PLASTER WORK CALCULATION

1. PLASTER WORK ESTIMATION

A man is plastering a  brick wall 

The amount of cement mortar required for 1m² coverage on wall for a plaster work.

Let the thickness of the plaster for one coat external rendering be 15mm.

The volume of a plaster per square meter is given as shown below

Volume = 1m x 1m 0.015m

            = 0.015m³

The dry volume of cement mortar for plaster can be calculated as follows

Dry volume = Wet volume x Wet to dry conversion factor (1.25 - 1.3)

                    = 0.015 x 1.30

                   = 0.0195m³

The mortar constituents can be calculated based on the cement sand mix ratio for example in our calculation we will use mix ratio 1:4 (cement: sand).

The cement volume can be calculated as shown below

Firstly 1+4 = 5 (division number)

Then, for cement we have 1/5 x 0.0195 = 0.0039m³

For sand also can be calculated as follows

Sand volume 4/5 x 0.0195 = 0.0156m³

For wall area other than 1m² we have to multiply the quantity obtained above for 1m² with new area then, we get the quantity of new area.

For example

 If we do have a room of 42m² as the wall area its cement plaster quantification will be as follows.

 Quantity of cement = quantity per 1m²  x measured wall area

                                 = 0.0039x 42

                                  = 0.1638 m³

Quantity of sand      = quantity per 1m²  x measured wall area

                                 = 0.0156x 42

                                 = 0.6552 m³

The volume of plaster constituents (cement and sand) can be different per 1m² due to different in mix ratio and thickness of the plaster.