# Application of thumb rule for the estimation of various building materials In this construction video tutorial, one will learn the fundamentals of thumb rules which are applied in making the rough estimation of the various materials employed in construction works.

Suppose, the total covered areas of the construction site are taken as 1500 square feet. It comprises of foundation, plinth, lintel, beam, column and roof area.

Suppose, cement is used in various locations as 600 bags, 590 bags, 570 bags etc.

Therefore, approx quantity of cement bags used in different locations is 600+590+570/3 = 586.7 bags

Suppose, sand is used in various types of construction works as 1800 cft, 1900 cft, 200 cft.

Therefore, approx quantity of sand used for different locations is 1800+1900+2000/3 = 1900 cft

Suppose, aggregate is used for various types of construction works as 1500 cft, 1600 cft, 1700 cft.

Therefore, approx quantity of aggregate used in various locations is 1500+1600+1700/3 = 1600 cft

So, from the above figure, we get that for 1500 cft area, sand is used 586.7 bags

For 1 square feet, 586.7/1500 = 0.39 bags

This is the application of thumb rule.

If the covered area is changed, the quantities of materials will also be changed.

The same process can be applied for finding out the quantities of cement and aggregates in 1 square feet.