## Introduction of Cement Plastering:

Important Point

**Cement plastering**is the process in which the cement mortar is applied to the surface of the wall to protect it from the penetration of water and other aggressive environmental conditions.- In this article, we will see
**how to calculate the amount of cement & sand required for plastering and**how to calculate the**cement sand quantity for brickwork.** - The
**cement mortar ratio**which is generally used for the plastering depends upon the type of**plastering work.** - There are various types of cement
**mortar ratio**are used for different types of**cement plaster design.** - The
**plastering ratio**which is recommended for the plastering of the plane surface, the rough surface of the brick wall, and the rough surface of the concrete walls and ceilings are**1:6,****1:4**and**1:5,**and**1:3**are used respectively.

Also, Read: Requirements of Good Plastering

## How Many Cement Bags Per Square Metre for Plastering?

**Step 1: Volume of Plaster.**

Here we will calculate the **cement consumption in plaster **for a 1 **square metre area**.

Let us take the **plastering thickness **for the surface of the brickwork is 12mm in a ratio 1:6(cement : sand).

First upon we have to calculate the volume of the cement mortar which is required for the plastering work of** one square metre area.**

**Volume of Plaster = L x B x t**

Here,

**L** = Length of the plastering surface= **1 m**

**B**= breadth of the plastering surface=** 1 m**

**t** = thickness of the plaster= 12 mm = **0.012 m**

**Volume of Plaster**= 1 x 1 x 0.012

**Wet volume of Plaster = 0.012 m ^{3}**

**Step 2: Dry Volume of Plaster.**

Here we have to calculate the dry volume of the plaster in order to find the consumption of the cement for the plaster.

**Dry Volume of Plaster = 1.33. x wet volume of the plaster**

**Dry Volume of Plaster = 1.33 x 0.012**

**Dry Volume of Plaster = 0.01596 m ^{3}**

**Note: **The Dry volume of the plaster is calculated and used in the formula because the quantity of the cement we are calculating is in the dry state.

**Step 3: Volume of Cement in M**^{3}.

^{3}.

The** Cement calculation formula for plastering **are as follows.

**Volume of Cement = ( Ratio of cement/Sum of the ratio of cement and sand ) x Dry Volume of Plaster**

**Volume of Cement **= (1 / 7) x 0.01596

**Volume of Cement = 0.0028 m ^{3}**

**Step 4: Volume of Cement in Bags.**

Hence, the number of cement bags calculated are as follows.

**Number of Bags** = **Volume of Cement/Volume** of **One Bag of Cement**

**Number of Bags** = ( 0.0028/ 0.0347)

**Number of Bags = 0.08 bag**

We know that,

- The volume of
**one bag of cement**is**0.0347 m**^{3}

**Step 5: Volume of Cement in Kg.**

Calculating the cement consumption for the plastering work in kg.

**Volume of Cement in Kg. = Density of Cement x Volume of Cement **

**Volume of Cement in Kg. = **1440 x 0.0028

**Volume of Cement in Kg. = Density of Cement x Volume of Cement **

**Volume of Cement in Kg. = 4.032 Kg **

We know that,

- The density of cement is 1440 kg per m
^{3} - There are
**0.08 cement bag**is required for the plastering work of**one square metre**.

### How to Calculate the Cement Sand Quantity for Plastering?

The method of calculating the quantity of cement and sand which is required for the plastering work is as follows.

Also, Read: Difference Between Gypsum Plaster and Cement Plaster | What Is Gypsum Plaster | What Is Cement Plaster

## How to Calculate Plastering Quantity?

First upon calculating the total area where plaster has to be applied.

Then calculate the wet volume of that area where plaster is to be applied.

**Wet volume of plaster = Area of Plaster x Plastering Thickness**

We have to calculate the dry volumes of the plaster. The formula to calculate the Dry volume of the plaster are as follows.

**Dry volume of plaster = 1.33 x Wet volume of Plaster**

To calculate the quantity of cement.

**Cement = (Ratio of Cement Sum of Ratio of Cement and Sand) x Dry Volume of Plaster**

Here we will get the quantity of cement in m^{3} and we can calculate the consumption of cement for plastering work by dividing the total cement quantity by the volume of one cement bag.

After that, we have to calculate the quantity of sand required for the plastering work.

**Sand quantity = (Ratio of Cement Sum of Ratio of Cement and Sand) X Dry Volume of Plaster**

Here we will get the quantity of sand required for the plastering work.

Also, Read: What Is Gypsum Plaster

## How Much Cement in 1 Cubic **Metre** Brickwork?

Here we will calculate how much sand and cement for brickwork.

- The size of the modular brick is 190 x 90 x 90 mm.
- Mortar Thickness is 10mm.
- Assume required brickwork volume is 1 cubic
**metre**(m^{3}).

Also, Read: Rate Analysis of Plastering Calculator | What is Rate analysis of Plaster | How to Use Calculator

## How to Calculate Quantity of Cement Mortar in Brickwork and Plaster?

- The brickwork consists of bricks and cement mortar.
- So firstly we have to find the volume of bricks with mortar thickness and the volume of bricks alone.

### Volume of Bricks with Mortar.

Size of Brick without mortar = 190 x 90 x 90 mm

Volume of 1 brick with mortar = 200 x 100 x 100 mm

(by taking 10 mm mortar thickness on all sides)

So that the number of bricks required for 1 cubic **metre** is as follows.

**Bricks Qty = Calucrtion Area/ Volume of 1 Brick with Mortar.**

**Bricks Qty. =** 1/0.002

**Bricks Qty. = **500 nos

Here,

- Volume of 1 brick with mortar = 0.2 x 0.1 x 0.1 m
- Volume of 1 brick with mortar =
**0.002 Cu.m. (m**^{3}) - The Volume of brick with mortar =
**0.002 Cu.m. (m**^{3})

There are total **500 number of bricks** are required for the construction of the one cubic **metre** brickwork.

### Volume of Bricks Without Mortar.

**Volume of 1 brick without mortar in mm**= 190 x 90 x 90 mm**Volume of bricks without mortar in m**= 0.19 X 0.09 X0.09.**Volume of 1 brick without mortar in cubic metre**= 0.001539 Cu.m. (m^{3})**Volume of 500 bricks without mortar in cubic metre**= 500 X 0.001539 Cu.m. (m^{3})**Volume of bricks without mortar for 1****cubic metre**=**0.7695**Cu.m. (m^{3})

Also, Read: Types of Plaster Finishes (List of Plaster Finishing)

## How to Calculate Cement Consumption in Brickwork?

After that, we have to calculate the amount of cement mortar required for brickwork

**Required Amount of Cement Mortar = 1 m**^{3 }– Volume of Bricks without Mortar**Required Amount of Cement Mortar**= 1 – 0.7695**Required Amount of Cement mortar**=**0.2305 Cu.m.**(m^{3}) (Wet Condition)

The volume is in a wet state so that we need 0.2305 cement mortar in mixed condition (after adding water). In order to calculate the dry volume, we have to multiply 33 % as bulkage of sand.

**Dry Volume of a Mortarr = Required Amount of Cement mortar**x [(100 + 300) %]**Dry Volume of a Mortar =**0.2305 m^{3}x 1.33**Dry Volume of a Mortar**= 0.306565 m^{3}

We know the **cement mortar ratio for brickwork** is **1:6** (where the 1 part is of Cement and the 6 Part Sand).

The sum of this** cement sand Ratio is = 1+6 = 7**.

**Required Amount Cement Quantity in Brickwork**=**Dry Volume of a Mortar x Cement Sand Ratio x Density of Cement****Required Amount Cement Quantity in Brickwork**= 0.306565 x 1/7 x 1440 kg**Required Amount Cement Quantity in Brickwork**= 63 Kg**Required Amount Cement Quantity in Brickwork = 63 kg/ 50 kg ( Cement Bag Weight)****Required Amount Cement Quantity in Brickwork =**1.26 bags**Required Amount of Sand**=**Dry Volume of a Mortar x Sand Cement Ratio****Required Amount of Sand**= 0.306565 x 6/7**Required Amount of Sand**= 0.26277 Cubic**metre**(m^{3})

So for the construction of 1 cum of brickwork, we need

**500 Numbers of brick.****63 kg of cement.****263 m**^{3 }of sand.

Also, Read: Definition Related for Plastering Work | Tools For Plastering | Preparation of Background for Plastering

### Plastering Work-

Plaster is a thin layer of mortar applied over the masonry surface and it acts as a damp-proof coat over the brick masonry work. Plastering also provides a finished surface over the masonry that is firm and smooth hence it enhances the appearance of the building.

### Cement Plastering-

**Cement plaster** is a mixture of water, fine aggregates, and Portland **cement**. **Cement** and sand are mixed in different amounts to obtain the **cement plaster**. For interior walls, a single coat of **plaster** is usually enough for a nice surface.

### Plastering Thickness-

Recommended thickness of plastering for brick walls is **12 MM**, **15 MM** or **20 MM**. **12 MM** thick cement plaster is done where the plain surface of brick masonry is plastered. **15 MM** cement plaster is required on the rough side of 9” and 4.5” wall.

Also, Read: What Is Plaster | Methods of Plastering

### Cement Mortar Ratio-

Cement Mix Ratio of Mortar |
General Usage Recommended |

1:3 | Very rich mortar mix. Not recommended for general usage at sites. Can act as a repair mortar with a waterproofing/bonding agent |

1:4 | For External Plaster and for ceiling plaster |

1:5 | Brickwork Mortar and for Internal plaster (If sand is not fine Fineness Modulas > 3) |

1:6 | For Internal Plaster (if fine sand is available) |

### Plastering Calculation-

**Step 1.** Density of Cement = 1440 kg/m^{3}.

**Step 2.** Sand Density = 1450-1500 kg/m^{3}.

**Step 3.** Density of Aggregate = 1450-1550 kg/m^{3}.

**Step 4.** How many KG in 1 bag of cement = 50kg.

**Step 5.** Cement quantity in liters in 1 bag of cement = 34.7 litres.

**Step 6.** 1 Bag of cement in cubic metres = 0.0347 cubic **metre**.

**Step 7.** How many CFT (Cubic Feet) = 1.226 Cu.Ft.

**Step 8.** Numbers of Bags in 1 cubic **metre** cement = 28.8 Bags

### Ceiling Plastering Ratio-

Cement Mix Ratio of Mortar |
General Usage Recommended |

1:3 | Very rich mortar mix. Not recommended for general usage at sites. Can act as a repair mortar with a waterproofing/bonding agent |

1:4 | For External Plaster and for ceiling plaster |

1:5 | Brickwork Mortar and for Internal plaster (If sand is not fine Fineness Modules > 3) |

1:6 | For Internal Plaster (if fine sand is available) |

Also, Read: What Is Plaster | Types of Plaster As Per Material | Defects In Plastering

### Cement Consumption in Plaster-

**Cement consumption** in 12mm thick **plaster** 1:4 for 1 m^{2} **plastering** of a brick wall is 0.092 bags (4.6 kg) **cement**. Ans :- 4.6 kg (0.092 bags), 46 kg (0.92 bags) & 460 kg (9.2 bags) are **cement consumption** and requirement in 12mm thick **plaster** 1:4 for 1 m^{2}, 10 m^{2} & 100 m^{2} area of brick wall respectively.

### Cement Mortar Ratio for Brickwork-

**1:6** ratio of cement mortar is usually used for brickwork. In order to calculate the amount of Cement, Sand or Mortar required or brickwork firstly find out the amount of mortar required for brickwork. After adding water to the mortar mix, it bulks and reduces the volume by **33%** during wet condition

### Cement Calculation Formula for Plastering-

**Step 1.** Density of Cement = 1440 kg/m^{3}.

**Step 2.** Sand Density = 1450-1500 kg/m^{3}.

**Step 3.** Density of Aggregate = 1450-1550 kg/m^{3}.

**Step 4.** How many KG in 1 bag of cement = 50kg.

**Step 5.** Cement quantity in liters in 1 bag of cement = 34.7 litres.

**Step 6.** 1 Bag of cement in cubic metres = 0.0347 cubic **metre**.

**Step 7.** How many CFT (Cubic Feet) = 1.226 Cu.Ft.

**Step 8.** Numbers of Bags in 1 cubic **metre** cement = 28.8 Bags

Also, Read: What Is Plaster | Plaster Ratio | History of Plastering | Requirements of Good Plaster

### How to Calculate Plastering Quantity?

**Step 1.** Density of Cement = 1440 kg/m^{3}.

**Step 2.** Sand Density = 1450-1500 kg/m^{3}.

**Step 3.** Density of Aggregate = 1450-1550 kg/m^{3}.

**Step 4.** How many KG in 1 bag of cement = 50kg.

**Step 5.** Cement quantity in liters in 1 bag of cement = 34.7 litres.

**Step 6.** 1 Bag of cement in cubic metres = 0.0347 cubic **metre**.

**Step 7.** How many CFT (Cubic Feet) = 1.226 Cu.Ft.

**Step 8.** Numbers of Bags in 1 cubic **metre** cement = 28.8 Bags

### How Much Sand and Cement for Brickwork?

1:6 ratio of **mortar** for **brickwork** which means **cement **: **sand** = 1 part of **cement** and 6 parts of **sand**.

### How Much Cement in 1 Cubic Metre Brickwork?

500 bricks, 1.26 bags (63 Kgs) of **cement,** and 9.28 cu ft sand quantity are required for **1 cubic metre of brickwork**.

### How to Calculate Cement Consumption in Brickwork?

Standard Size of Brick = 190 x 90 x 90 (mm) Quality check of brick.

Mortar Thickness is = 10 mm.

Mortar quantity is 0.2305 (Wet Condition) we calculate Dry Value.

Volume = 0.306565x (1/7) = 0.0438.

Volume = 0.306565x (6/7) = 0.2627.

Also, Read: Rate Analysis of Plaster

### How Many Cement Bags Per Square Metre for Plastering?

**0.154 bags** cement required per square metre for plastering in case of 20 thick plaster & cement sand ratio 1:4.

### How to Calculate the Cement Sand Quantity for Plastering?

- Density of Cement = 1440 kg/m
^{3}. - Sand Density = 1450-1500 kg/m
^{3}. - Density of Aggregate = 1450-1550 kg/m
^{3} - How many KG in 1 bag of cement = 50kg.
- Cement quantity in liters in 1 bag of cement = 34.7 litres.
- 1 Bag of cement in cubic metres = 0.0347 cubic metre.
- How many CFT (Cubic Feet) = 1.226 Cu.Ft.
- Numbers of Bags in 1 cubic metre cement = 28.8 Bags

### How to Calculate the Cement Sand Quantity for Brickwork?

- Standard Size of Brick = 190 x 90 x 90 (mm) Quality check of brick.
**Mortar**Thickness is = 10 mm.**Mortar quantity**is 0.2305 (Wet Condition) we**calculate**Dry Value.**Volume**= 0.306565x (1/7) = 0.0438.**Volume**= 0.306565x (6/7) = 0.2627.

### How to Calculate Quantity of Cement Mortar in Brickwork and Plaster?

- Standard Size of Brick = 190 x 90 x 90 (mm) Quality check of brick.
**Mortar**Thickness is = 10 mm.**Mortar quantity**is 0.2305 (Wet Condition) we**calculate**Dry Value.**Volume**= 0.306565x (1/7) = 0.0438.**Volume**= 0.306565x (6/7) = 0.2627.

Also, Read: What Is Mortar | How to Make Mortar | How to Mix Mortar | Uses of Mortar | Cement Mortar in Construction

### How to Calculate the Amount of Cement & Sand Required for Plastering?

**Step 1.** Standard Size of Brick = 190 x 90 x 90 (mm) Quality check of brick.

** Step 2. Mortar** Thickness is = 10 mm.

** Step 3. Mortar quantity** is 0.2305 (Wet Condition) we

**calculate**Dry Value.

** Step 4. Volume** = 0.306565x (1/7) = 0.0438.

** Step 5. Volume** = 0.306565x (6/7) = 0.2627.

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