A 3/12 roof pitch can also be expressed as 3 over 12 and when you're talking to a roofer, this is the most common way you'll hear it explained because it's easy to say in conversation.
Other ways to express a 3/12 pitch is "3 and 12" or "3:12".
In this pitch, the three is your roof's rise and the twelve is the roof's run.
The roof's incline increases four feet for every 12 feet of horizontal measurement.
3/12 Roof Pitch Calculator (Visualize Similar With Rise Of 3)
What angle is a 3 over 12 pitch?
Roofs with a pitch of 3/12 are approximately 14.04 degrees, depending on how exact you'd like to be in your measurement.
Check out our roof angle chart for more examples of the exact angles (expressed in degrees) of common roof pitches.
What is the pitch factor of a 3/12 pitched roof?
The pitch factor is 1.03 for a 3/12 roofing pitch.
Installation & Maintenance Factors
Roofs with a 3/12 pitch are generally easier and less expensive to install due to their lower slope. They're faster to install because walking on a roof a lower angle like this is easier.
While a 3/12 pitch is usually adequate for draining water, it's not as efficient as steeper pitches like a 10 over 12. Roofs with a rise of 3 and run of 12 may require more maintenance to prevent water pooling or leakage.
Style & Architecture
How a 3/12 pitch to your roof affects your home's style is a consideration if you're building a new home. This pitch is often seen in the design of both modern and minimalist homes because it gives a subtle sloped appearance. This subtle slope can be aesthetically pleasing for certain architectural styles that call for minimalism.
How steep is a 3:12 roof pitch?
Compared to other roof slopes, a 3/12 roof pitch isn't very steep. It's fairly close to being considered low slow, but is right on the line of still being a "pitched" roof where you would use asphalt shingles or another roof material like metal roofing for replacement.
Can I safely walk a 3/12 pitched roof?
Yes, most people can safely walk a 3 over 12 roof, but it really depends on your physical abilities. For safety reasons, we recommend leaving roofing to the professionals and staying off your roof. This is not advice to hop up on your roof!
But in terms of walking comfort, research shows inclines under 10 degrees are viewed as relatively flat by most people. AA 3:12 pitch has 14 degree angle, so this means it is on the line of being "very easy" but should still be quite easy.
If someone held a protractor level to view the angle, a 3/12 roof slope would appear closer to horizontal than to 45 degrees. 45 degrees is close to the maximum roofing angle recommended for working without safety harnesses.