## How far can decking span?

Decking boards span from joist to joist. If you use 5/4 decking, joists must be no farther apart than 16 inches. Decking with boards with a 2×4 or 2×6 span can be 24 inches.

## How far can deck joist span without support?

A 2×6 spaced 16 inches apart can span a maximum distance of 13 feet 5 inches when used as a rafter, 10 feet 9 inches when used as a joist, and 6 feet 11 inches when used as a deck beam to support joists with a 6-foot span.

**How far can you span a 2×8 deck joist?**

Span is determined by species, grade, dimensions, spacing, use, and load. A rule of thumb is 1.5 times a joist’s depth but in feet when spaced at 16” centers. In general, a 2×8 will span 1.5 x 8, so 12-feet. Based on all factors though, a 2×8 joist span is 7′-1” to 16′-6”, and a rafter 6′-7” and 23′-9”.

### How far can you span a 2×10 deck joist?

How Far Can a 2×10 Beam or Header Span? A 2×10 beam – made up of two 2x10s nailed together – can span up to 11′ without support beneath a deck that is 4′ wide. For a more normal-sized deck, the same beam can span 8′, supporting a deck that is 8′ wide.

### How many posts do I need for a 12×20 deck?

Quick Attached Deck Footing Chart

Size of Deck | Beam Size | Number of Footings |
---|---|---|

10′ x 12′ | (3) 2×8 | 2 |

12′ x 12′ | (2) 2×6 | 3 |

16′ x 16′ | (3) 2×8 | 3 |

20′ x 12′ | (2) 2×8 | 3 |

**How far apart should deck beams be?**

Most decks use 16″ on center spacing for joists. Most decking is not strong enough to support wider spans than 16″. Some builders reduce joist spacing to 12″ on center to strengthen the deck frame or to increase maximum allowable joist spans.

## How far apart should deck post be?

Starting with your perimeter, mark the location of each deck post to locate the fitting position. In general, posts should be spaced no more than 8 feet apart. Some builders position them every 4 feet for a completely rigid frame. The maximum distance between footings is determined by the size of your joist material.

## How many footings do I need for a 12×12 floating deck?

For an attached 12 x 12′ deck, you’ll need at least 3 footings, plus at least 2 more if you’re planning on building stairs with it. If your deck will be a different size, it’s easy to figure out how many you’ll need.

**How far apart are footers for a deck?**

How Many Footings Will I Need? The standard rule for footings is that for a basic deck, the larger the beam and footing size, the fewer footings you’ll need. If you’re building a simple deck, footings and posts should be placed 8 feet apart on average.

### Can you span 10 feet with a 2×8?

The rule of thumb is to multiply that depth by 1.5 and change the amount to feet to determine the span. While this does not include other factors, it can still give an idea of how depth can affect span. Using this rule, a 2×6 will span 9 feet, a 2×8 will span 12 feet, and a 2×10 will span 15 feet.

### Can a 2×10 span 18 feet?

A #2-2×10 joist can span between 11′-5” and 18′-0”, as a rafter between 13′-9” and 21′-7”, and as a beam 3′-6” and 13′-0” or more. The span depends on spacing, lumber species, and grade, and for a beam, the lamination thickness, as well as numerous other factors.

**How far can you span a 2×6 deck joist?**

The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12’-6”, ceiling joist 20’-8”, rafter 18’-0”, deck board 24”, deck joist 9’-11”, deck beam 8’-3”, and 6’-1” as for header. Always check the codes for determining factors or consult a Structural Engineer.

## How to read span chart?

Check plans to determine span and on-center spacing (design conditions)

## What is a deck span?

Span requirements ensure your deck won’t sag or collapse during a party or under snow load.

**How to figure deck footings?**

Get a permit. To make sure your project is compliant with local rules,check out local building codes and obtain a permit before breaking ground.