In this article, you will learn the calculation process to find out the quantity of cement sand for plastering.

In engineering practice, we take the following points **as reference** for plastering work:

**For wall plastering, Cement Mortar Ratio used is 1:6****For ceiling plastering, Cement Mortar Ratio used is 1:4****Thickness of plastering should not be more than 12 mm.****Cement & Sand should be mixed well.**

**For more information read this article:** Tips you need to follow before, during and after plastering walls

To calculate the required quantity of Cement, Sand required for plastering we need to have the following data:

**Thickness of plaster****Mix-ratio of cement sand****Area to be plastered**

**Calculation process for finding the quantity of cement, sand, and water for plastering**

For a civil engineer or constructor, it is important to know the exact amount of cement, sand required for plastering purposes before starting work.

**Step 1:- Find out the Area to be plastered, thickness and mix ration of cement sand.**

- Area of Plaster = 100-meter square
**(Assumed)** - Thickness of plaster = 12 mm =0.012 m
- Mprtar Mix Ratio → 1:4

**Step 2:- Find out Volume to be Plastered**

**Volume of plaster = Area of plaster x Thickness of plaster**- Volume of plaster = 100 x 0.012 = 1.2 m³

**Add 15-20% extra Quantity for Filling of joints & Wastage.**

- Volume of plaster = 1.2 + [ (1.2 x 15) /100 ] = 1.38m³

*Since, Dry volume of materials is 53% more than wet volume so**,*

**Dry Volume of material required for plaster = Wet volume x 1.53**

- Dry Volume = 1.38 x 1.53 = 2.1114 m³

Also Read: Method to calculate Quantity Of Soil/Sand For Filling Plot.

**Step3:- To find Out the Quantity of Cement required for plastering**

To find out the quantity of cement required for the plastering purpose it is calculated by:

**Quantity of Cement = (Dry Volume of material required for plaster x Cement ratio) / (Sum of the ratio)**

- Quantity of cement = (2.1114 x 1) /(1+4)= 0.42228
**m³**

**We know that, the Density of Cement = 1440kg/m³**

- Weight of Cement = 1440 x 0.42228 =
**608.083 Kg**

Since, 1 bag of cement contain 50 kg of cements.

- Number of bags = 608.083 Kg/50 =
**12.161 No’s which is 13 bags.**

**Step 4:- To find out the Quantity of Sand required for plastering**

Since, our cement and sand ratio is 1:4.

- Total Quantity of Sand required= Quantity of Cement x 4
- Total Quantity of Sand required= 0.42228 m³ x 4 =
**1.68912 m³**

Note: 1 m³=35.3147 Cubic Feet (CFT)

Total Quantity of sand = 1.68912 x 35.3147 = **59.65 CFT**

**We know that, the Density of sand = 1920 kg/m³**

Weight of sand = 1.68912 x 1920 = **3243.11 kg**

**Step 5:-** **To find out the quantity of water required for cement sand mixture**

The Quantity of water equals to 20% Total Dry material (cement & sand)

** Quantity of water = **0.20 x (Weight of cement + Weight of sand )

Therefore, Quantity of water = 0.20 x (608.083 + 3243.11 ) = 770.23 kg = 770.23 Liters

**NOTE:** 100 Square meter is a huge area just for calculation purpose we assume that.

In this way, you can calculate the required quantity of cement sand for plastering the walls, ceilings.

**You may also love to read: **Methods to find out Quantities of Materials in Estimation

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