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Old 09-09-2009, 09:59 PM   #1
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Framing Exterior Door

I want to put a new door in my garage out to the backyard. There isn't a door there now so I need to cut the opening and frame it. This is something I've never done before. I've done a lot of reading about cutting the opening, king studs, jack studs, cripples etc. and I'm comfortable with most of that but I don't know how to determine the height of the opening. Please look at this photo. The garage wall has a cement footing around it that is around 6 high. On top of that is a 2x4 and then on top of that is another 2x4 which I guess is the exterior wall. Which of these 2x4s, if any, do I cut away for the door rough opening? Im worried about getting the rough opening cut right for the height. Which board does the door rest on?



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Old 09-10-2009, 06:13 AM   #2
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Door openings are generally about 2" larger that the outside dimensions of the door. A 36" door should have a rough opening of 38x83. The threshold can sit on the bottom plate. You will need a small step.


Last edited by Just Bill; 09-10-2009 at 06:16 AM.
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Old 09-10-2009, 06:35 AM   #3
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Thanks but

Thanks for the reply. I understand that the opening height needs to be around 2" more than the door itself but from where do I measure the height based on this photo? Would you cut away just the first 2x4 and measure up from there or both and measure up from the cement?
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