How To Figure Plywood For A Roof

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.

How to figure plywood for a roof.

A 4 8 sheet of plywood is 32 ft 2. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed. A 12 in 12 pitch is a.

Follow theses guidelines for a closer estimation. Take the roof s total square footage and divide by 32. To accurately calculate the area of your roof you must first determine its slope or pitch. Calculate how many sheets of plywood are needed.

You should be prepared to have about 15 percent waste so multiply your figure by 1 15. The calculation is based on 4 x 8 sheets 32 square feet each. For example if your roof is 3 000 square feet divide 3 000. Find the average length by measuring at the center of.

800 32 25 sheets. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. Solving for the number of sheets of plywood necessary for more complicated shapes requires at least some estimating. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

To find the amount of plywood needed to cover a roof start by finding the area of the roof. Roof sheathing hip roof imperial calculator estimate the number of sheets of plywood or osb that are needed for sheathing a hip roof. This will give you the total number of sheets to buy. Divide the roof s area by 32 32 is the total area of one sheet of plywood to find this figure.

Add 20 percent to that figure to allow for the roof slope which results in 1 320 square feet of roof area. This basically calculates the number of sheets needed for a gable roof. One 4 by 8 foot sheet of osb or plywood is 32 square feet. For a shape like a triangle gables and hips trapezoid hip side with the ridge or trapezium gable roof with a valley.

The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements. Things you will need. 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. Find the area of a roof.

Divide 1 320 by 32 to get 41 plywood sheets.