# How to Figure Out How Much Plywood to Use on a Roof

#### Things You'll Need

• Tape measure

• Calculator

Plywood is used in a variety of capacities to build structures.

When building a home or other structure such as a shed or pool house, you'll need to know how many materials will be needed to complete the project. If you are planning to use plywood, you'll have to get the square footage of the roof's surface and use those figures to determine how many plywood panels you will need. As with any construction project, you should add a bit extra to compensate for mistakes.

## Step 1

Measure the length of the roof area with a tape measure and record the measurement on a notepad.

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## Step 2

Extend the tape measure across the roof perpendicular to the last measurement to get the width of the roof area; write this number down as well.

## Step 3

Multiply the length by the width with a calculator to get the total square footage of the roof area. For instance, if the roof is 40 feet long and 30 feet wide, you would enter 40 x 30 into your calculator to get a total square footage of 1,200.

## Step 4

Figure the square footage of the plywood sheets. Normally, plywood comes cut in 4-foot by 8-foot sheets. Multiply 4 feet by 8 feet to get 32 square feet.