Here's a step-by-step guide to measuring with blueprints

Best Roof Measurement In Virginia

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How To Measure A Roof
  • Step 1: How to Calculate Your Roof Square Footage. First, measure the length and width of each surface on the roof, then multiply these values to get the square footage of that surface. …
  • Step 2: How to Determine Your Roof Pitch. …
  • Step 3: Calculating Roof Squares.

How do I calculate the size of my roof?

Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.) Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)

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Square Footage

  1. The first thing you’ll need to measure is the square footage of your roof.
  2. Position your ladder at the corner of one of your roof planes to determine the length.
  3. Extend your measuring tape as far as you can along the length of your roof and mark the area.
  4. Move your ladder down to the next section. Beginning with where you marked the first measurement, measure the next section.
  5. Continue measuring the length of your roof until you’ve covered the entire length area.
  6. Write down the final measurement.
  7. Next, you’ll want to measure the width of your roof plane. (Depending on how high your roof is, you may want to be up on it to take this measurement.)
  8. Use your ladder or your feet to measure the entire width of your roof plane.
  9. Write down the final measurement.
  10. Continue steps 1-9 on each of your roof’s planes.
  11. Multiply the length and width of each plane to get the square footage. Then, add all of your square footage measurements together to get the total square footage of your roof.

Slope

  1. You’ll also need to measure the slope, or angle, of your roof.
  2. To do this, position your ladder near the top point of your roof.
  3. With your measuring tape, measure vertically from the top point to the bottom point of your roof. (This is also called the rise.)
  4. Repeat this over 12 inches, then place the measurement over “12”. (For example: If your rise is 4 inches over 12 inches, then your slope measurement is 4/12.)

Measuring a Roof from the Ground

If you do not feel comfortable climbing onto your roof to take measurements, you can calculate the square footage from the ground. However, know that your measurements will be an estimate and less precise than a on-the-roof measurement. Measuring from the ground usually only works for square or rectangular roofs. If you have an irregular-shaped roof, you will need to measure from the top.

To measure your roof from the ground, use your tape measure to find the length and the width of the home by stretching the tape measure along the exterior walls. If your roof has overhangs, eyeball them and add the approximate length to your measurements.
To estimate the pitch of the roof, go into your attic equipped with a tape measure, pencil, and 18- or 24-inch level. Start by measuring 12 inches from one end of the level and make a mark. Once in the attic, place the level against the bottom of a roof rafter.

Measure vertically from the 12-inch mark to the underside of a rafter. That measurement is the number of inches that your roof rises in 12 inches.

Once you have determined the estimated square footage of your roof, you can proceed in the same way as the first method. This involves dividing your estimate square footage by 100 to determine the amount of materials you will need for your roofing project.

When purchasing materials for your roof, it is a good idea to always buy at least 10 percent more materials than you think you will need to prevent coming up short. Remember, you can always return the materials you do not use to the store.