## How far can a 2×12 rafter span without support?

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 12 | 12 | 18′ |

16 | 15′ – 7” | |

24 | 12′ – 9” |

**What size should roof rafters be?**

The industry standard for roof joist or rafter spacing is 12”, 16”, 19.2”, and 24” on-center, typically though, rafters are spaced 16” or 24” on-center. The gap between members can be different provided it meets code requirements.

### What size purlins should I use?

The sizes are as follows: A four-inch purlin can span 12 feet. A six-inch purlin can span 18 feet. An eight-inch purlin can span 25 feet.

**What is the weight of purlins?**

C & Z Purlins

Purlin Section | W (mm) | Section Mass (kg/m) |
---|---|---|

Sizes | ||

Section | C150-12 | C200-15 |

Thickness | 1.2 | 1.5 |

Web | 152 | 203 |

## How much weight can a 20ft 2×12 hold?

A 2×12 can hold approximately 180 pounds per foot or approximately 2,100 pounds in total.

**Should rafters be 2×4 or 2×6?**

For roofs that won’t experience heavy snow loads, a gable roof can span up to 22′ with 2×4 rafters. For roofs that will experience heavy snow or wind and will span the same distance, use 2×6 rafters. If you have a simple gable shed roof, then using 2×4 rafters makes more sense unless you have a very large shed.

### What does 8 C purlin weigh?

Product Description. Weight: 3.37 Lbs.

**What is the size of C purlins?**

The standard length of C purlins is 6 meters.

## How thick is a purlin?

Purlins are typically anywhere from 4” up to 12” with a flange width of 1-½” up to 4”.