How To Figure Square Footage Of A Pitched Roof

Outside of the u s a degree angle is typically used.

How to figure square footage of a pitched roof.

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. For example a 4 12 pitch roof that is 100 square feet. First multiply the length by the width. Add 1 then take the square root.

The answer is the number of roofing squares for the roof. Dividing by 12 gives the. Use our roof pitch calculator to find the pitch of your roof. Multiply the square footage of your roof by 1 to get the 10 percent waste allowance.

Then take the product of these two dimensions and multiply it by your pitch multiplier. The pitch of the roof is the rise over a 12 inch run. The number you get will be an accurate estimate of how much area you have to cover for your roofing project. Roof pitch is given as the number of inches in height change over the distance of one foot.

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. The length l times the height h of a triangle is twice its area a2. Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. Roof pitch area multipliers.

Divide your roof pitch by 12. 100 1 054 105 4ft 2. So keeping with our roof pitch of 4 this gives us 1 9. 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.

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. Multiply the area by the pitch multiplier to get the roof s square footage. For example if your roof s pitch is 4 in 12 you would divide 4 by 12. If this distance measures 4 inches you have a 4 in 12 pitch.

8 inches and you have an 8 in 12 pitch. Estimate the pitch of 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. This would yield 1 3.

Straight to the answer. L h 2 area calculating an area of a triangle when estimating a roof. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.

1 roof square 100 square feet. Square the result of step 1.