Estimation of wall plaster: external & internal plastering

Estimation of wall plaster: external & internal plastering

Plastering is an essential process in construction, used to create a smooth and even surface on walls and ceilings. It not only provides an aesthetic appeal but also protects the structure from moisture, heat, and other external elements. In this article, we will discuss the estimation of wall plaster, both external and internal, which is a crucial step in determining the cost and quantity of materials required for the project. Understanding the process and factors involved in the estimation of plaster can help in achieving a successful and cost-effective construction project.

Estimation of wall plaster

Estimation of wall plaster

Estimation is an important aspect in the construction industry, and it is crucial for civil engineers to accurately estimate the materials and cost for a project. Wall plaster is a common task in building construction, and it is important to estimate the amount of plaster required to cover the walls accurately. In this article, we will discuss the process of estimating wall plaster.

The process of estimating wall plaster can be divided into three main steps: calculation of the area, determination of plaster ratio, and calculation of materials and costs.

Step 1: Calculation of the area

The first step in estimating wall plaster is to calculate the area of the walls that need to be plastered. This can be done by measuring the length and height of each wall in meters and multiplying them to get the total area in square meters. It is important to include all walls, including windows and doors, in the calculation.

For example, if a room has four walls with the following dimensions:

– Wall 1: 4m (length) x 3m (height)
– Wall 2: 4m x 3m
– Wall 3: 5m x 3m
– Wall 4: 5m x 3m

The total area of the walls would be:

(4 x 3) + (4 x 3) + (5 x 3) + (5 x 3) = 6 + 6 + 15 + 15 = 42 square meters.

Step 2: Determination of plaster ratio

The next step is to determine the plaster ratio, which is the proportion of cement, sand, and water used in the plaster mix. The ratio can vary depending on the type of surface to be plastered, the quality of materials, and the skill level of workers. Generally, a 1:6 ratio of cement and sand is used for interior walls, while a 1:4 ratio is used for exterior walls. The water is added to achieve the desired consistency of the mix.

Step 3: Calculation of materials and costs

Once the area and plaster ratio have been determined, the next step is to calculate the materials and costs required for the project. To calculate the quantity of materials, the volume of plaster required needs to be calculated first. This can be done by multiplying the area to be plastered by the thickness of the plaster. The standard thickness of plaster is usually 12-15mm. For our example, we will take a 15mm thickness.

The volume of plaster required would be:

42 sq.m x 0.015m = 0.63 cubic meters.

Now, the quantity of materials can be calculated based on the plaster ratio. For a 1:6 ratio, the quantity of cement would be 1/7th of the total volume and the quantity of sand would be 6/7th of the total volume. Therefore, for 0.63 cubic meters of plaster, we would need:

– Cement: 0.09 cubic meters (0.63/7)
– Sand: 0.54 cubic meters (0.63 x 6/7)

The cost of materials can be calculated by multiplying the volume of materials with their respective rates. This can vary depending on the location and availability of materials.

In addition to materials, labor and transportation costs should also be included in the estimation. The labor cost can be calculated per square meter of plaster, while the


In conclusion, the estimation of wall plaster, both for external and internal surfaces, is an essential aspect of any construction project. It not only helps in budgeting and planning but also ensures the proper application and quality of plaster. Understanding the factors that influence the quantity of plaster required and using accurate measurement techniques can significantly impact the success of the project. By considering the type of wall, surface area, and thickness, one can determine the amount of plaster needed and avoid costly mistakes. It is crucial to consult with experienced professionals and use reputable materials to achieve a smooth and durable finish. By following these guidelines, the estimation of wall plaster can be done effectively, resulting in a well-crafted and visually appealing building.


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