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Old 01-13-2008, 04:21 PM   #1
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Garage door header sizing


I am building a detached storage building (16 by 24) and planning to install a 9 foot wide garage door in one gable end. ( I will have a regular 36 inch enterence door on an eave side). There is no second story so the only load on the wall is the 1 by 2 pitched asphalt shingled roof. I was planning to used a doubled 1 by 12 header with plywood sandwiched between; and 2 jack studs (cripples) at either end of the header. I did a seach on Google and found a reference that a 1 by 12 header is only good for up to 7 feet.
(I looked in my own garage and found a doubled 1 by 10 spanning a 16 foot door.) Now I am confused, can someone give me some direction?

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Old 01-13-2008, 05:58 PM   #2
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Garage door header sizing


Is the 1 in 1 x 12 a typo? I,m guessing you mean a double 2 x 12 with the 1/2" plywood sandwich, bringing it to a standard wall thickness of 3 1/2". This would be plenty adequate for this situation.

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Old 01-13-2008, 06:14 PM   #3
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Garage door header sizing


Yes a typo, I meant a doubled 2 by 12.
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Old 01-13-2008, 06:57 PM   #4
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Garage door header sizing


Sounds like you should be alright.

As a side point: Do you live in a snow zone? If so, then you will also have the snow load up on your roof too. Something for all DIYers to take into consideration.
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