Pressure Treated Deck Joist Span Charts - Outdoor Lumber Tables
Pressure treated lumber span charts designed for outdoor deck construction. These charts cover 2x4, 2x6, 2x8, 2x10, and 2x12 treated lumber sizes to help you build decks that last in outdoor conditions.
Pressure Treated Specs:
- Maximum spans for treated lumber (2x4, 2x6, 2x8, 2x10, 2x12)
- Load tables for outdoor use
- Weather-resistant lumber data
- Moisture content factors for treated wood
Perfect for outdoor deck projects - these charts help you choose the right treated lumber sizes while meeting safety standards and building codes.
Technical Notes: Incised lumber is pressure treated wood with small cuts that help preservatives penetrate deeper, which reduces strength slightly (factor of 0.95). Wet service conditions apply to lumber used outdoors where moisture content exceeds 19%.
Customize Input
Southern Pine Joist and rafters span table based on Dead Load: 10 psf Live Load: 40 psf and deflection limit of L/360
Max span calculations have been based on this RedX Apps Span Calculator.
| Southern Pine Joist and Rafters Max Span Table | |||||
|---|---|---|---|---|---|
| Lumber Grade | Nominal Size | Spacing O.C. | |||
| 12 in | 16 in | 19.2 in | 24 in | ||
| loading... | |||||
Douglas Fir Joist and rafters span table based on Dead Load: 10 psf Live Load: 40 psf and deflection limit of L/360
Max span calculations have been based on this RedX Apps Span Calculator.
| Douglas Fir Joist and Rafters Max Span Table | |||||
|---|---|---|---|---|---|
| Lumber Grade | Nominal Size | Spacing O.C. | |||
| 12 in | 16 in | 19.2 in | 24 in | ||
| loading... | |||||
Hem-fir Joist and rafters span table based on Dead Load: 10 psf Live Load: 40 psf and deflection limit of L/360
Max span calculations have been based on this RedX Apps Span Calculator.
| Hem-fir Joist and Rafters Max Span Table | |||||
|---|---|---|---|---|---|
| Lumber Grade | Nominal Size | Spacing O.C. | |||
| 12 in | 16 in | 19.2 in | 24 in | ||
| loading... | |||||
Spruce-pine-fir Joist and rafters span table based on Dead Load: 10 psf Live Load: 40 psf and deflection limit of L/360
Max span calculations have been based on this RedX Apps Span Calculator.
| Spruce-pine-fir Joist and Rafters Max Span Table | |||||
|---|---|---|---|---|---|
| Lumber Grade | Nominal Size | Spacing O.C. | |||
| 12 in | 16 in | 19.2 in | 24 in | ||
| loading... | |||||
Disclaimer:
While every effort has been made to insure the accuracy of the information presented, and special effort has been made to assure that the information reflects the state-of-the-art, RedX Technology nor its members assume any responsibility for any particular design prepared from this Span Calculator. Those using this Span Calculator assume all liability from its use.