Roofing Dumpster Calculator
1,341.64 sq ft of roof
13.42 squares (roof area 1341.64 sf = footprint × 1.12 slope factor); 1475.8 sf with 10% waste.
Tear-off debris: ≈ 2,684-3,355 lb (1.3-1.7 tons) at 1 layer, using a 200-250 lb/square/layer hauler band; confirm your dumpster's rated tonnage.
- Sloped area = footprint × √(1+(rise/12)²) = 1200 × 1.12. Pure geometry: include eave/rake overhangs in your footprint or this understates.
- Waste: 10% for simple gable (JLC convention). Waste is a range by design; cut-up roofs can exceed 15%.
- Footprint estimation fails on complex plans (dormers, turrets, intersecting gables); measure each roof plane there instead.
- A 4/12-vs-8/12 pitch mistake is a 14% area error: verify pitch, don't guess it.
Why This One Is Different
Order the wrong dumpster and you don't get an error message. You get an overage fee when the hauler weighs the load at the transfer station, because roofing debris is weight-limited, not just volume-limited. Tear-off shingles run in the neighborhood of 200-250 lb per square per layer (heavier for architectural, lighter for 3-tab, and it climbs fast with a second layer), so a single-layer 20-square tear-off can weigh two tons before anything else goes in. This calculator gets your roof's square count right first, footprint times the pitch slope factor, then walks the weight math so you can match it to a dumpster's rated capacity, not just its cubic yards.
Where the Numbers Come From
- Your roof's square count is what scales the debris weight below, and it starts with slope, not footprint: sloped roof area = footprint × √(1+(rise/12)²); squares = area ÷ 100. Source: slope-factor geometry, verified against Roof Online pitch-factor table / JLC Asphalt Shingles Field Guide
- Tear-off shingle debris runs roughly 200-250 lb per square per layer (3-tab lighter, architectural heavier); a two-layer tear-off roughly doubles it. This is a trade band, not a manufacturer spec. Confirm the actual weight limit with your hauler before ordering the bin. Source: worked example, trade band; confirm with hauler (no manufacturer/association weight table located)
- Waste percentage (10% simple, 15%+ cut-up) applies to the material order, not the tear-off weight: debris weight scales with existing roof area and layer count, not with the new shingle purchase. Source: JLC, Asphalt Shingles Field Guide (trade convention)
- Worked example: 22 squares × 1 layer × 225 lb/square (midpoint) ≈ 4,950 lb, near a typical 10-yard bin's rated weight limit, which is why layer count matters more than roof size alone. Source: worked example, closed-form arithmetic
More Questions
Can I put roofing shingles in a regular dumpster?
Usually yes for volume, but shingles are dense: a standard-size bin can hit its weight limit long before it looks full. Ask the hauler for the rated tonnage, not just the cubic-yard size, before you commit to a bin.
Related Calculators
Formulas, waste factors, and cost models on this page follow the sourced conventions on our methodology page. Estimates only; verify with your supplier and local code.