Hips form the triangular sections at the ends of the roof.
Home centers and lumber yards sell shingles in packages, and each package covers a specific number of square feet. Roofers will refer to the number of shingles required as a square, meaning 100-square-feet or a 10-foot by 10-foot area. A standard gable roof can be calculated as two rectangles, but calculating the number of square feet for a hip roof adds triangles to the calculation. A hip roof has triangular sections at the the roof ends that lean in to meet the ridge of the roof.
Instructions
1. Round all measurements up to the next foot. Measure from the peak to the eaves down the center of the hip end for the height and along the edge of the eaves for the width. Calculate the area of a triangle -- the hip end -- by multiplying 0.5 x height x width. This gives area in square feet of one hip end of the roof. Multiply this number by 2 to include both hip ends of the roof.
2. Measure the length of the roof peak and the length of the roof eaves. Measure the height from the peak of the roof to the eaves in a line perpendicular to the peak. Multiply the peak length by the height to obtain the area of the rectangular portion of the roof. Multiply the result by 2 to include the front and the back of the roof.
3. Subtract the peak length from the eave length to find the width of the triangle that makes up the remainder of the front of the roof. Multiply the width by height by 0.5 to get the area of the triangle. The triangle includes both ends of the roof. Multiply by 2 to include the front and the back of the roof.
4. Add the area of the two hips, the rectangular area of the front and back, and the triangular area of the front and back together. The result is the total area of the front, back and two hips in square feet.
5. Measure from the peak down to the eave along one ridge on a hip end and multiply the number by 4 to include all four ridges. Add the peak length to the result. Divide the total by 1/2 the total height of a single shingle to obtain the number of ridge and peak shingles required. One three-tab shingle can be cut into three ridge or peak shingles so divide the result by 3 to find the number of three-tab shingles to buy for the hip ridges and the roof peak. Add in a few shingles to account for errors.
6. Divide the area of the roof by the number of square feet in each shingle package and round the number up. Add in 5 percent more shingles for waste and damage and for the first row of shingles on each edge of the roof. Finally, add in the number of shingles required for the roof ridges and peak.
Tips Warnings
Be sure to add in the 5 percent for waste and damage to the number of shingles required for the area of the roof, and not include the ridge and peak shingles which were added in separately. A hip roof has more unusable waste than a standard gable roof so the shingles for hips and the peak are figured separately.
Follow all ladder safety instructions to access the roof top. Make sure the ladder is on firm footing, has the proper angle according the manufacturers instructions and reaches at least 5 feet past the roof edge.
Tags: figure, shingles, roof, front back, square feet, peak length, peak shingles, roof Multiply, shingles required, area front, area front back
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