## How far can a 2×6 rafter span?

2-grade 2×6 joists can span up to 10 feet 9 inches from beam to beam when spaced the standard 16 inches apart with a maximum live load of 30 inches per square foot.

**What is the maximum span for a 2×4 rafter?**

A 2×4 can span a maximum of 6′ 7” when spaced 16” apart and used as a floor or deck joist. When used as a ceiling joist or a roof rafter, a 2×4 can span up to 7′ 3” spaced at 16”, and 6′ 4” when spaced 24” apart.

**What size rafters do I need for a 18 foot span?**

Rafter size for 18 foot span:- as per general rules and guidelines, rafter made of pine wood, for a 18 foot span, size of rafter should be 2″×10″ in which thickness of rafter is 2″ and their depth range is 10 inches.

### What size lumber is used for rafters?

You can use either 2×6 or 2×4 rafters for roofs with a 3/12 pitch or greater, but it depends on the overall size of your shed. For roofs that won’t experience heavy snow loads, a gable roof can span up to 22′ with 2×4 rafters.

**What is the standard spacing of a roof rafter 2×6?**

The table states that 2 X 6 rafters spaced 16 inches on center (o.c) can span a maximum distance of 13 feet 5 inches. Another option are 2 X 8 rafters spaced 24 inches o.c.

**How to determine pergola rafter spacing?**

Plan Your Space. Choose the location and get an idea for the amount of space you would like to use for your pergola.

## How to make rafter?

Measure the diagonal of the rafter. Start this measurement from the top (the long end) of the cut you just made.

**How to figure out rafter length?**

rafter length = √ (rise² + run²). The formula used to calculate rafter length from roof pitch is, in fact, the same as the one above. The one difference is that we need to calculate the roof rise using the pitch first. So what you need to do first is to get the pitch, using the following formula: rise = run * pitch.