Reinstall door shims. Replace the door shims that were removed prior to further tighten the corrections made to the frame. Don't fully tighten shims until you are satisfied with the correction.
· Use new door shims if the older door shims were damaged.
· Shims come in a variety of materials, including wood, plastic or metal. Wooden shims are the most commonly used shims and are versatile thanks to their ability to be trimmed. Use plastic shims on any exterior doors as they are resistant to rotting.
· Make sure you place a pair of shims at hinge height of the door, on both sides of the frame. This helps the door stay tightly secured, as much of the weight of the door is transferred to the frame at these heights.
· Use a spirit level to make sure the shims are level. Use as many shims as necessary to ensure the frame is installed level on its entire length.
· Open and close the door several times to test the security of the door. If the door still seems to be uneven with the frame, adjust the frame and shims as necessary to level out the door.
· Always re-nail places where you added shims.