How to Install a Door Jamb Kit


Door jamb kits are available at home improvement stores and are ready for installation. This can save you a lot of time and work as far as building the jamb, but you still have to have some patience installing it in the rough opening. For it to look right, the jamb needs to be leveled. This requires some basic tools and supplies.

Things You'll Need

  • Sandpaper or saw
  • Level
  • Shims
  • Nails
  • Hammer
  • Place the door jamb in the rough opening. If it doesn't quite fit, lower it back down and trim off the bottom small amounts at a time with sandpaper or a saw. Cut both sides the same amount until the frame fits in the open.

  • Raise the jamb back into the opening and put a level on top of the frame. If it isn't level, tap shims under the side of the jamb that is lower in order to level it. Have someone keep an eye on the level and let you know when it is right. Set the door aside and nail the shims with a hammer to keep them from slipping, then put the jamb back in place.

  • Push the jamb to on side of the rough opening and check the level again. If the rough opening is square, the jamb should be level. If not, stack shims between the jamb and the opening until it is level. Slide the jamb out and nail the shims in place. Do the same thing again on the other side.

  • Hammer nails into the jamb to install it to the rough opening. Nail through shims if they are present.

  • Nail the trim to the other side of the jamb. It should have come with the kit. Use small 1 1/2-inch nails. The jamb typically comes with the trim already attached to one side, but not the other. This way you are able to slip it into the opening.

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