We recently finished building a house. We had a safe room/storm room constructed that doubles as our master bedroom walk-in closet.
The safe room is a 7' x 10' room, with 8" thick solid (poured) concrete walls, and 8" thick solid concrete ceiling. The concrete walls are reinforced with 12' interlocking/interwoven pieces of 1" thick rebar. These also extend into the house foundation.
The door frame is a heavy gauge metal frame that was inserted into the form before the concrete was poured, meaning that the door frame is now filled completely with concrete. The door frame itself is about 5" thick--not quite as thick as the walls.
I don't remember the exact specs on the door, but it's a multilayer, heavy gauge metal door. It weighs several hundred pounds. I'm currently using a heavy duty door knob with lock to secure the door.
Now, on to my question:
I would really like to add some kind of multipoint locking setup to the door, preferably just something that will latch and secure each corner of the door. I've been thinking of a fairly simple sliding bolt setup, screwed into the door, with the bolt sliding into a hole/receiver in the concrete wall. My problem is this: If I just drill a hole into the concrete wall, to accept the bolt as it slides, I only have about 1.5" to work with, which I don't think will be strong enough. I was thinking of attaching some kind of bolt receiver to the door frame, which would entail drilling through the metal door frame, and the concrete beneath. Again, I'm just not sure if this type of attachment is strong enough.
Ideally, I'd like this setup to be able to withstand a pair of decent size grown men ramming into the door, or tornado-force winds.
I'm trying to describe this as I can without pictures. I'll try to post some pics of my setup and room sometime this evening.
ideas last night. All of my solutions until now consisted of attaching something to the outside of the door. I might try to find some commercial one-sided deadbolts that I could put in the door itself. Seems like it might be the most secure option. A jimmy-proof deadbolt sounds even more attractive.