How To Figure Plywood For A Roof

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How to figure plywood for a roof.

To accurately calculate the area of your roof you must first determine its slope or pitch. Things you will need. A 4 8 sheet of plywood is 32 ft 2. 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. This will give you the total number of sheets to buy. 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.

This basically calculates the number of sheets needed for a gable roof. Solving for the number of sheets of plywood necessary for more complicated shapes requires at least some estimating. 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. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

You should be prepared to have about 15 percent waste so multiply your figure by 1 15. One 4 by 8 foot sheet of osb or plywood is 32 square feet. Add 20 percent to that figure to allow for the roof slope which results in 1 320 square feet of roof area. To find the amount of plywood needed to cover a roof start by finding the area of the roof.

Find the area of a roof. 800 32 25 sheets. Divide 1 320 by 32 to get 41 plywood sheets. 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.

The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. Roof sheathing hip roof imperial calculator estimate the number of sheets of plywood or osb that are needed for sheathing a hip roof. Divide the roof s area by 32 32 is the total area of one sheet of plywood to find this figure. Take the roof s total square footage and divide by 32.

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. For example if your roof is 3 000 square feet divide 3 000. Follow theses guidelines for a closer estimation. For a shape like a triangle gables and hips trapezoid hip side with the ridge or trapezium gable roof with a valley.

The calculation is based on 4 x 8 sheets 32 square feet each.