"Ken Finney" wrote in
:

Two comments.

1. If I lived in hurricane country, I'd have at least one
Gunnite-type quonset hut to put my valuables in and hide in.

Oh, that explains it. Well, I was born and live in hurricane country (the
Caribbean) and very few people here have quonset huts to hide in. We just
stay indoors.

2. I've seen safe rooms built out of wood, but IIRC, they were made
of two sheets of 1 and and eighth plywood laminated together.

I've seen thicker wood complete run through by a flying piece of debris,
but never concrete.