Once choice is to use moisture to reverse the effects of the warp.
How to fix a warped sliding door.
Determine where the crown the highest point of the warp is mark it and flip the wood over so that the crown is on the ground.
You have a few options for straightening out warped wood.
To me a warped frame means twisted.
Place as heavy objects on the warped side of the door until the warp is reversed as far as possible without damaging the door.
I would replace the door because that s the easiest solution but if you have more patience than i do here are tips for flattening a warped door.
What you need to fix a warped wooden door.
Straightening the track could be the most difficult.
Leave the pencil in place for 30 minutes.
Take the pencil out to see if the door has started to straighten.
In order to fix a twisted frame you ll need to 1 remove the track threshold 2 clean the track and where it s placed 3 straighten the track and 4 re secure the track to its correct position.
If the door has begun to straighten but is still slightly warped you will want to repeat the pencil in the door method.
Let the door remain this way.
Allow the door to remain on the sawhorses for at least 72 hours or longer.
There are replacement tracks has to match the old one that will now lay in the slot.
Basically you take a rivet buster chisel and die grinder and remove the track.
You then use a die grinder burr to smooth the surface.
Two sawhorses screwdriver sandpaper heavy towels or a large blanket varnish paintbrush 50 lb sandbag or something of equal weight.
Place the heavy objects at the center of the crown of the warp.