Tom, I'm presently doing some restoration and improvement to my external double doors so your thread caught my eye.
Here are some pics of features that may help with your thought process:-
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The basic door fits inside the frame and the external weatherboard cladding overlaps the outer face of the frame
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A metal bar on the floor prevents water being blown in (although it didn't prevent a full flood during the 2007 storm - 4" in the w/s)
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External hinges which cannot be tampered with whist the door is closed
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Crash type door bolts which secure top and bottom on locking up
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At the moment there is no drip bar over the doors - I'm just off to buy some timber to make one.
Whilst these doors are not completely windproof, the rest of the workshop is. So it's pretty snug once the doors are closed.
Brian
