Roof Measuring Formula

So if you divide your answer of a product of length times height by two you will get the area of a triangle.

Roof measuring formula.

If this distance measures 4 inches you have a 4 in 12 pitch. 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. On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof. How to calculate your roof square footage first measure the length and width of each surface on the roof then multiply these values to get the square footage of that surface.

See the diagram. 1 roof square 100 square feet. To find the squares divide the overall roof area by 100 and then round up. Climb to the top of your roof.

Don t use this as your only method of measuring. Rafter rise run this formula is from the pythagorean theorem. 8 inches and you have an 8 in 12 pitch. Here are the equations you may use to solve for the length of the slope and the rafter.

Keep in mind that using google earth isn t going to give you a 100 percent accurate reading but it will give you a basic idea of the size of the roof for your calculations for the roofing materials. If its pitch is 6 in 12 a pitch multiplier of 1 12 multiplying 1 152 sq ft 107 0 m 2 by 1 12 would give you an overall square footage of 1 290 square feet 120 m 2. If your house has a hip roof then it does not matter which side is the length and which is the width for an accurate result. First use your measuring tape to measure 12 inches on your large level and make a mark at the 12 inch line.

The length l times the height h of a triangle is twice its area a2. This is simply 100 square feet of roof. It is often compared to slope but is not exactly the same. Pitch measurement method 1.

To calculate the area of your roof first you ll need to calculate the pitch of it. L 30 feet h 12 feet 30 12 2 180 square feet. For instance if the roof is 1550 square feet then it is 16 squares. You can also calculate roof pitch even without using a roof slope calculator.

A square simply refers to a 10 x 10 square of roofing. Roof pitch roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Use the following formula which also describes a right triangle. This is only important for gable roofs as the calculator uses a specific formula to estimate roof run length of gable.

Make sure to document the number of chimneys skylights or other obstructions and include dormers in your measurements. Measure both the width gable side and the length eave gutter side.