How To Figure Square Footage Of A Pitched Roof

The answer is the number of roofing squares for the roof.

How to figure square footage of a pitched roof. Once you have your roof s pitch divide the number by 12. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. Multiply the square footage of your roof by 1 to get the 10 percent waste allowance. Estimate the pitch of the roof.

Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. The length l times the height h of a triangle is twice its area a2. The number you get will be an accurate estimate of how much area you have to cover for your roofing project. Straight to the answer.

Dividing by 12 gives the. The total amount of roofing material you need is 17 300 1 730 19 030 square feet. So keeping with our roof pitch of 4 this gives us 1 9. L h 2 area calculating an area of a triangle when estimating a roof.

100 1 054 105 4ft 2. This would yield 1 3. Roof pitch is given as the number of inches in height change over the distance of one foot. Pitch measurement method 1.

For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. To conclude the example if your total roofing area is 17 300 square feet your waste allowance would be 17 300 x 1 1 730 square feet. If this distance measures 4 inches you have a 4 in 12 pitch. Square the result of step 1.

For example a 4 12 pitch roof that is 100 square feet. 8 inches and you have an 8 in 12 pitch. 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. So if you divide your answer of a product of length times height by two you will get the area of a triangle.

Use our roof pitch calculator to find the pitch of your roof. 1 roof square 100 square feet. Multiply the area by the pitch multiplier to get the roof s square footage. Roof pitch area multipliers.

Divide your roof pitch by 12. Outside of the u s a degree angle is typically used. First multiply the length by the width. If you don t want to do a lot of measuring you can use your pitch calculation to get an estimated square footage of your roof.

Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. 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.