What is a typical roof pitch?
How pitch is written
Pitch is rise over run: a 6/12 roof climbs 6 inches for every 12 inches of horizontal distance. Roofers say "six twelve" or "a six pitch." Below about 4/12 is low slope for shingles, and above about 8/12 a roof starts to feel steep underfoot.
Typical ranges by house style
- Ranch homes from the postwar decades: often 4/12 to 6/12, easy to walk.
- Split levels and simple two-story colonials: commonly 6/12 to 8/12.
- Newer subdivision homes in Forsyth, Cherokee, Gwinnett and north Fulton: frequently 8/12 to 12/12, with decorative gables that are steeper still.
- Porches and additions: often 3/12 or 4/12 so they fit under upper windows.
Why the number matters to you
Pitch changes how much roof you actually have. A 6/12 roof has about 12 percent more surface than its flat footprint, and a 12/12 roof has about 41 percent more. Steeper roofs also need roof jacks and fall protection, take longer, and usually carry a steep charge on estimates once they pass about 7/12. That is one reason two houses with the same square footage can have very different prices, as our Georgia roof cost guide explains.
Typical is not the same as required
Shingles can go on anything from 2/12 up, with extra underlayment below 4/12. Steeper roofs shed water and debris faster and tend to age a little more slowly, but they cost more to build and to reroof. Your pitch was set by the house design, and most homes mix several pitches. How roofers measure a roof walks through the math they use for each section.