How To Repair Water Damaged Door Frame. Age misuse extreme temperature changes or moisture can cause a door frame to warp. I have used this to repair water swollen wood with good results.

Press the form against the filler and attach it with screws. Use a screwdriver or a similar tool to gently poke the frame and feel for softness in the wood. This can keep the door usable for a long time helping you avoid expensiv.
Then straighten the frame by hammering it with your rubber mallet.
Use a screwdriver or a similar tool to gently poke the frame and feel for softness in the wood. Rot warps the wood and doesnt allow the door to sit plumb in the frame. Check for a Draft or an Improperly Closing Door. The problem with wood rot is that it may look nominal but it can actually be widespread.

