Roof Estimating Formulas

The length l times the height h of a triangle is twice its area a2.

Roof estimating formulas.

Use the following formula which also describes a right triangle. Medium slope roof pitch of 6. The average roof replacement cost is 4 200 6 600 on a 1 600 sq ft. Roof pitch roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. You can also calculate roof pitch even without using a roof slope calculator. Otherwise use the table or diagram below.

Rafter rise run this formula is from the pythagorean theorem. Ranch house using asphalt roof shingles. Steep slope roof pitch of 12 or 45 degrees. It is often compared to slope but is not exactly the same.

Here are the equations you may use to solve for the length of the slope and the rafter. However if you use premium materials such as metal wood shingles clay tile etc the cost of your roof will be at least 9 500 16 000. Medium low slope roof pitch of 3 or 4. L 30 feet h 12 feet 30 12 2 180 square feet.

Roofing cost can vary widely depending on the size and complexity of your roof type of materials you use as well as your location. To get the slope of your roof based on degrees roof rise or x inches per 12 run use our roof pitch calculator. 1 roof square 100 square feet. Medium steep slope roof pitch of 9.