We have a safe room roughly 25' long x 7' wide x 10' tall. It has concrete walls with a metal ceiling and concrete covered porch above it. The room gets very cold in the winter, I suspect mostly due to the uninsulated ceiling. Right now we have an open door to your conditioned basement from the safe room. How would you recommend insulating the ceiling?
I have considered:
Foam board attached to metal. I wondered if I could glue this up or would have to attach some other way?
Spray foam ceiling. I am guessing that would cost much more than the foam board and wouldn't be something I could do myself.
Putting a door in the opening to the safe room to slow the cold air. This would help but the room still shares uninsulated concrete walls with the rest of the basement.
With any option I have to deal with minor water leaks when water blows onto the porch and leaks through the concrete.
Thank you for any ideas and suggestions!