Garage Door Header Size Calculator

Most door frames that are 4 feet wide or less require a 2 by 6 header.

Garage door header size calculator. Between 4 and 5 feet the header should be built 2 inches wide and 8 inches long while a larger opening needs a header that is 2 by 12. When in doubt use 2 by 12 inch headers. The column on the left of each chart labeled beam span represents the beam length with bearing required for your project. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.

On longer spans the beam may require much more bearing space as indicated by this table. Anything 5 and above we always at least double cripple. Posted on october 29 2019 by bandi ruma. Window door garage door headers supporting roof wall floor loads.

Determine the beam header span length and the span carried supported by the beam header. Click on the appropriate beam this will take you to the calculation table for your project. Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications. Measure the width of your door frame.

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