There are a few reasons why doors start sagging and rubbing or becoming misaligned, this issue can cause some inconvenience, mainly if it affects your front door and you have no way of locking it, it's not much comfort either if the bedroom or bathroom door won't close. Luckily we've been fixing doors for many years and developed solutions to deal with these issues pronto. Below is just one solution that can be applied.
4. CContinue to open and close the door, this process will make sure all the problem areas are identified.
5. For this example the door happens to be rubbing on the bottom, so that's where our focus will be.
8. Get some sandpaper around 40 grit and start rubbing back the edges, this will smooth out all the base after the cut.
Myreno Handyman | Note: Some doors are really heavy if this is the case do not attempt this on your own; in any case, this should only be carried out by a professional or experienced person only.