Spray the door and look for the leak location.
Less air leakage at sliding or swinging door.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
The best hinged door option is a single swinging door and one or two large insulated glass panels next to it.
It may seem obvious but a door left open or one that cannot be closed tightly because of wear and tear is a significant problem during a storm.
Common leak paths for doors.
A door with one fixed panel will have less air leakage than a door with two operating panels.
When buying or replacing patio doors swinging doors generally offer a tighter seal than sliding types.
Causes of door leaks there are many potential pathways for water to leak in through a door but the biggest opening is of course the doorway itself.
Hinged doors leak a lot less air than sliding doors.
Sliding doors overlap which is a more efficient design and creates a tighter seal where as french doors come together with no overlap and an increased chance for air infiltration.
Step 1 test the door for the location of the leak.
Look at nfrc labels to find air leakage ratings.
The area where they meet at the center is susceptible to air and water leakage.
Also as winds blows against a french door it tends to bow thus causing additional air leakage.
Occasionally these sliding doors leak and need to be repaired.
Sliding glass doors are less secure security wise and more prone to greater maintenance needs mechanical problems sliding problems locking problems etc.
That design avoids two swinging doors that seal to each other in the middle which can leak air as it ages.
If you cannot re create the leak problem inspect the interior of the door for stains or.