Letter Re: Rourke on The Stealth Survival Retreat

Saturday, Dec 10, 2005

Jim,
Beware of a second pouring to thicken a concrete shelter lid for added fallout protection. It is essentially a dead load that causes the lid to get closer to it’s stress limit. Thickness adds strength only when it is part of a single pouring, with all the needed rebar integrated. I would advise consulting an engineer before adding unforeseen load to a concrete span. - Mr. Bravo


JWR Replies: Thanks for mentioning that! I have just added a proviso to my original post.


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