Plywood Sheathing Delivery for a 30×40 Gable
A sheathing haul: sheet count, waste, and pounds for a 30 by 40 ft, 6/12 roof.
Formula SSC-2026.1
6.00 / 12 · 26.57°
Pitch angle
26.57°
Multiplier 1.1180
Common rafter
17 ft 9 13/16 in
Tail 1 ft 1 7/16 in
Cuts
26.57° plumb
63.43° seat
Roof area
1,497 ft²
14.97 squares
Shingle bundles
50
3 bundles per square + 10% waste
Sheathing / felt
52 sheets
5 underlayment rolls
Delivery weight
6,032 lb
2,736 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 | 14.97 squares | 10% | 50 bundles | USD | $2,100.00 |
| 4x8 CDX sheathing | 46.8 sheets | 10% | 52 sheets | USD | $1,456.00 |
| Underlayment rolls | 1,497 ft² | overlap allowance | 5 rolls | USD | $275.00 |
| 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 | 16 ft 9 5/8 in | 14.11 | 47 | 49 |
| 6.0/12 | 26.57° | 1.118 | 17 ft 9 13/16 in | 14.97 | 50 | 52 |
| 9.0/12 | 36.87° | 1.250 | 19 ft 11 1/16 in | 16.73 | 56 | 58 |
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: Plywood Sheathing Delivery for a 30×40 Gable
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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 building is 30 ft wide and 40 ft long at 6/12 with a 1 ft overhang. Sheets are the roof area times 1.10 divided by 32 square feet, rounded up. At 46 lb per sheet the delivery line is that count times 46, plus shingle and roll weight in the combined freight note. Lift weight for one sheet is the 46 lb figure. The roof area includes both slopes and the rake overhang.
Code reference
IRC R803 covers roof sheathing thickness and span rating. This count does not select the panel span rating.
Field questions
- How many square feet are on one sheet?
- A 4x8 sheet is 32 square feet. The order adds 10 percent before rounding up.
- Does the count include both sides of the gable?
- Yes. Shed roofs use one slope. This preset is a gable.
- What panel weight is used?
- 46 lb per sheet, a planning weight for a typical CDX panel. A thicker panel weighs more.