how far can you span a 2×8

The maximum span for a 2×8 beam depends on several factors, including:

1. Load: The weight and type of load the beam will be supporting (e.g., roof, floor, wall).
2. Species and grade: The type and quality of the wood (e.g., Douglas fir, southern pine, pressure-treated).
3. Orientation: Whether the beam is installed horizontally (e.g., floor joist) or vertically (e.g., wall stud).
4. Support: The type and spacing of supporting members (e.g., posts, footings).

Here are some general guidelines for maximum spans for 2×8 beams:

Floor Joists:

• For a 2×8 floor joist, the maximum span is typically around 12-14 feet (3.6-4.3 meters) for a 40 psf (pounds per square foot) live load and 10 psf dead load.
• For a 2×8 floor joist with a 60 psf live load and 10 psf dead load, the maximum span is around 10-12 feet (3-3.6 meters).

Rafters:

• For a 2×8 rafter, the maximum span is typically around 14-16 feet (4.3-4.9 meters) for a 30 psf live load and 10 psf dead load.
• For a 2×8 rafter with a 40 psf live load and 10 psf dead load, the maximum span is around 12-14 feet (3.6-4.3 meters).

Headers:

• For a 2×8 header, the maximum span is typically around 8-10 feet (2.4-3 meters) for a 40 psf live load and 10 psf dead load.

Beams:

• For a 2×8 beam, the maximum span is typically around 10-12 feet (3-3.6 meters) for a 40 psf live load and 10 psf dead load.

Keep in mind that these are general guidelines and may vary depending on local building codes, regulations, and specific design requirements. It’s always best to consult with a structural engineer or a qualified building professional to determine the maximum span for a specific 2×8 beam in your project.