How to Calculate the cost Of Roofing Sheets.

I am going to estimate the cost of roofing sheets for a 3 bedroom apartment measuring L 12m by W 14m, Where L = Length and W = Width or wideness.

First thing to do is to find the area by Multiplying both dimensions

Thus 12 x 14 = 168m²

Now Lets add some 20% to the total area as the Slope or Pitch of the roof


20/100 x 168 = 33.6

thus 168 + 33.6 = 201.6m²

Next, we measure the length and width of our chosen roofing sheet

It could be any of;
Metro tiles.
Aluminum sheets.
Cameroonian Zinc.
Zinc.
Asbestos.


We are going to assume The length of each roofing sheet to be used is measured 2.6

Lets also assume the Width is 1.8 meter


Thus, we multiply the dimensions to get the area of one roofing sheet

Thus L x B = 2.6 x 1.8 = 4.68m²

Now we know the area of each roofing sheet, we also know the area of the total area to be roofed

The next step is to Divide the bigger area (Area of roof) by the smaller area
(Area of each roofing sheet)

Thus 201.6/4.6 = 43.8 Sheets

It Therefore means we will be needing some 44 roofing sheets to cover the entire roof.
Assuming the cost of aluminum roof is 2650 per SQM.
Then, 2650×43.8 sheets=116,600.
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