We've had porches built onto our house, front and back. We want to have stable type doors, which open inwards (wind's too strong to have doors opening outwards), so we can have air but not chickens and sheep coming in.
So how do you make sure that horizontal wind and rain doesn't come in where the top and bottom meet? Normally, there is a small wooden or metal sill type thing attached to the bottom of the top half of the door, which projects down to cover the gap. This plus a seal of some kind is fine for a door which opens outwards, but with it arranged so the top opens inwards, obviously the sill would catch on the top of the bottom half and not let the top open when the bottom is kept closed. So, you put the sill higher up, so it doesn't bump into the bottom half. Fine, but this now exposes the join to horizontal rain, wind, sleet, snow etc.
So I suppose, after all that, my question is, what design of seal, or combination of seals, will prevent wet getting in enough to rot the top of the bottom half of the door?