How far can a 2×10, 2×12, 2×8 & 2×6 lumber span for a pergola depends on various factors, including the type of wood, load requirements, and local building codes.

However, I can provide you with some general guidelines for common wood types like Douglas fir or Southern pine:

In general, for pergola, a 2×10 lumber can typically span up to 20 feet, while a 2×12 lumber can typically span up to 24 feet. Moreover, a 2×8 lumber can typically span up to 16 feet, while a 2×6 lumber can typically span up to 12 feet. In addition, a 2×4 lumber can typically span up to 8 feet.

A pergola is constructed to outside of main building as an outdoor garden feature that helps in forming a shaded passageway, walkway or sitting area of vertical posts or pillars or column that usually support cross-beams and a sturdy open lattice, often upon which woody vines are trained.

Pergola may be an extension of a building or serve as protection for an open terrace or a link between pavilions. A pergola is a much larger and more open structure. Normally, a pergola does not include integral seating.

They are different from green tunnels, with a green tunnel being a type of road under a canopy of trees. Pergolas are sometimes confused with “arbors,” as the terms are used interchangeably. Generally, an “arbor” is regarded as wooden bench seats with a roof, usually enclosed by lattice panels forming a framework for climbing plants.

**How far can a 2×10, 2×12, 2×8 & 2×6 span for a pergola**

Many people ask questions about the pergola beam span. It’s a real frustration when planning an open structure. There seems to be no definitive beam spans for pergolas, it depends on the many factors such as species and grade of wood and spacing, plus local codes and snow loads.

In general, for pergola, a 2×12 size of timber or wood beam can span up to 24 feet, while a 2×10 can span upto 20 feet. Moreover, a 2×8 can span upto 16 feet, while a 2×6 can span upto 12 feet. In addition a 2×4 can span upto 8 feet.

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**How far can a 2×4 span for a pergola**

The maximum span of a 2×4 lumber for a pergola need to be 5 to 8 feet. So, a typical SPF (Spruce-Pine-Fir) 2×4 can span around 5 to 8 feet for light loads in a pergola application.

**How far can span a 2×6 for a pergola**

The span of a 2×6 lumber for a pergola need to be 10 to 12 feet. So, a typical SPF (Spruce-Pine-Fir) 2×6 can span from 10 to 12 feet for minimal loads in a pergola application.

**How far can span a 2×8 for a pergola**

The span of a 2×8 lumber for a pergola need to be 12 to 16 feet. So, a typical SPF (Spruce-Pine-Fir) 2×8 can span from 12 to 16 feet for light loads in a pergola application.

**How far can span a 2×10 for a pergola**

As per thumb rule and general guidelines, for a pergola, a 2×10 (2″ by 10″) size of timber or wood beam can allow to maximum span upto 20 feet in length. Although it depends on the species and grade of wood.

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**How far can span a 2×12 for a pergola**

As per thumb rule and general guidelines, for a pergola, a 2×12 (2″ by 12″) size of timber or wood beam can allow to maximum span upto 24 feet in length. Although it depends on the species and grade of wood.

**Conclusion:**

For a pergola, a 2×6 size of timber or wood beam can allow to span maximum up to 12 feet, a 2×10 can span upto 20 feet, a 2×8 can span up to 16 feet, a 2×12 can span up to 24 feet and 2×4 can span upto 8 feet.