Bearing according to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
Door header calculator.
When in doubt use 2 by 12 inch headers.
Door header beam calculator.
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Garage door header size calculator.
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Measure the width of your door frame.
There are too many load variables to consider in one simple formula or rule.
Snow loads can vary tremendously as can roof ceiling and floor loads and the various.
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.
Most door frames that are 4 feet wide or less require a 2 by 6 header.
Better header span charts trinity.