Designers and builders are aware of the issue.
My french doors are leaking.
However in some instances.
The problem is one of two things or perhaps a combination of both.
Open both doors fully and stabilize each with a doorstop.
The weatherstrip provides consistent compressed seal and is usually designed.
However french doors come together with no overlap and an increased chance for air infiltration.
Tighten the screws in the hinges at the edges of the doors and at the faces.
When a door leaks the most common suspect is the bottom corner of the unit.
Nevertheless they continually struggle to prevent water infiltration through this fundamental building element.
Caulk the bottom of the threshold until the entire surface is covered with caulk.
Along the jambs or in between french doors.
If that is the case there is no reason why french doors that open into your home should leak.
Either the doors or the factory weather sealing around them is faulty or there is something wrong with the installation.
Carefully remove the threshold from.
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How to fix a french door sill leak 1.
Open your french doors and prop them fully open.
Remove all screws holding the threshold in place and set them aside for reuse.
Set up a power or cordless drill with a screw tip attachment.
Sliding doors overlap which is a more energy efficient design and creates a tighter seal.