How To Figure Square Board Feet Of A Roof

Because each 100 square feet of roof is one.

How to figure square board feet of a roof. To calculate arc length without radius you need the central angle and the sector area. Roof pitches in degrees. This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. You will need to express this size in terms of square feet.

1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square. Divide 96 by 12 which is 8 the number of board feet in a single board of this size. This is simply 100 square feet of roof. Measure your house at ground level then add in the roof s overhang for greater accuracy.

For instance if you have 20 boards that are 2 inches by 6 inches by 8 feet multiply 2 by 6 by 8 which equals 96. The calculator cannot account for complex shapes based on a measurement of square footage alone. Multiply the area by 2 and divide the result by the central angle in radians. A square simply refers to a 10 x 10 square of roofing.

Multiply this root by the central angle again to get the arc length. Get the square footage of roof and divide it by 100 and it will give the number of squares you need and for every decimal number over 3 buy a bundle to achieve the amount of material. If your board is 3 thick you need to measure and add the feet and inch figures from the table by three. Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the roofing material calculator.

If the house has an irregular shape measure each part separately figure the separate areas and add them together. 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. Multiply 8 by 20 which is 160 to find the total board feet. For a 3 thick board 3 x 9bf 27 board feet to which we must add 3 x 4 twelfths of a board foot 12 board inches.

Check that your footage measurements are within this range so you can start off on the right foot. Roofing contractors estimate projects and materials by the square so it is crucial to find this measurement to accurately estimate the amount of material needed. To find the squares divide the overall roof area by 100 and then round up. Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure.

The area calculator can be used to calculate the area of a variety of simple shapes that together can comprise the area of the roof.