How To Figure Plywood For A Roof

Find the average length by measuring at the center of the width.

How to figure plywood for a roof.

Now that the basic concept has been covered let s take a look at a more complex roofing system. The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. This basically calculates the number of sheets needed for a gable roof.

A 4 8 sheet of plywood is 32 ft 2. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. How roof pitch is calculated to accurately calculate the area of your roof you must first determine its slope or pitch. L 30 feet h 12 feet 30 12 2 180 square feet.

For a shape like a triangle gables and hips trapezoid hip side with the ridge or trapezium gable roof with a valley. Remember the longer the cut the more the waste. The calculation is based on 4 x 8 sheets 32 square feet each. Divide the roof s area by 32 32 is the total area of one sheet of plywood to find this figure.

Estimate the number of sheets of plywood or osb that are needed for sheathing a hip roof. Once you have the area you can divide by the area of a sheet of plywood to find the number of sheets needed. A typical gable roof will have identical slopes on each side of the. Follow theses guidelines for a closer estimation.

How to figure out how much plywood to use on a roof. For example if your roof is 1 500 ft 2 then it will take 47 sheets of plywood to sheath it. Roof sheathing hip roof imperial calculator. Estimate the amount of plywood or osb needed for sheathing a roof.

Divide by the total square footage by the square footage of a sheet of plywood to find the number of sheets required to cover the space. 800 32 25 sheets. For example if the area to be covered in plywood is 800 ft 2 then 25 sheets of plywood will be needed to cover it. A 4 8 sheet of plywood is 32 ft 2.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. One sheet 32 ft. So dividing the area of the roof by 32 will give you the number of sheets needed. Measure the length and width in feet of each roof slope with the tape measure.

This comes out to about 94 sheets of 4 x 8 plywood. Divide the total roof area by 32 to get the number of sheets you will need to cover the roof. Then add at least four feet for waste.