Headers shall be provided over each opening in interior bearing partitions as required in Section 2308.9.5. The spans in Table 2308.9.6 are permitted to be used. Wall studs shall support the ends of the header in accordance with Table 2308.9.5 or 2308.9.6, as appropriate.
TABLE 2308.9.6
HEADER AND GIRDER SPANSa FOR INTERIOR BEARING WALLS
(Maximum Spans for Douglas Fir-Larch, Hem-Fir, Southern Pine and Spruce-Pine-Firb and Required Number of Jack Studs)
| HEADERS AND GIRDERS SUPPORTING | SIZE | BUILDING widthc (feet) | |||||
| 20 | 28 | 36 | |||||
| Span | NJd | Span | NJd | Span | NJd | ||
| One Floor Only | 2-2×4 | 3-1 | 1 | 2-8 | 1 | 2-5 | 1 |
| 2-2×6 | 4-6 | 1 | 3-11 | 1 | 3-6 | 1 | |
| 2-2×8 | 5-9 | 1 | 5-0 | 2 | 4-5 | 2 | |
| 2-2×10 | 7-0 | 2 | 6-1 | 2 | 5-5 | 2 | |
| 2-2×12 | 8-1 | 2 | 7-0 | 2 | 6-3 | 2 | |
| 3-2×8 | 7-2 | 1 | 6-3 | 1 | 5-7 | 2 | |
| 3-2×10 | 8-9 | 1 | 7-7 | 2 | 6-9 | 2 | |
| 3-2×12 | 10-2 | 2 | 8-10 | 2 | 7-10 | 2 | |
| 4-2×8 | 9-0 | 1 | 7-8 | 1 | 6-9 | 1 | |
| 4-2×10 | 10-1 | 1 | 8-9 | 1 | 7-10 | 2 | |
| 4-2×12 | 11-9 | 1 | 10-2 | 2 | 9-1 | 2 | |
| Two Floors | 2-2×4 | 2-2 | 1 | 1-10 | 1 | 1-7 | 1 |
| 2-2×6 | 3-2 | 2 | 2-9 | 2 | 2-5 | 2 | |
| 2-2×8 | 4-1 | 2 | 3-6 | 2 | 3-2 | 2 | |
| 2-2×10 | 4-11 | 2 | 4-3 | 2 | 3-10 | 3 | |
| 2-2×12 | 5-9 | 2 | 5-0 | 3 | 4-5 | 3 | |
| 3-2×8 | 5-1 | 2 | 4-5 | 2 | 3-11 | 2 | |
| 3-2×10 | 6-2 | 2 | 5-4 | 2 | 4-10 | 2 | |
| 3-2×12 | 7-2 | 2 | 6-3 | 2 | 5-7 | 3 | |
| 4-2×8 | 6-1 | 1 | 5-3 | 2 | 4-8 | 2 | |
| 4-2×10 | 7-2 | 2 | 6-2 | 2 | 5-6 | 2 | |
| 4-2×12 | 8-4 | 2 | 7-2 | 2 | 6-5 | 2 | |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
- Spans are given in feet and inches (ft-in).
- Tabulated values are for No. 2 grade lumber.
- Building width is measured perpendicular to the ridge. For widths between those shown, spans are permitted to be interpolated.
- NJ - Number of jack studs required to support each end. Where the number of required jack studs equals one, the headers are permitted to be supported by an approved framing anchor attached to the full-height wall stud and to the header.