Tips to calculate cement sand quantity in plaster
In this exclusive civil engineering article, you will learn how to work out the quantity of cement and sand in internal and external plaster.
Normally, the thickness of interior plaster remains 12 mm or 0.012 m and exterior plaster 19 or 20 mm.
Suppose, the dimension of the plaster is taken as 1m x 1m and the thickness is 0.012m.
Normally, the ratio of plastering in job site remains 1:6 (1 part cement and 6 part cement)
Initially, it is required to determine the volume of plaster as follow :-
Volume of mortar in plaster = Length x Breadth x Height = 1 x 1 x 0.012 = 0.012 cum
This volume is determined in weight condition and it should be converted to dry condition, just multiply the weight volume with 1.33 as 33% is increased.
Dry volume = 0.012 x 1.33 = 0.01596 cum
The quantity of cement in dry volume will be calculated as follow :-
Cement = 0.01596 x 1/7 x 1440 = 3.28 kg (sum of ratio = 1+6 = 7; density of cement = 1440 kgs/m3)
To convert the quantity to bags, divide with 50 i.e. 3.28/50 = 0.0656 bags.
The quantity of sand in dry volume will be calculated as follow :-
Sand = 0.01596 x 6/7 x 35.31 = 0.483 cft (1 cubic meter = 35.31 cubic feet)
Another useful way to calculate sand quantity :-
0.0656 x 6 x 1.226 (quantity of cement = 0.656 bags; 1 bag cement = 1.226 cft) = 0.483 cft
To determine the quantity of exterior plaster, the process is same as above but just change the 20 mm to meter and put the value in calculation.