If you have a 30-foot span, it is important to know just how long a beam you will need for support. There is a good rule of thumb for this: divide your span (in inches) by 20. So, if your span is 30 feet (or 360 inches) you would divide that by 20 to come to 18 feet.

How far can a 2×8 beam span without support? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet.

Beside this, What size lumber can span 20 feet?

In this regard, what size lumber can span 20 feet? Re: 20 foot clearspan beam size In that case, you need something like a 12-16″ GLULAM or LVL to span the 20′ and can use simple 2×8-10 dimensional lumber 16″OC as floor joists.

Likewise, How far can a 2×6 beam span without support?

A 2×6 can support up to 50 pounds per square foot of weight without sagging with a maximum span of about 12 feet when spanning a distance horizontally, with the 2×6 standing in a vertical position.

Also, What size beam do I need to span 24 feet?

You’ll need at least a 12″ (nominal) I-joist or an engineered floor truss to span that far, or you’ll need an LVL or steel beam midway.

What size beam do I need to span 30 feet?

If you have a 30-foot span, it is important to know just how long a beam you will need for support. There is a good rule of thumb for this: divide your span (in inches) by 20. So, if your span is 30 feet (or 360 inches) you would divide that by 20 to come to 18 feet.

## 16 Related Question Answers Found

**How far can a beam span without support?**

How far can a 2×8 beam span without support? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet.

**How far can a 2×12 span without support?**

When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2×12 beam can span 12 feet; a (2) 2×10 can span 10 feet and so on.

**How far can a 2×10 beam span without support?**

When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2×12 beam can span 12 feet; a (2) 2×10 can span 10 feet and so on.

**What size board can span 20 feet?**

**What size beam is needed to span 22 feet?**

Use one 22′ long W8x48 steel beam down the center of your 22’x28′ rectangle. This steel beam is 8.5″ deep, plus a 1.5″ deep wood nailer plate, plus 0.75″ floor sheathing, means that the floor is 10.75″ at the deepest point. Then use 2×10 joists spaced at 16″ on center spanning 14′ on each side of the steel beam.

### How far can a triple 2×6 beam span?

10′ feet

### How far can a 2×8 board span?

12 feet

### How do I know what size beam to get?

Design a beam depth based on the rule of thumb for estimating the depth of manufactured beams which is to divide the span by 20. Beam depths are typically 5 1/2 inches, 7 1/4 inches, 9 1/4 inches, 11 1/4 inches, 11 7/8 inches, 14 inches, 16 inches, 18 inches, and 20 inches.

### Can you span 12 feet with a 2×6?

In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet. … 2×6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards.

### What distance can a 2×12 span?

12 feet

### How big of a beam do I need to span 24 feet?

You’ll need at least a 12″ (nominal) I-joist or an engineered floor truss to span that far, or you’ll need an LVL or steel beam midway.

### Can a 2×10 span 20 feet?

Douglas fir 2-by-10 joists graded as “Structural Select” allows joist spans up to 21 feet for a live load of 30 pounds per square foot when spaced 12 inches apart, 19 feet 1 inch for 16 inch spacing and 16 feet 8 inches for 24 inch spacing.

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