Heavy gauge steel studs 8 inches on center with a layer of 3/4 plywood on each side then use 3/4 inch security screen screwed to the plywood covered with 2 layers of 5/8 drywall and finished to paint. Door is a heavy steel firerated and well pinned with double dead bolts.Along with a good security system, Was good enough for the CFO to approve 2 years ago. Cost me about the same a a good gun vault including permits.
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