To estimate shingles required for a 20' x 80' storage building with a shed-type roof and a 3' overhang, how many squares do you need including the 10% for waste?

To determine the number of squares of shingles required for the storage building, it's important to first calculate the actual area of the roof and then take waste into account.

For a shed-type roof, the slope of the roof is crucial in calculating the area, but since the basic dimensions are provided (20' x 80'), we can find the area of the roof first and then include the overhang. The overhang adds to the overall length of each side of the roof, so you'll need to factor in the additional 3' overhang on both sides of the length.

1. Calculate the total area of the roof:

• The length of the roof becomes 80' + 2*(3') = 86'.

• Therefore, the area of the roof can be calculated as:

Area = Length x Width = 86' x 20' = 1720 square feet.

2. Convert the area from square feet to squares, noting that 1 square equals 100 square feet:

Total squares without waste = 1720 sq ft / 100 sq ft/square = 17.2 squares.

3. Now, add 10% for waste:

10% of 17.2 squares