What to do when installing a prehung door on a finished floor
If the finished floor is already installed:
If the finished floor is already installed, the jamb legs may need to be cut to acheive the correct reveal around the door. Using a level and a shim, figure out if their is a difference in height across the width of the opening. If the floor is level, trim the jam so that the door will clear the finished floor by about 1/2". If the floor is out of level, trim that much more off the jamb on the high side.
