This is the alternative to using a door sweep.
Sliding door gap at bottom.
Get it as soon as wed sep 30.
Sliding doors slide best when a uniform gap is maintained along the edges and bottom of the door.
Work the sweep out toward the door knob edge of the door.
The sweep is a brushy or rubberized strip attached to the bottom of the door designed to close any gaps between the door and the sill.
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Check the weatherstripping or flashing.
This is a simple solution to your problem.
However in the second area there is a gap that leaks air.
Turning this screw raises or lowers the roller.
This is what i particularly suggest for the front door to keep our.
If the door becomes even harder to open turn the screw in the opposite direction.
Most sliding doors have a mechanism called an adjusting screw located at the bottom of the door ends.
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The first area the patio doors fit perfectly.
Give the screw a clockwise turn and test to see whether the door slides easier.
Replace damaged weatherstripping or flashing by removing the old and attaching new weatherstripping with screws or adhesive.
I had a contractor install sliding patio doors in 2 different areas in my house.
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If you ve noticed a large or small gap on the bottom.
There is an overlap between the moving door and the fixed door where the two doors should meet up and this is where the leak is occurring.
Weatherstripping and flashing are rubber insulators located on the bottom of the sliding door that secure the gap between the threshold and bottom of the door.
Open your door approximately six inches and watch the gap between the door and frame turn the adjustment screws with your screwdriver until a uniform gap is achieved.
Thank you both for the helpful and thoughtful comments.