Roof Estimating Formulas

The average roof replacement cost is 4 200 6 600 on a 1 600 sq ft.

Roof estimating formulas.

Steep slope roof pitch of 12 or 45 degrees. Rafter rise run this formula is from the pythagorean theorem. To get the slope of your roof based on degrees roof rise or x inches per 12 run use our roof pitch calculator. L 30 feet h 12 feet 30 12 2 180 square feet.

The length l times the height h of a triangle is twice its area a2. It is often compared to slope but is not exactly the same. Otherwise use the table or diagram below. So if you divide your answer of a product of length times height by two you will get the area of a triangle.

Here are the equations you may use to solve for the length of the slope and the rafter. Ranch house using asphalt roof shingles. Use the following formula which also describes a right triangle. Roof pitch roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

Medium slope roof pitch of 6. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Medium low slope roof pitch of 3 or 4. 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.

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. 1 roof square 100 square feet. To accurately calculate the area of your roof you must first determine its slope or pitch.