How To Figure Plywood For A Roof

Calculate how many sheets of plywood are needed.

How to figure plywood for a roof.

One sheet 32 ft. Add 20 percent to that figure to allow for the roof slope which results in 1 320 square feet of roof area. Find the area of a roof. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size.

Divide 1 320 by 32 to get 41 plywood sheets. Divide the roof s area by 32 32 is the total area of one sheet of plywood to find this figure. The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements. For example if your roof is 3 000 square feet divide 3 000.

Things you will need. To accurately calculate the area of your roof you must first determine its slope or pitch. You should be prepared to have about 15 percent waste so multiply your figure by 1 15. Find the average length by measuring at the center of.

To find the amount of plywood needed to cover a roof start by finding the area of the roof. 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. 800 32 25 sheets. Solving for the number of sheets of plywood necessary for more complicated shapes requires at least some estimating.

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. 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. Follow theses guidelines for a closer estimation. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

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. The calculation is based on 4 x 8 sheets 32 square feet each. Roof sheathing hip roof imperial calculator estimate the number of sheets of plywood or osb that are needed for sheathing a hip roof.

Take the roof s total square footage and divide by 32. 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. A 12 in 12 pitch is a.

A 4 8 sheet of plywood is 32 ft 2.