High fire rating walls rated at 3 hours with 6 concrete wall thickness safe room considerations.
Concrete safe room ventilation.
Safe room must be adequately anchored to resist overturning and uplift.
These structures are designed to provide what the federal emergency management agency fema considers to be near absolute protection a term describing the level of protection necessary to significantly lower chances of.
So i have seen some moisture wicking through from above.
Walls ceiling and doors of the shelter must withstand wind pressure and resist penetration by wind borne debris and falling objects.
Plan for ventilation issues in advance of building.
A dehumidifier should be run inside the vault room for at least a year or two following construction.
The only place i would be concerned about moisture in the room is the ceiling.
It is pored concrete but like i said before this room is below the outdoor porch.
American safe room manufactures these heavy duty steel ventilation pipes unique and easy bolt on installation with engineered concrete wedge anchors and a thick rubber gasket they feature an armored rain hood that has an removable insect screen and a high security fastener to hold it in place.
The safe room however is all concrete.
And even that has a layer of 2 foam on the outside before it was back filled.
The doors are typically made of high gauge steel tested to resist high wind forces and perforation by windborne debris.
These issues are more difficult for a vault room than for inside a gun safe.