Z, the US FEMA has download-able plans and drawings for several different types of "safe rooms",
ranging from cellar, to cell-lean-to, to outside cement, and to plywood.
The FEMA statements are along the lines of "adequate to protect"
I found these via Google search for: "FEMA saferoom design drawings"
But I have not been able to launch the FEMA P-320 .dwg files,
and haven't been able to figure out how to download the .pdf files.
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