Roofing Tear-Off Dumpster Sizing: Estimating Weight for 3-Tab & Architectural Shingles

## Roofing Waste Calculations for Central Alabama Contractors When severe summer thunderstorms or hail sweep through Montgomery and Autauga County, roofing contractors work around the clock. Getting the dumpster sizing right is critical for project profitability. ### Calculating Shingle Weight by the 'Square' In roofing, 1 'square' equals 100 square feet of roof surface. - **3-Tab Asphalt Shingles**: Weigh approximately **200 to 250 lbs per square** (single layer). - **Architectural / Dimensional Shingles**: Weigh approximately **300 to 400 lbs per square** (single layer). - **Double Layer Tear-Offs**: If an existing roof has two layers, multiply total square footage weight by two, plus approximately 15% for nails, tar paper, and damaged plywood decking. ### Sizing Matrix for Shingle Jobs - **Up to 20 Squares (Single Layer)**: A **10-Yard Dumpster** (2.0 ton allowance) is often sufficient for small ranches or detached garages. - **20 to 35 Squares (Architectural)**: A **15-Yard or 20-Yard Dumpster** (2.5 to 3.5 tons) provides ample cubic volume and weight limit for typical suburban homes. - **35 to 50+ Squares or Multi-Layer**: Rent a **20-Yard Dumpster** or arrange multiple scheduled swap-outs to remain within safe road transport limits.