Roof Estimating Formulas

Otherwise use the table or diagram below.

Roof estimating formulas.

Here are the equations you may use to solve for the length of the slope and the rafter. Steep slope roof pitch of 12 or 45 degrees. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Rafter rise run this formula is from the pythagorean theorem.

Roofing cost can vary widely depending on the size and complexity of your roof type of materials you use as well as your location. Ranch house using asphalt roof shingles. To accurately calculate the area of your roof you must first determine its slope or pitch. 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.

It is often compared to slope but is not exactly the same. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Medium low slope roof pitch of 3 or 4. The average roof replacement cost is 4 200 6 600 on a 1 600 sq ft.

Use the following formula which also describes a right triangle. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. So if you divide your answer of a product of length times height by two you will get the area of a triangle. To get the slope of your roof based on degrees roof rise or x inches per 12 run use our roof pitch calculator.

Roof pitch roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Medium steep slope roof pitch of 9. 1 roof square 100 square feet. You can also calculate roof pitch even without using a roof slope calculator.