I also ust purchased a home with a set of french doors that are apparently leaking: E.g.,
EXTERIOR: It seems that water from the cement porch (from rain, hosing off, marine layer drip from the roof) may be seeping in at the bottom of the wooden threshhold that sits flush with the porch (exterior). It is not coming over the top of the threshhold. The threshold currently has some type of caulking (looks & feels like rubber)at the bottom - where it joins the porch - which look to be watertight. Putting up a gutter may help - but it won't eliminate the problem. Any ideas ...?
INTERIOR: The hardwood floor in front of the doors is now damp & raised. I've put plywood on it to (hopefully) flatten it while it's damp. Any suggestions?