Calculate material waste factors for roofing projects. Plan overages for valleys, hips, dormers, and roof penetrations. Essential for accurate material ordering.
Roof Analysis
Waste Calculation
Base Waste %10%
Total Waste Factor15%
Base Roof Area0 sq ft
Valley Add (10% each)+0 sq ft
Hip Add (5% each)+0 sq ft
Dormer Add (25 sq ft each)+0 sq ft
Adjusted Area with Waste0 sq ft
Extra Material Cost$0
Typical Waste %
3-Tab Shingles: 10-15%
Architectural: 10-12%
Metal Roofing: 3-8%
Tile: 8-15%
Flat Roof: 5-10%
Waste Formula
Base = 10% standard
Valley = +10% per valley
Hip = +5% per hip
Dormer = +25 sq ft each
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