Before roofing your housing projects,what you need to know.(How to calculate the amount of roofing sheet needed when roofing your building)

In building construction, The Most Common Roof Style Is the Pitch Roof, it is a numerical measure of the steepness of a roof. Roofs may be functionally flat or "pitched".

The roof's pitch is its vertical rise divided by its horizontal span (or "run"), what is called "slope" in geometry and stair construction, or the tangent function in trigonometry.

The Pitch Matters For A Variety Of Reasons Including The Type Of Roofing Material Used, Workability, Proportions To The Building As A Whole Which Is Sometimes A Critical Factor In Some Architectural Styles Such As A Steep Pitch In Gothic Architecture And A Low Pitch In Classical Architecture

Divided at the center which is the apex (at the king post) the pitch roof is the easiest to calculate , but you can ask your roofing sheets supplier for the size of each roofing sheet except you are using long span aluminum roofing sheet which can be cut to exact length of the roof. To make fast calculation, measure the length of the side of building let say ‘x’, measure the width, ‘y’.

To get an approximate surface area we will add an arbitrary value as a safety factor for the difference in length due to the pitch or depth of roof or roof rise.

So let’s say for a house of total length of the front is 12m or 40ft and side which is the longer part is 22m or 73ft.

Area =length of front of house x width of house

Area =12 x 22=264m²,

Add allowance for the pitch or depth or roof rise, say 20% of Area

=20% + 264m² =316.8m².

Now find out the length and breadth of each roofing sheet and also multiply length by breadth. Assuming the ceiling sheet is 3.6m in length and 1.2m in breadth,

Then area of roofing sheet =3.6 x 1.8 =4.32m²

Therefore total numbers of roofing sheets needed approximately is
(Area of building + Allowance)/area of one roofing sheet

=316.8/4.32m = 74 sheets

Please note that this is not a standard way of approximating but this is derived based on site experience. In any case there is no particular standard way.

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