Gap Between Exterior Wood Double Doors
As to the gap issue, if they are exterior doors, you are going to need some type of astragal - either "T" or flat - to help seal out the elements. The gap itself should be about 3/32. The oldtimers used to carry a silver dollar in their pockets to use as a gap gauge.
From contributor D:
Yeah, I've run into those old timers with a few coins in their pocket. The last one wanted dime gaps on a houseful of interior doors. I told him he should just trust us, he said we probably couldn't do it to such demanding tolerances (this is a contest?). I said if I did, I didn't want a call to go back and refit all his doors. He said no problem. He called when about a third of them were sticking. He wanted me to fix them all, no charge - said I should have tried harder to talk him out of it, that he was a man of reason. I love this business.
Do the math. EMC for your area (adjusted for exterior), MC of your stock, with the width of the stiles (crossgrain) times four and some ciphering will tell you how much they will swell. Use the handy-dandy shrinkulator on this site. With some practice, you can get pretty good at fitting them right the first time. After 35 years, we go out about 3-5 times a year for refits.
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