How to Install Steel Security Door

Security doors are often installed on the outside of the home over an entry door, to provide further protection to the house. Most security doors are made from steel. You can install a steel security door in the same way you would install a regular storm door, and can do so in a few short steps.

1. Use a tape measure to measure the width and height of the opening for the steel security door.


2. Find the Z-bar on the security door, which is located on the side of the door near the hinge. Use a hacksaw to cut this bar, so it is 3/16 of an inch shorter than the height of the new steel security door that you are installing.


3. Place the new security door in the opening on the outside, and use a level to ensure that the new door is square in the opening. Drill a hole for the hinges, and then attach the hinges to the door using screws. Attach the Z-bar to the door.


4. Slide the header over the top of the new door, and insert the screws into the drilled holes. Cut the Z-bar here using a hacksaw so that it is 1/8 inch taller than the steel security door.


5. Slide the door sweep on the bottom of the steel security door, and insert the screws into the drilled holes. Use screws that are at least 1 inch to secure the sweep to the new door. Attach the closer to the top of the door in the center and screw it in, and then attach to the jamb using 2-inch screws. Open and close the door to ensure it works properly.