|Strength test of prefab safe room.|
|Safe room from www.familyhandyman.com|
Most safe rooms are constructed to simply protect from flying storm debris and possibly an intruder. Assuming reliable communications (cell phone, radio, or alarm system), you would expect to exit the room within an hour and no provisions inside the safe room would be required. Safe rooms that are not sealed can be as large or small as you have available space. An NSSA (National Storm Shelter Association) installer suggested four square feet minimum per person. That's pretty small! If you intend to use a safe room to ride out a hurricane or avoid radiological exposure you'll need to take great care to provide for all your needs for a longer period of time. According to the US Department of Justice room with ten square feet of floor space per person may be sealed for five hours before rising carbon dioxide levels become a concern, so you'll need to consider air quality in addition to food, water, and hygiene if you intend to remain in your safe room for hours or days straight.