Letter Re: Mass Versus Bullets (and Hail Stones and Gamma Radiation)
James, I appreciate seeing some folks trying to build some sort of fallout shelter, as these may, unfortunately come in handy someday soon. Since I build these for a living, I thought I’d throw some basic suggestions out there for the readers. For simple fallout shelters, assuming that blast will not be a factor, above ground concrete walls should be 24 inches thick (or better if you can afford it!). Walls below grade can be a mere 10 inches thick. Ceilings: 24 inches will provide fair protection, assuming “rainout” does not occur in your locale. [The Swiss shelter building code …