## What size header is needed for a 9 foot span?

How far can a 4×8 header span:- as per general rules and guidelines, nominal size of a 4×8 header can span upto 8 feet. Thus, 8 feet is maximum allowable span for 4×8 size header. Therefore, for a span upto 8 foot, you needed 4×8 size header. 4×8 size header is needed for a 8 foot span or opening.

**What size is a 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 |

**How far can a 4X10 header span?**

7′-5″

Dimensional Lumber Deck Beam Span Chart

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

Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine | 4X10 | 7′-5″ |

4X12 | 8′-7″ | |

3-2X6 | 5′-9″ | |

3-2X8 |

### How big of a header do I need for a 10 garage door?

10 foot garage door header size:- as per general thumb rule and guidelines, for a 10 foot garage door, header should be double- 2×10 in size, in which 10 inches deep and 4 inches width, thus you will need something like double- 2×10 or 4×10 lumber header for a 10 foot garage door.

**How far can a triple 2×8 header span without support?**

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.

**How far can a double 2×8 header span without support?**

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. As you can see, the larger the depth, the longer the span.

## What is a header span on a door?

Header spans are typical for a window and a patio door. The structural ridge span represents the size of a large family room. The span for the girder is based on the size of an average-sized game room. And the garage door header is based on a 2-car garage-door opening.

**How many 2x6s are needed for a 4 foot header?**

For example, if the span is 4 feet, add 2 to 4 for a sum of 6. Therefore, the header would need to be made from doubled 2x6s. For odd numbers, round up.

**How do you measure for a double header?**

It went like this: Measure the span in feet and add 2 to that number. The sum will be the height of your double header in inches. For example, if the span is 4 feet, add 2 to 4 for a sum of 6. Therefore, the header would need to be made from doubled 2x6s.

### Is there a “rule of thumb” for designing headers?

But from a professional engineer’s perspective, the problem is that the rule is not comprehensive; it may work for a single-story home with an average snow load, but it doesn’t work for every situation. So the short answer is, there is no comprehensive “rule of thumb” that is useful (and safe) for designing headers. Consider how a header functions.