Shingle Bundle Delivery Weight for a 6/12 Roof
Roofing freight: bundles at 70 lb, sheets at 46 lb, and underlayment rolls at 28 lb.
Formula SSC-2026.1
6.00 / 12 · 26.57°
Pitch angle
26.57°
Multiplier 1.1180
Common rafter
14 ft 5 9/16 in
Tail 1 ft 1 7/16 in
Cuts
26.57° plumb
63.43° seat
Roof area
1,215 ft²
12.15 squares
Shingle bundles
41
3 bundles per square + 10% waste
Sheathing / felt
42 sheets
4 underlayment rolls
Delivery weight
4,914 lb
2,229 kg · 70 lb bundles, 46 lb sheets, 28 lb rolls
Rise and run are scaled from the span, overhang, and pitch. The small triangle is the pitch ratio.
| Item | Net | Waste | Order | Unit price | Line total |
|---|---|---|---|---|---|
| Architectural shingle bundles | 12.15 squares | 10% | 41 bundles | USD | $1,722.00 |
| 4x8 CDX sheathing | 38.0 sheets | 10% | 42 sheets | USD | $1,176.00 |
| Underlayment rolls | 1,215 ft² | overlap allowance | 4 rolls | USD | $220.00 |
| Ridge cap bundles | 42.0 ft ridge | — | 2 bundles | 25 ft per bundle | — |
| Pitch | Degrees | Multiplier | Rafter | Squares | Bundles | Sheets |
|---|---|---|---|---|---|---|
| 4.0/12 | 18.43° | 1.054 | 13 ft 7 5/8 in | 11.46 | 38 | 40 |
| 6.0/12 | 26.57° | 1.118 | 14 ft 5 9/16 in | 12.15 | 41 | 42 |
| 8.0/12 | 33.69° | 1.202 | 15 ft 6 9/16 in | 13.06 | 44 | 45 |
Show the deterministic formula
Angle = arctan(rise ÷ 12). Multiplier = √(1 + (rise ÷ 12)²). Gable run = span ÷ 2 − ridge thickness ÷ 2. Rafter length = (run + horizontal overhang) × multiplier.
Plumb cut = pitch angle. Seat cut = 90° − pitch angle. Area uses both slopes on a gable and one slope on a shed, and it includes a rake overhang equal to the eave overhang.
Bundles = ceiling of squares × 3 × 1.10. Sheets = ceiling of area × 1.10 ÷ 32. Rolls use 360 ft² effective coverage. Delivery weight plans 70 lb per bundle, 46 lb per sheet, and 28 lb per roll, then the header converts that pound total at 1 lb = 0.45359237 kg.
Contractor sign-off
Project: Shingle Bundle Delivery Weight for a 6/12 Roof
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This sheet is an estimate for ordering and layout discussion. It is not a sealed design. Confirm the quantities with a licensed local professional and the authority having jurisdiction before you buy or build.
Engineering notes
The roof is the 24 by 40 ft, 6/12 gable used on the framing cluster, read here as a delivery. Bundle count is 3 per square plus 10 percent. The planning weight is 70 lb per architectural bundle, 46 lb per 4x8 sheet, and 28 lb per underlayment roll. Those weights are editable only by changing the unit prices for cost. The pound total is on the formula note and the sheet count is in the bill of materials. Confirm the bundle weight printed by the brand you buy.
Code reference
Delivery weights are planning numbers. IRC R905 still governs the roof covering installation.
Field questions
- How heavy is one bundle?
- The freight total uses 70 lb per bundle. Laminated architectural bundles are often in that range. Three-tab bundles can be lighter.
- Does the weight include the plywood?
- Yes. Sheets are counted with 10 percent waste at 46 lb each and added to the bundles and the rolls.
- How do I turn bundles into a truck load?
- Multiply is already done in the delivery-weight note inside the formula panel. Compare that total with the truck you have, and leave a margin for the pallet and the crew.