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Roof Measurement Report for RESIDENTIAL Roofs

For a 1800 square foot house, you will need approximately 23 squares or 69 bundles or 2000 pieces of 3-tab standard-sized shingles (12 inch by 36 inch) when overhangs is 1 feet and roof slope is 4/12.
 
A roofing square is equal to 100 feet on your roof. If your roof measures at 1800 square feet, you would need 18 squares of shingles to cover your roof.
With that said, on average, most roofing companies will charge somewhere between $3.50 and $5.50 per square foot, or $350 to $550 per square (100 square feet) to install or replace an asphalt shingle roof.
 
Multiply the product by the flat roof area and divide by 100:- our 12×16 shed square footage with overhangs is 252 sq ft, so 1.118 x 252 = 282 square feet, 282 / 100 = 2.82 squares. Round this number up and thats your answer, 3 squares!

How to Manually Measure a Roof

To manually measure a roof without the help of aerial measurement reports, you must visit a job site and climb onto the roof to take precise roofing measurements by hand. Here are the 6 steps to get a manual roofing measurement.

 
  1. Measure the width and length of each plane of the roof (including dormers), and then multiply those numbers to get the correct figure for the square footage of that area.
    Example: Plane 1 (A x B): 50’ x 20’ = 1000 sq ft
    Plane 2 (A x C): 50’ x 20’ = 1000 sq ft
  2. Note any skylights, chimneys or other parts of the roof that would not require materials. You can subtract those measurements from your total area.
  3. Add together the calculated square footage of each surface to get the figure for total square footage of the roof.
    Example: Plane 1 (1000 sq ft) + Plane 2 (1000 sq ft) = 2000 sq ft
Diagram of roof planes to calculate square footage.
  1. After determining the total square footage of the roof, you must calculate the pitch of the roof. Measure the vertical distance (rise) over a 12 inch horizontal segment (run).
    Example: The rise of this roof is 5”.
  2. Write down these numbers as the vertical measurement listed first and the horizontal measurement recorded second so you can find rise over run.
    Example: The rise over run of this roof is 5” over 12”.
  3. When you have the total square footage and rise over run of the roof, you can calculate the roof squares to determine how much materials are needed to cover the roof. To calculate the number of squares on a roof, you need to divide its total square feet by 100.
    Example: 1000 sq ft / 100 = 10 squares

With those roofing measurement figures, you can then estimate the roofing supplies needed for a job.

Our  Roof Measurement Technologies produces roof charts wherein we take most extreme consideration of the multitude of subtleties like deterrents on roofs, accurate pitch estimation by seeing various appearances on Aerial Photos (East, West, North, and South) additionally lengths of the Eaves, hips, valleys, rakes, overhang, the space of every aspect and absolute space of the roof. Additionally, significance is given while appointing line ID as this is pivotal in planning roof outlines. For setting up the roof graphs we just need the location of the structure and we can give you the roof outline of the structure with definite precision. The estimations are taken from satellite and ethereal pictures that are regularly as, or more precise, than estimations taken from the site. We are comfortable working with Google Earth, BING, and Pictometry picture sources. Our twofold check quality methodology helps us giving quality yield to our clients.

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

Best Roof Measurement In Virginia

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.