How To Figure Squares Of A Roof

Divide any irregularly shaped areas of the roof into more manageable triangles and rectangles then calculate square footage for those individual elements and add them to get the total square footage.

How to figure squares of a roof.

If the house has an irregular shape measure each part separately figure the separate areas and add them together. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Roof pitches in degrees. 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.

As an example if your overhang is 12 inches you ll add 2 feet to the overall length and 2 feet to the overall width of the house. So if you divide your answer of a product of length times height by two you will get the area of a triangle. The length l times the height h of a triangle is twice its area a2. 1 roof square 100 square feet.

Convert the area to roofing squares. Outside of the u s a degree angle is typically used. For example take an area made up of a triangle that s 20 feet high and has a base of 40 feet plus a square that s 40 feet by 40 feet. This nominal square footage amount is then multiplied by a factor associated with the roof s pitch.

To find the squares divide the overall roof area by 100 and then round up. For instance if the roof is 1550 square feet then it is 16 squares. A square simply refers to a 10 x 10 square of roofing. Measure your house at ground level then add in the roof s overhang for greater accuracy.