Be sure to tape thin sheets of plywood over the glass to protect the door from flying pieces of concrete.
Leak under sliding glass door.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.
I used this tape for sealing.
Place the end of a strip of adhesive backed aluminum tape on one of the side jambs in the doorway 3 inches above the threshold.
A sliding glass door is no better than the frame into which it is placed.
Sometimes water intrusion is severe staining carpets and causing dryrot at the subfloor baseboards and sometimes even the wall.
Position the tape so that 1 2 inch extends beyond the front edge of.
Spray the door and look for the leak location.
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.
If you cannot re create the leak problem inspect the interior of the door for stains or rust.
Damage to the door itself.
Water leakage is a common problem with sliding door thresholds.
Once you ve exposed the top sides and bottom of the door you can assess what needs to be.
Leak in the basement trickles down wall from top of foundation directly beneath door.
When installing weatherstripping be sure to seal the entire door jamb with one continuous strip.
Test the door for the location of the leak.
1 leakage from poor failed caulk and or flashing over or around the door leaking down to the bottom of the door and then out onto the floor.
Even though well maintained sliding glass doors usually don t have water intrusion problems consider installing weatherstripping to prevent the leaks caused by driving rain.
Have a water leak in the basement beneath a jeldwen sliding glass door.
There are a number of causes for this many of whiich you might be able to debug when it it is raining or with a small amount of discrete sprinkling of the outside of the door.
Do you have any leaking windows or doors.
Weep holes on the door four in total are fully functional.