What is Roof Pitch?
Roof pitch calculation helps determine the steepness of a roof, crucial for selecting proper roofing materials, estimating construction costs, and ensuring structural integrity. Knowing your roof's pitch ratio (like 4:12) helps in weatherproofing, drainage planning, and meeting building code requirements.
Calculate Your Roof Pitch
Roof Pitch Formula
Pitch = Rise ÷ Run (Converted to X:12 ratio)
Example: 6" rise / 12" run = 6:12 pitch
Roof Pitch Chart
| Pitch Ratio | Angle | Roof Type |
|---|---|---|
| 1:12 | 4.76° | Flat Roof |
| 4:12 | 18.43° | Low Slope |
| 6:12 | 26.57° | Conventional |
| 12:12 | 45° | Steep Slope |
Advantages & Disadvantages
Advantages:
- Better water drainage prevents leaks
- Improved snow shedding in cold climates
- Enhanced architectural appeal
Disadvantages:
- Steeper roofs cost more to construct
- Increased maintenance difficulty
- Higher wind load exposure
FAQs
What's the minimum roof pitch for shingles?
Most asphalt shingles require minimum 2:12 pitch. Lower slopes need special underlayment.