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
 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. 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
 It should adhere to the background and should remain adhered during all climatic changes. Requirements of Good Plaster
 It should be cheap and economical.
 It should be hard and durable.
 It should be possible to apply it during all weather conditions.
 It should effectively check the entry or penetration of moisture from the surfaces.
 It should possess good workability. 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:
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/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 1215mm) 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:
 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: How to Find Plastering Quantity
 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. How to Find Plastering Quantity
Step 1: Calculate the Area of Plastering
Area = width x height = 10 x 10 = 100m^{2 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
= 100m^{2} x 12mm (Convert mm to m)
= 100×0.012 = 1.2m^{3}
Hence, Wet Volume of First Coat of Plastering = 1.2m^{3}
The Wet 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 Wet Volume of Second coat of plastering = 0.8m^{3 }
Step 3: Find the Dry Volume of Plastering
Dry Volume of First Coat = Wet Volume of First Coat x 1.33
= 1.2 m^{2} x 1.33
= 1.596 m^{3}
Hence, Dry Volume of First Coat of Plastering = 1.596 m^{3}
The Dry volume of Second Coat = Wet Volume of Second Coat x 1.33
= 0.8 m^{3} x 1.33
= 1.064 m^{3}
Therefore Dry Volume of Second coat of plastering = 1.064 m^{3 }
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}
= 1.596 x 1/6 = 0.266 m^{3}
= 1.596 x 5/ 6 = 1.330 m^{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 Materials for Plaster}
= 1.064 x 1/4 = 0.266 m^{3}
= 1.064 x 3/4 = 0.798 m^{3 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 m^{3}
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:
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)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 thenOTHER POSTS:

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6 Comments
Thank you Mr Waseem Raja for your valuable information.
On what basis or IS code the water (ie 20%) is considered ? or Can you explain on what basis the w/c ratio is to be considered
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The w/c (20%) is considered based on weather and the environmental conditions of area where the construction takes place
Thanksgiving for missive infor that boosts my knowledge
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