Formula For Measuring A Hip Roof

Calculate the amount of asphalt or fiberglass shingles needed to cover a hip roof.

Formula for measuring a hip roof.

This theorem states that the length of a right triangle s hypotenuse is equal to the square root of the sum of the squares of the lengths of the triangle s other two sides. The difference is in the amount of ridge capping you need and the amount you will waste. A hip roof s square footage is equal to that of a gable roof with the same dimensions. Doing so will give you the total square footage of your roof.

Step 5 multiply the total square foot area of the hip roof by 5 percent or 05 for the amount of extra roofing material you ll need to allow for waste due to roofing error or damaged material. If you re trying to work out the total area of the roof of a square building simply multiply the area of one of the identical faces by 4. The top ridge will be shorter for a hip roof but the 4 hips will add to the amount of ridge capping needed and because of the angles the amount of waste will be higher than for a similar sized gable roof. The square footage of a hip roof area is identical to the square footage of a gable roof of the same size.

1 pyramid hip roof roof base is a square roof sides are identical isosceles triangles 2 hip roof roof base is a rectangle two sides are identical isosceles triangles and two sides are identical trapeziums. The only difference in this calculation to the one for a gable roof area is the amount of the ridge. The top ridge will be shorter than the one of the gable roof but the four hips will add to the ridge length. Add the combined areas of the 2 longer faces with those of the 2 shorter faces.

The pythagorean theorem allows you to calculate the length of the hip rafter without measuring it directly which requires you to climb onto the roof. Here you can calculate hip roof parameters by hip raise and. H b x tan α 2 common rafters b 2 x cos α hip rafters h 2 b 2 2 hip roof area 2 x common rafters x roof base length where h roof rise b roof base width α roof pitch tan tangent cos cosine. Add the areas of the faces of the hip roof to find the total area of the hip roof in square feet.