## How far can 2×8 joists span?

Depending on various factors, the maximum span for a 2×8 floor joist is 16′ 6”. The maximum span for roof rafters is 23′ 9”. For headers, the maximum span is 11′ 2”. Finally, a single deck beam has a maximum span of 5′ 11” and double maxes out at 8′ 9”.

### What is the maximum span for a 2×10 floor joist?

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.

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

Deck Joist Spacing by Wood Type & Deck Size

Joist Spacing (o.c.) | 24″ | |
---|---|---|

Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir | 2×10 | 11′-1″ |

2×12 | 12′-10″ | |

Redwood, Western Cedars, Ponderosa Pine, Red Pine | 2×6 | 6′-10″ |

2×8 | 8′-8″ |

**Should you use 2×6 or 2×8 for deck joists?**

You can use 2×6 as deck joists if the deck is low enough to the ground as not to require guard railing. When using S-P-F 2×6 deck joists, the span must not be greater than 9’0″ (2.73m) with joists at 16″ o.c. (400mm), and 9’10” (3.01m)with spacing at 12″ (300mm).

**How far can 2X8 span 12?**

Max. Live Load 30 lbs/ft2 (1436 N/m2)

Maximum Span (ft – in) | ||
---|---|---|

Nominal Size (inches) | Joist Spacing Center to Center (inches) | Lumber Grade |

2 x 10 | 24 | 15′ – 0″ |

2 x 12 | 12 | 24′ – 8″ |

16 | 21′ – 4″ |

## How far can a double 2X8 deck beam span?

Dimensional Lumber Deck Beam Span Chart

Joist Spans | ||
---|---|---|

Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine | 3X8 OR 2-2X8 | 6′-7″ |

3X10 OR 2-2X10 | 8′-1″ | |

3X12 OR 2-2X12 | 9′-5″ | |

4X6 | 6′-2″ |

### How far can a triple 2×8 beam span?

How far can a triple 2×8 beam span:- as per general rules and guidelines, #2 grade southern pine of a triple 2×8 deck beam can span upto 10 to 11 feet when total load of 50 psf (40 psf live load + 10 psf dead load) with deflection limit L/360.

#### How far can a 2×10 deck beam span?

A two-ply 2×10 beam, for example, has an allowable span of just 6 feet 9 inches for a joist spanning 14 feet and 6 feet 4 inches on 16 feet. Bigger beams also mean a greater span. A 3 ply 2×10 beam can handle a span of 8 feet 6 inches for a joist spanning 14 feet and 7 feet 11 inches at 16 feet.

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