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How to Calculate Quantity of Cement, Sand & Water required for Plastering Estimate

In this Article today we will talk about the Quantity of Cement Sand and Water in Plastering | Calculation of Materials for Plastering | How much Cement and Sand Required for Plastering | Plastering Estimate | How to Find Plastering Quantity | Quantity of Materials for Plaster | Requirements of Good Plaster | Strength of Plastering | Cement Mortar Calculation for Plastering

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. Calculation of Materials for Plastering

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. Calculation of Materials for Plastering

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

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. Cement Mortar Calculation for Plastering

Requirements of Good Plaster:

  1. It should adhere to the background and should remain adhered during all climatic changes. Requirements of Good Plaster
  2. It should be cheap and economical.
  3. It should be hard and durable.
  4. It should be possible to apply it during all weather conditions.
  5. It should effectively check the entry or penetration of moisture from the surfaces.
  6. It should possess good workability. Plastering Estimate

Strength of Plastering / nominal mix:

Architects refer the following concrete code table in drawing. Knowing this table will help you in deciding the proportion of cement, sand and gravel in Plastering. Plastering Estimate 
Plaster type Description
12mm 12 MM thick cement plaster is done where the plain surface of brick masonry is plastered.
15mm 15 MM cement plaster is required on the rough side of 9” and 4.5” wall.
18mm 18 MM thick cement plaster with neat cement slurry is required for making ‘Dado’ with the cement concrete flooring.
20mm 20 MM thick cement plaster is done in two coats in some cases on rough side of wall or according to the design requirement.

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

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How to Calculate Quantity of Cement Sand and Water in Plastering

General points to be remembered in Plastering work calculation Plastering Estimate

  • 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/m3
  • Each bag of cement weighs = 50 Kgs or 110 lbs
  • The Volume of each cement bag = 50Kgs/1440 = 0.0348 m3.
  • The dry density of sand = 1600Kgs/m3
  • 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. Plastering Estimate

Total Plastering = First coat + Second Coat How to Find Plastering Quantity

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.

How to Find Plastering Quantity Cement Mortar Calculation for Plastering

Calculate Quantity of Cement and Sand in Plaster:

Steps involved in calculation of plastering quantities:

  1. Find the total area of wall to be plastered in Sqm (m2).
  2. Consider the ratio and thickness of plastering
  3. Calculate the Total Volume of Plastering
  4. Find out the Volume of Cement and Sand individually for both the coats
  5. 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: How to Find Plastering Quantity

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

Step 1: Calculate the Area of Plastering

Area = width x height = 10 x 10 = 100m2 Quantity of Materials for Plaster

Step 2: Find the Wet Volume of Plastering 

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

= 100m2 x 12mm (Convert mm to m)

= 100×0.012 = 1.2m3

Hence, Wet Volume of First Coat of Plastering = 1.2m3

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

= 100m2 x 8mm (Convert mm to m)

= 100×0.008 = 0.8m3

Therefore Wet Volume of  Second coat of plastering = 0.8m

Step 3: Find the Dry Volume of Plastering 

Dry Volume of First Coat = Wet Volume of First Coat x 1.33

= 1.2 m2 x 1.33

= 1.596 m3

Hence, Dry Volume of First Coat of Plastering = 1.596 m3

The Dry volume of Second Coat = Wet Volume of Second Coat x 1.33

= 0.8 m3 x 1.33

= 1.064 m3

Therefore Dry Volume of  Second coat of plastering = 1.064 m

Step 4: 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 Materials for Plaster

Quantity of Cement required for First coat 
= (Total Volume of first coat plastering  x No. of Parts of cement) ÷ Total Parts Cement Mortar Calculation for Plastering

= 1.596 x 1/6  = 0.266 m3

Quantity of Sand required for First coat =
(Total Volume of first coat plastering x No. of parts of sand) ÷ Total Parts
 

= 1.596 x 5/ 6 = 1.330 m3

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 Materials for Plaster

Quantity of Cement required for Second coat
= (Total Volume of second coat plastering  x No. of Parts of cement) ÷ Total Parts
 

= 1.064 x 1/4 = 0.266 m3

Quantity of Sand required for Second coat
= (Total Volume of second coat plastering x No. of parts of sand)÷ Total Parts
 

= 1.064 x 3/4 = 0.798 m3 Quantity of Materials for Plaster

Step 5: Finding the quantity of Cement Bags:

Total Quantity of Cement = Quantity of Cement for First Coat + Quantity of Cement for Second Coat

Total Quantity of Cement = 0.266 + 0.266 = 0.532 m3

As mentioned above volume of 1 bag of cement (50kgs) = 0.0348m3
For 0.532 m3 = 0.532 x 50 / 0.0348 = 764.36 Kgs = 15.28 bags
 
Similarly, Total Quantity of Sand = Quantity of Sand  for First Coat + Quantity of Sand for Second Coat
 
Total Quantity of Sand = 1.330 + 0.798 = 2.128 m3
 
Similarly,  for Sand 1m3 = 1600Kgs. 2.128 m3 = 2.128 x 1600 = 3404.8 Kgs = 3.4 tonnes

Step 6: 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 (764.36 + 3404.8) = 0.2 x 4169.16 = 833.832 = 834 litres. Requirements of Good Plaster

Final Result:

The Quantity of cement required = 764.36 Kgs
Calculated Quantity of Sand (Fine aggregate) required = 3404.8 Kgs
Quantity of Water required = 834 litres.

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, 100m2= 574 Kgs of cement 1m2 = 574/100 = 5.7Kgs Requirements of Good Plaster

Summary:

Quantity of Cement, Sand & Water required for Plastering. For 100m2 of Wall, if first & second coat of cement mortar ratio 1:5 & 1:3 laid then
 
The Quantity of cement required = 764.36 Kgs
Calculated Quantity of Sand (Fine aggregate) required = 3404.8 Kgs
Quantity of Water required = 834 litres.

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Conclusion:

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4 COMMENTS

  1. The w/c (20%) is considered based on weather and the environmental conditions of area where the construction takes place

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