How To Figure Square Board Feet Needed For Roof

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.

How to figure square board feet needed for roof.

Choose the dimensions of the boards. The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it.

This basically calculates the number of sheets needed for a gable roof. One sheet 32 ft. Board feet 8 10 1 25 12. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size.

Please enter side s surface area. Add side measurements and enter them here. This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. A 4 8 sheet of plywood is 32 ft 2.

Measure your house at ground level then add in the roof s overhang for greater accuracy. Multiply height by width to get that side s surface area in square feet. So dividing the area of the roof by 32 will give you the number of sheets needed. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed.

Board feet length ft width in thickness in 12. Substitute these numbers into the board foot formula to find the board footage per piece. For example a piece of hardwood can be 8 feet long 10 inches wide and 1 25 inches thick. Outside of the u s a degree angle is typically used.

Roof pitches in degrees.