Roof Estimating Formulas

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

Roof estimating formulas.

To get the slope of your roof based on degrees roof rise or x inches per 12 run use our roof pitch calculator. 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. Use the following formula which also describes a right triangle. Otherwise use the table or diagram below.

Medium low slope roof pitch of 3 or 4. You can also calculate roof pitch even without using a roof slope calculator. Here are the equations you may use to solve for the length of the slope and the rafter. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

L 30 feet h 12 feet 30 12 2 180 square feet. Rafter rise run this formula is from the pythagorean theorem. Steep slope roof pitch of 12 or 45 degrees. The average roof replacement cost is 4 200 6 600 on a 1 600 sq ft.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. 1 roof square 100 square feet. Medium steep slope roof pitch of 9. To accurately calculate the area of your roof you must first determine its slope or pitch.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. It is often compared to slope but is not exactly the same. Medium slope roof pitch of 6. Ranch house using asphalt roof shingles.