Shingle coverage chart
Squares, bundles and nails for a simple gable roof, by footprint, at a 6/12 pitch. Three bundles to a square, whoever makes them.
| Footprint | Roof area | Squares | Bundles | Underlayment rolls | Nails |
|---|---|---|---|---|---|
| 20' × 30' | 787 ft² | 8.7 | 26 | 1 | 8320 |
| 24' × 36' | 1105 ft² | 12.2 | 37 | 2 | 11840 |
| 28' × 40' | 1409 ft² | 15.5 | 47 | 2 | 15040 |
| 30' × 50' | 1860 ft² | 20.5 | 62 | 3 | 19840 |
| 36' × 60' | 2634 ft² | 29.0 | 87 | 3 | 27840 |
| 40' × 60' | 2911 ft² | 32.0 | 97 | 4 | 31040 |
Reading it
- A square is 100 ft² of roof and takes 3 bundles of standard three-tab or architectural shingles. That ratio holds across makers.
- These include a 10% waste allowance and a 12" overhang on every side, for a plain gable. Hips, valleys and dormers all cut more, so a complicated roof wants 15% or more.
- Starter course and ridge cap are extra and are not in these figures. Both are usually bought as their own product.
For the case this table does not cover
- Roofing calculator
Squares, bundles, starter strip, ridge cap and underlayment from a building footprint and a pitch.
- Rafters
Common, hip and jack rafters for any pitch, with the birdsmouth laid out and the cut angles alongside.