Design Specifications:
Dead Load = 12 psf, Live Load = 40 psf (Residential)
Douglas Fir - Larch Framing
Deflection of L/360 maximum but never more than 1/2 inch.
| Size of Floor Joist (inches) | Spacing of Floor Joists (inches) | No.2 Douglas Fir | No.1 Douglas Fir |
| 2 x 6 | 12 | 9'-9" | 10'-0" |
| 16 | 8'-11" | 9'-1" | |
| 24 | 7'-5" | 7'-11" | |
| 2 x 8 | 12 | 12'-11" | 13'-2" |
| 16 | 11'-6" | 12'-0" | |
| 24 | 9'-4" | 10'-0" | |
| 2 x 10 | 12 | 16'-1" | 16'-4" |
| 16 | 14'-0" | 15'-0" | |
| 24 | 11'-5" | 12'-3" | |
| 2 x 12 | 12 | 18'-8" | 18'-11" |
| 16 | 16'-3" | 17'-5" | |
| 24 | 13'-3" | 14'-2" |
Design Specifications:
Dead Load = 18 psf, Live Load = 40 psf (Residential)
Douglas Fir - Larch Framing
Deflection of L/360 maximum but never more than 1/2 inch.
| Size of Floor Joist (inches) | Spacing of Floor Joists (inches) | No.2 Douglas Fir | No.1 Douglas Fir |
| 2 x 6 | 12 | 9'-5" | 9'-8" |
| 16 | 8'-7" | 8'-9" | |
| 24 | 7'-0" | 7'-6" | |
| 2 x 8 | 12 | 12'-5" | 12'-8" |
| 16 | 10'-10" | 11'-7" | |
| 24 | 8'-10" | 9'-6" | |
| 2 x 10 | 12 | 15'-4" | 15'-11" |
| 16 | 13'-2" | 14'-2" | |
| 24 | 10'-10" | 11'-7" | |
| 2 x 12 | 12 | 17'-10" | 18'-5" |
| 16 | 15'-5" | 16'-6" | |
| 24 | 12'-7" | 13'-5" |