How Do You Find The Area Of A Roof

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

How do you find the area of a roof. The lower slope length is measured from outside wall to the start of the upper sloped roof section. The length l times the height h of a triangle is twice its area a2. Take your area result and multiply it by the pitch multiplier or slope correction factor found in the table above to arrive at the roof s surface area. If your number is 1 3 squared would yield 1 9 after that add 1 to your number.

Both metric and imperial measurement systems are displayed in a popup menu over the results area. Divide your roof pitch by 12. Dividing by 12 gives the ratio of inches in rise per distance. Now you re ready to price out the materials.

Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100. In cases where a roof has a complex shape such as in the image to the right measuring the dimensions and areas of each part of the roof to calculate total area will result in a more accurate measurement of area. Convert the area to roofing squares. Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118.

1 roof square 100 square feet. This applies to lengths as well as areas. Measure the distance from the surface of the roof to the bottom of the level at the 12 inch mark. For example if your measurement is seven inches the rise is expressed as 7 12 in roofing terminology.

1 9 1. This distance is the rise. Next square your result. The calculated area is only an estimation.

Pitch measurement method 1. Calculating an area of a triangle when estimating a roof. And that s the number you were looking for. For example if your roof s pitch is 4 in 12 you would divide 4 by 12.

8 inches and you have an 8 in 12 pitch. Calculate the square footage of a gambrel style roof using imperial measurements. 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. Calculating the area true once you have your roof s pitch divide the number by 12.

That gives you 5 590 square feet which is the actual area of the surface of the roof.