How to find the pitch of a roof?

When it comes to roofing, one of the most important factors that determine durability, material choice, and even curb appeal is the pitch of a roof. Whether you’re a homeowner in Marietta, GA, considering a new installation, or a contractor in Sandy Springs, GA, needing precise measurements, understanding the roof pitch is essential.

What is Roof Pitch and Why Does it Matter?

The pitch of a roof refers to its steepness, typically expressed as the ratio of vertical rise to horizontal run. For example, a 6/12 pitch means that the roof rises 6 inches for every 12 inches of horizontal distance. The pitch affects:

• Water Drainage – Steeper roofs allow water and debris to run off more efficiently.
• Material Choices – Some materials, like metal or slate, perform better on steeper slopes, while flat or low-slope roofs may require specialized membranes.
• Aesthetics – The pitch defines a home's look, from sleek modern low-pitch roofs to traditional steep designs.
• Snow Load & Weather Resistance – A high-pitch roof is beneficial in areas with heavy rainfall or snowfall.

Industry Standards & Statistics

• The most common residential roof pitches range between 4/12 and 9/12.
• Roofs below 2/12 are considered low-slope and require special materials (NRCA).
• Steeper roofs (above 8/12) tend to be more expensive due to increased labor (increased safety measures), materials and insurance.

Three Easy Ways to Find the Pitch of a Roof

You don’t need to be a roofing pro to measure the pitch of a roof. Here are three simple methods to do it yourself.

1. Measuring from the Roof’s Surface

What You Need:

• A level (at least 12 inches long)
• A tape measure

How to Do It:

1. Place the level on the roof so it extends outward, parallel to the ground.
2. Measure 12 inches along the level from the starting point.
3. At the 12-inch mark, measure vertically from the roof surface to the bottom of the level.
4. That measurement is the “rise” in inches. If it’s 6 inches, your pitch is 6/12.

2. Measuring from Inside the Attic

If climbing on the roof isn’t your thing, you can measure from the attic.

How to Do It:

1. Locate a rafter inside your attic.
2. Place a level against the underside of the rafter.
3. Mark 12 inches along the level.
4. Measure vertically from the 12-inch mark down to the rafter.
5. That number is the rise, and you now have the pitch!

3. Using a Smartphone App

Several apps can calculate the pitch of a roof using your phone’s accelerometer. Apps like Pitch Gauge or iHandy Level allow you to measure with just a tap.

How to Do It:

1. Open the app and select the “roof pitch” function.
2. Hold your phone against the roof surface or under a rafter.
3. The app will display the pitch instantly.

Converting Roof Pitch to Other Units

Sometimes, you need to convert the pitch of a roof to degrees for blueprints or construction estimates. Here’s a quick conversion:

• 4/12 pitch = 18.4°
• 6/12 pitch = 26.6°
• 8/12 pitch = 33.7°

Formula: Degrees = arctan(rise/run)

Choosing the Right Roofing Material Based on Pitch

Not all roofing materials work for every pitch. Here’s a general guide:

Pitch Range	Best Roofing Material
1/12 – 2/12	TPO, EPDM, Modified Bitumen
3/12 – 5/12	Asphalt Shingles, Metal, Roll Roofing
6/12 – 9/12	Asphalt Shingles, Metal, Slate
10/12+	Slate, Tile, Metal

In areas like Kennesaw, GA, where weather conditions fluctuate, choosing the right material based on the pitch of a roof is crucial.

Common Mistakes When Measuring Roof Pitch

Even seasoned contractors can make mistakes. Here’s what to avoid:

• Measuring at an angle – Always measure perpendicular to the roofline.
• Using a short level – A 12-inch or longer level ensures accuracy.
• Forgetting about roof layers – If your roof has multiple layers of shingles, the extra height can slightly alter measurements.

Personal Story: Learning the Hard Way

I once had a homeowner in Marietta, GA call me in a panic. They had ordered roofing materials for a 4/12 pitch based on an online guess. When our team from Georgia Roof Advisors arrived, we found out their actual pitch was 7/12. That mistake cost them an extra two weeks in material reorders! Lesson learned: always measure or consult a professional.

Final Thoughts

Finding the pitch of a roof is an essential skill, whether you're planning a repair, installing new shingles, or calculating drainage. With the right tools and methods, you can easily measure your roof’s pitch and make informed decisions about materials and costs.

If you're unsure about your roof pitch or need expert assistance, Georgia Roof Advisors is here to help. Whether you’re in Marietta, GA, Cobb County, or beyond, our roofing professionals are just a call away!

Need help with your roof? Contact Georgia Roof Advisors today!

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FAQ: How to Find the Pitch of a Roof

1. What is the pitch of a roof?

The pitch of a roof refers to how steep the roof is. It is usually expressed as a ratio of rise over run, such as 6/12, meaning the roof rises 6 inches for every 12 inches of horizontal distance.

2. Why is knowing the roof pitch important?

Knowing the pitch of a roof is important because it affects water drainage, roofing material selection, installation costs, weather resistance, and the overall appearance of the home.

3. How can I measure the pitch of a roof myself?

You can measure the pitch of a roof using a level and tape measure from the roof surface, from inside the attic using a rafter, or by using a smartphone roof pitch app.

4. What tools do I need to find the pitch of a roof?

To measure roof pitch manually, you typically need:

• A 12-inch level
• A tape measure
• A pencil or marker
• A smartphone app (optional)

5. What is considered a steep roof pitch?

A roof pitch above 8/12 is generally considered steep. Steeper roofs often require additional safety precautions during installation and maintenance.

6. Can I measure roof pitch from inside the attic?

Yes. Measuring from the attic is one of the safest ways to find the pitch of a roof. You can measure the rise using the underside of a rafter and a level without climbing onto the roof.

7. What roofing materials work best for different roof pitches?

Low-slope roofs often use TPO or EPDM membranes, while medium and steep roofs commonly use asphalt shingles, metal roofing, slate, or tile depending on the pitch.

8. How do I convert roof pitch to degrees?

You can convert the pitch of a roof to degrees using a roofing calculator or the formula:
$\theta = \arctan\left(\frac{\text{rise}}{\text{run}}\right)$θ=arctan(runrise)

For example:

• 4/12 pitch = 18.4°
• 6/12 pitch = 26.6°
• 8/12 pitch = 33.7°

9. What are common mistakes when measuring roof pitch?

Common mistakes include:

• Measuring at the wrong angle
• Using a level that is too short
• Ignoring extra roofing layers
• Guessing instead of taking exact measurements

10. Should I hire a professional to measure my roof pitch?

If you are uncomfortable climbing onto a roof or need precise measurements for a roofing project, hiring a professional roofing contractor like Georgia Roof Advisors is the safest and most accurate option.