Calculation of Cement and Sand Quantity for Plastering

The ratio and all calculations given below are according to the requirement of 12mm thick plastering.

Plastering, as we all know, removes imperfection of external walls along with maintaining the line level and the alignment. Generally, plastering is defined as a protective surface for walls. It can be many a type depending on the materials it uses such as cement plaster, gypsum plaster and lime plaster. These are the common types of plastering that are required for home construction.

Cement plaster has two main materials in its core – cement and sand. The right proportion is required to get the best outcome you expected. This plaster removes imperfections from both inner and outer walls of the construction. Knowing the right proportion is an important factor in the making the paste or mortar perfect for the walls.

The list below contains the ratio between cement and sand that you need to maintain as per the application.

• Cement mortar ratio 1:3 - this mortar mix is not used in general applications. It can be used as a repair mortar when they are combined with a waterproofing or bonding agent.
• 1:4 – for ceiling and external plaster.
• 1:5 – the ratio proved to be good as brickwork mortar. It is also good for internal plaster.
• 1:6 – this ratio can be maintained for internal plaster.

Calculate Cement and Sand Requirement for Cement Plastering:

Calculating the quantities of cement, sand and water depends on a few parameters. These bring out the logic why you need to maintain the ratio.

• Volume of plaster requirement: the volume of plaster can be calculated by multiplying the area of the plaster and the thickness of the plastering (in this case – 12mm)
• Mix Ratio of plaster: deciding the Mix Ratio of plastering contains complex calculation. It indicated the ratio of the volume of cement to sand. Mix ratio of plaster 1:4 means that the mixture has one part cement and 4 parts sand.

For calculating quantity, generally two methods have been applied –DLDB method and Empirical method. These two processes include steps required for a logical distribution of the materials. The calculations and measurements used in this methods based on the quantity of the materials.

For further discussion, read

Calculation of Cement and Sand Quantity for Plastering