Dimensions at a glance
| Item | Common value |
|---|---|
| Spacing | 16 in or 24 in on center |
| Chord lumber | 2×4 or 2×6 |
| Overhang | 12 to 24 in |
| Residential pitch | 4/12 to 8/12 |
| Roof live load | 20 psf |
| Dead load | 10 to 15 psf |
Related calculators
Read truss design principles for why these numbers matter.