Calculate how much material to order including waste. Select your material type for industry-standard waste factors.
| Material | Waste Factor | Notes |
|---|---|---|
| Lumber / Framing | 5-10% | Higher for complex layouts |
| Drywall | 10-12% | More waste on small rooms |
| Roofing Shingles | 10-15% | 15%+ for hip roofs |
| Concrete | 5-8% | Over-order slightly for pumped concrete |
| Tile (floor) | 10-15% | Diagonal layouts = more waste |
| Carpet | 8-12% | Depends on room shape and seaming |
| Paint | 10-15% | Extra for touch-ups and coverage |
| Insulation | 5-8% | Batts vs blown-in differs |
| Siding (vinyl) | 10-12% | More for complex facades |
| Ductwork | 8-12% | Fittings add to waste |
A waste factor is the percentage of extra material you need to order beyond your net measurement to account for cutting, breakage, damage, and overlap. For example, a 10% waste factor on 1,000 sq ft of drywall means ordering 1,100 sq ft.
Standard waste percentages vary by material: lumber 5-10%, drywall 10-12%, roofing shingles 10-15% (more for complex roofs), concrete 5-8%, tile 10-15%, carpet 8-12%, and paint 10-15%.
Reduce waste by: (1) accurate takeoffs and measurements, (2) ordering standard sizes that minimize cuts, (3) proper storage to prevent damage, (4) planning cut layouts, and (5) using waste calculators to order the right quantity.
Build accurate material quantities into every estimate.
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