Roof Valley Calculator
Calculate roof valley dimensions, angles, and materials. Understand how roof pitch, valley length, and building dimensions affect your roofing project.
Step 1: Roof Dimensions
Understanding Roof Pitch
Roof pitch is expressed as a ratio of vertical rise to horizontal run. A 6:12 pitch means 6 inches of rise for every 12 inches of run. Steeper pitches affect valley length and material requirements.
Step 2: Materials & Cost
About Valley Types
Open valleys have metal lining exposed between shingles. Closed valleys are covered with shingles. Woven valleys interlace shingles from both sides. California valleys use shingles from one side only.
Roof Valley Calculation Results
Estimated Total Valley Length
Material Cost Comparison
| Material Type | Cost per ft | Total Cost | Durability | Installation |
|---|
Cost Breakdown Analysis
Valley Length Formula
Valley Length = √(Length² + Width²) × Pitch Factor
The valley length is calculated using the Pythagorean theorem adjusted for roof pitch. Higher pitches increase the actual valley length compared to the horizontal measurement.
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