I'm no carpenter, but I do have french doors, and since no one has answered your question : The doors in my house are 30" wide and the opening is 60.25", the extra .25" is pretty much the gap between the two doors. The hinges are mitered into the frame and are practically flush when the door is closed.
FYI, mortising the jamb and door for the hinges is a huge PITA. You can get a jig at Lee Valley to do this, but you're better off getting the door store to pre mortise if you can. If you talk to the guys at the store, I'd bet they'd talk you into getting prehung doors and replacing the entire frame/jamb.
Last edited by Jedi Ninja; 11-21-2009 at 08:20 AM.
Reason: mortising
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