Max. Live Load 60 lbs/ft2 (2873 N/m2)

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

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

2 x 8 | 12 | 12′ – 3” |

16 | 11′ | |

24 | 9′ |

- The distance 2×8 rafters can span depends on the species, grade, spacing, and loads. Rafters, unlike joists, are sloped and experience loads and forces differently than joists or beams. A look at a rafter span table shows the allowable spans are between
**6’-7” and 23’-9”,**depending on the factors and loads.

## How far can a 2×8 Rafter span without support?

Also, how far can a 2×8 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**. The larger the deck, the larger the joists.

## How far can a rafter span without support?

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 far can I span a 2X6 Rafter?

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. In comparison, No. -1 grade lumber **can span** slightly further to 10 feet 11 inches under the same parameters.

## How far can 3 2×8 header span?

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

Southern Pine | 3–2X8 |
10′-7″ |

3-2X10 |
12′-9″ | |

3-2X12 |
15′-0″ | |

Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine | 3X6 OR 2-2X6 |
5′-2″ |

## How big of a beam do I need to span 20 feet?

For a **20** foot **span**, wood **beam needs** to be minimum 18 inches deep. We ended up lifting that heavy ass **beam** by by hand. This was about a **twenty** foot **span**, set the **beam** on 4″ round steel columns on 12×12 by 1/2 inch plate on block. So, if your **span** is 30 **feet** (or 360 inches) you **would** divide that by **20** to come to 18 **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 2×12 span without support?

How do I keep them even? 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 triple 2×12 beam span?

of 14 feet for a **triple 2×12**.

## How far can a 2×4 Rafter span without support?

**Spacing** your 2×4 shed **rafters** at 24” on center limits the width of your roof. For light load roofs, 24” o.c. 2×4 **rafters can span** up to 7 ⅔’. For heavy loads, 2x4s **can span** up to 5 ½’.

## How far can a 2×6 span for a metal roof?

Max. Live Load 20 lbs/ft2 (956 N/m2)

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

Nominal Size (inches) |
Rafter Spacing, Center to Center, OC (inches) |
Lumber Grade |

2 x 6 | 12 | 16′ – 4” |

16 | 14′ – 11” | |

24 | 13′ |

## How far can you cantilever a 2×6 roof?

Looking at the table below, **we** see that **2×6** floor joists **can** be cantilevered up to 2 feet and 6 inches (2′-6″) when the joists are spaced 16″ apart.

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

How far can a 2×6 Rafter span without support? 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**.

## How far can a 6×6 beam span without support?

Each 6×6 beam only spans 12 **feet**, of which 2 of those **feet** are supported by a knee brace. So technically the beams only span 10ft.

## What is the maximum span for a 2×8 header?

Figure B: Example of Calculating Header Size

Header Size |
Maximum Span |
Number of Trimmers |
---|---|---|

Double 2×6 | 4 ft., 0 in. | One |

Double 2×8 | 5 ft., 0 in. | Two |

Double 2×10 | 6 ft., 2 in. | Two |

Double 2×12 | 7 ft., 1 in. | Two |