How To Figure Plywood For A Roof

The square footage of a hip roof area is identical to the square footage of a gable roof of the same measurements.

How to figure plywood for a roof.

Roof sheathing hip roof imperial calculator estimate the number of sheets of plywood or osb that are needed for sheathing a hip roof. Add 20 percent to that figure to allow for the roof slope which results in 1 320 square feet of roof area. Follow theses guidelines for a closer estimation. Solving for the number of sheets of plywood necessary for more complicated shapes requires at least some estimating.

This will give you the total number of sheets to buy. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. One 4 by 8 foot sheet of osb or plywood is 32 square feet. Things you will need.

Divide the roof s area by 32 32 is the total area of one sheet of plywood to find this figure. Find the area of a roof. For example if your roof is 3 000 square feet divide 3 000. For a shape like a triangle gables and hips trapezoid hip side with the ridge or trapezium gable roof with a valley.

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. Divide 1 320 by 32 to get 41 plywood sheets. Find the average length by measuring at the center of.

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

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. The calculation is based on that the plywood or osb oriented strand board sheets are of a 4 x 8 size. 800 32 25 sheets. 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.

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. 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. This basically calculates the number of sheets needed for a gable roof.

Calculate how many sheets of plywood are needed.