How Many Cement Bags Per Square Metre for Plastering | Cement Plastering | Cement Mortar Ratio | Plastering Work | Cement Consumption in Plaster

All About Cement Plastering qty

Introduction of Cement Plastering:

  • 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: What Is Plaster | Requirement of Good Plaster | Types of Plasters

How Many Cement Bags Per Square Metre for Plastering?

Cement Bags Per Square Meter

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 m3

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 m3

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 M3.

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 m3

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 m3

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 m3
  • 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 m3 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 | Advantage and Disadvantage of Gypsum Plaster

How Much Cement in 1 Cubic Metre Brickwork?

Cement in 1 Cubic Meter 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 (m3).

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. (m3)
  • The Volume of brick with mortar = 0.002 Cu.m. (m3)

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

Also, Read: Plaster Calculator | How to Work Plaster Calculator | What Is Plaster Calculation | How to Plaster Calculation for Wall

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. (m3)
  • Volume of 500 bricks without mortar in cubic metre = 500 X 0.001539 Cu.m. (m3)
  • Volume of bricks without mortar for 1 cubic metre= 0.7695 Cu.m. (m3)

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

How to Calculate Cement Consumption in Brickwork?

Cement Consumption in Brickwork

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

  • Required Amount of Cement Mortar = 1 m3 – Volume of Bricks without Mortar
  • Required Amount of Cement Mortar = 1 – 0.7695
  • Required Amount of Cement mortar  = 0.2305 Cu.m.  (m3) (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 m3 x 1.33
  • Dry Volume of a Mortar = 0.306565 m3

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 (m3)

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

  • 500 Numbers of brick.
  • 63 kg of cement.
  • 263 mof sand.

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


Short Note

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 cementCement 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 MM15 MM or 20 MM12 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/m3.

Step 2. Sand Density = 1450-1500 kg/m3.

Step 3. Density of Aggregate = 1450-1550 kg/m3.

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 m2 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 m2, 10 m2 & 100 m2 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/m3.

Step 2. Sand Density = 1450-1500 kg/m3.

Step 3. Density of Aggregate = 1450-1550 kg/m3.

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/m3.

Step 2. Sand Density = 1450-1500 kg/m3.

Step 3. Density of Aggregate = 1450-1550 kg/m3.

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?

  1. Density of Cement = 1440 kg/m3.
  2. Sand Density = 1450-1500 kg/m3.
  3. Density of Aggregate = 1450-1550 kg/m3
  4. How many KG in 1 bag of cement = 50kg.
  5. Cement quantity in liters in 1 bag of cement = 34.7 litres.
  6. 1 Bag of cement in cubic metres = 0.0347 cubic metre.
  7. How many CFT (Cubic Feet)  = 1.226 Cu.Ft.
  8. Numbers of Bags in 1 cubic metre cement = 28.8 Bags

How to Calculate the Cement Sand Quantity for Brickwork?

  1. Standard Size of Brick = 190 x 90 x 90 (mm) Quality check of brick.
  2. Mortar Thickness is = 10 mm.
  3. Mortar quantity is 0.2305 (Wet Condition) we calculate Dry Value.
  4. Volume = 0.306565x (1/7) = 0.0438.
  5. 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.

1 thought on “How Many Cement Bags Per Square Metre for Plastering | Cement Plastering | Cement Mortar Ratio | Plastering Work | Cement Consumption in Plaster”

  1. I like the knowledge in this page I need to know more about the calculation of cement sand for plastering if I have area of 120meters length and height is 520meter how many cement, sand required thanks

    Reply

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