How To Figure Square Board Feet Needed For Roof

Measure your house at ground level then add in the roof s overhang for greater accuracy.

How to figure square board feet needed for roof.

Please enter side s surface area. A 4 8 sheet of plywood is 32 ft 2. 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. Board feet length ft width in thickness in 12.

This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. Board feet 8 10 1 25 12. Choose the dimensions of the boards. Measure gables dormers and any other areas not included in the sides.

One sheet 32 ft. This basically calculates the number of sheets needed for a gable roof. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed.

Substitute these numbers into the board foot formula to find the board footage per piece. Outside of the u s a degree angle is typically used. Roof pitches in degrees. The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements.

The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. 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. For example a piece of hardwood can be 8 feet long 10 inches wide and 1 25 inches thick. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.

So dividing the area of the roof by 32 will give you the number of sheets needed.