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Why my exterior door installation gone bad?

My exterior door installation gone bad, I want to know why?

I had a 36″x80″ steel door.Apparently there is another measurement i was supposed to take for the depth. Now I buy a new door it is 15mm too narrow(depth wise).

Of course it is already installed. What can I do now short of taking it out?

Answer:

Find the space then fill into it by a jamb extender, some square shaped pieces of wood may work on the interior cut to the 15mm you are shy. If it is so shy,then I suggestrehanging the door and finish the opening on the interior.

If the door frame is wood and has some sort of casing or brick moulding on it, you can cut the 15 mm from the back side of the casing to make jamb line up with interior.