How To Figure Plywood For A Roof

To find the amount of plywood needed to cover a roof start by finding the area of the roof.

How to figure plywood for a roof.

Things you will need. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet. A 4 8 sheet of plywood is 32 ft 2. To accurately calculate the area of your roof you must first determine its slope or pitch.

Take the roof s total square footage and divide by 32. You should be prepared to have about 15 percent waste so multiply your figure by 1 15. For a shape like a triangle gables and hips trapezoid hip side with the ridge or trapezium gable roof with a valley. This will give you the total number of sheets to buy.

Add 20 percent to that figure to allow for the roof slope which results in 1 320 square feet of roof area. For example if your roof is 3 000 square feet divide 3 000. Follow theses guidelines for a closer estimation. 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. Find the average length by measuring at the center of. Find the area of a roof. Calculate how many sheets of plywood are needed.

The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements. Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed. If you know you ll be using 4 foot by 8 foot sheets of plywood use the total roof area to find the set number of sheets you ll need. Solving for the number of sheets of plywood necessary for more complicated shapes requires at least some estimating.

The calculation is based on 4 x 8 sheets 32 square feet each. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Divide 1 320 by 32 to get 41 plywood sheets. This basically calculates the number of sheets needed for a gable roof.

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 12 in 12 pitch is a. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. One sheet 32 ft.

One 4 by 8 foot sheet of osb or plywood is 32 square feet.