What is the estimated number of squares of asphalt shingles required for a large building with a shed-type roof of size 20' x 80'?

To determine the number of squares of asphalt shingles required for a shed-type roof measuring 20 feet by 80 feet, we first need to calculate the area of the roof. The area can be found by multiplying the length by the width, which in this case is 20 feet multiplied by 80 feet. This results in an area of 1,600 square feet.

Asphalt shingles are commonly sold by the square, with one square covering approximately 100 square feet. To find out how many squares of shingles are needed, divide the total area of the roof by the coverage per square:

1,600 square feet ÷ 100 square feet per square = 16 squares.

However, when estimating the total number of squares needed, it is essential to consider additional factors such as the slope of the roof, waste during installation, and any additional design elements that might require more shingles. Builders typically add an extra percentage for waste and to accommodate cuts that need to be made during installation.

Taking into account the potential waste and other adjustments, an estimate of around 22 squares is reasonable for a project of this size. This figure allows a small buffer for mistakes and accounting for the roof's features.

Thus, the estimation of 22 squares reflects a