However in some instances the top corner of the door is the true culprit.
Patio door leaking at top.
The gutters are clear and the patio is level.
Spray the door and look for the leak location.
Whether your door is sagging or bowed or just not making proper contact with the weatherstrip to seal out air and water the upper corners of your frame could be the problem.
Water can also get under the threshold of a door especially if the door was installed without adequate sealant between the underside of the threshold and the top of the sub floor.
Here is the solution to fix it relatively easily and permanently.
Got a water leak around or below a upvc window or door.
Even if your door is new keep in mind that window and door openings that don t have correctly installed flashing oftentimes succumb to the elements.
I ve got a sliding patio door on the back of my home there s a moisture problem directly under the door in the basement.
If you cannot re create the leak problem inspect the interior of the door for stains or.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
Get the sealant here usa.
Note that if the sliding glass door leak you described has already worked its way under any adjacent exterior siding you ll likely have to remove and reapply that siding as well in order to install the new material and repair the leaking sliding glass door but the extra effort will be well worth it the next time coastal winds blow rain your way.
Step 1 test the door for the location of the leak.
Moisture could be.