Materials · 4 min read
Roof Pitch Explained (and Why It Affects Your Quote)
Published
Pitch is the ratio of vertical rise to twelve inches of horizontal run, and it drives more of your roofing quote than most homeowners realize.
The ranges
Below 2:12 is essentially flat and requires a membrane, not shingles. 2:12 to 4:12 is low slope and requires doubled underlayment. 4:12 to 8:12 is conventional and walkable. Above 8:12 requires roof jacks and staging, which slows everything down.
Material implications
Low slopes hold water at the laps, which is why shingles alone fail there. Porch roofs and additions are the usual low-slope areas on Miami Valley homes and are frequently the leak source.
Labor implications
A 12:12 roof can take twice as long as a 5:12 roof of identical area. That's staging, safety equipment, and the simple fact that nobody can carry a bundle up a 45-degree surface quickly.
Measuring yours
From the attic, hold a level horizontally against a rafter, mark twelve inches, and measure straight up to the rafter underside. That measurement is your rise.
If any of this applies to your own home, our asphalt shingle roofing crews handle it every week, and you can see how we work in your area on our Troy, Ohio roofing page. Inspections and written estimates are free either way — call 937-749-7767.