How Do You Calculate Squares Of Shingles?

Estimating the amount of shingles for a roof is designated by a square. A square, when used in roofing terms, is equal to 100 square feet, or a 10-foot by 10-foot area. This is the exposed portion of the shingles that you can see from the ground. There are typically three bundles of shingles for every square of roofing. Roofing is sold in paper-covered packages, by the bundle. When ordering shingles, it will be a good idea to over-order by at least two extra bundles. Set the ladder in an accessible area to gain access to the roof. If you are uncomfortable with climbing onto the roof, have someone help you. Measure the length of the roof from one end to the other with the tape measure. Run the tape up the width of the roof. Area of the roof is found by multiplying the length times the width (A = L x W). In an example, a basic two-sided gable roof has the dimensions of 45 feet long by 20 feet wide. Multiply 45 feet times 20 feet to find one side of the roof area. The one side is equal ...  more