **

### How many bags of cement are required for 1 square meter of plastering?

If the above mentioned values are considered for this then (Rough estimate)

From above, 100m^{2}= 574 Kgs of cement

1m^{2} = 574/100 = 5.7Kgs

**Summary: **

**Quantity of Cement, Sand & Water required for Plastering. For 100m ^{2} of Wall, if first & second coat of cement mortar ratio 1:5 & 1:3 laid then**

The Quantity of cement required = 574Kgs

Calculated Quantity of Sand (Fine aggregate) required = 2560Kgs

Quantity of Water required = 627 litres.

## Online Plastering Calculator:

**Related Articles :**

**Quantity of Cement, Sand, Aggregate and water required for different grades of concrete**

Great article

The blog is very sorted, as we all know that the if we want good results of plastering then the material used in the mixture, should be accurate and of good quality. Excellent guidelines have provided by this blog, quantity and quality both works for the good results. Quantity of cement mortar is required for rate of analyses of brickwork and plaster or estimation of masonry work for a building or structure.

HI.. you are really giving good info’s.. which everybody can understand easily and that too without doing 4 years civil engg…

keep it up ADMIN

All the best..

Prakash – 9842101030- Coimbatore