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It all depends on the fire rating of your safe.
Mark
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The only thing I keep wondering about home safes (I have one as well) is how do you get into the thing after a devastating fire? I mean, the locking mechanism is going to be toast, so it will take an angle grinder, torch, or the Jaws of Life to open the thing (seems to me). I'm thinking a safe deposit box at the bank may be a better alternative.
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When I used to sell building materials one of our vendors proved to us that cinder block, which has a 2 hour fire rating, proved in real life to be much lower.
"Green cinder block" (fairly new with a high moisture content) will get the 2 hour rating. But cinder block that has dried out over 5 or 10 years will fail far earlier--less than one hour and sometimes as little as 30 minutes.
My understanding is that some of the fire rated safes are lined with concrete. I never cracked one open to see. But if that is the case then I suspect that the fire rating would go down over time.
I suppose you could break through the concrete in the corner of the garage and pour a cavity that was large enough to contain the safe. Being below the flamables it would be much less apt to be subjected to the same heat (and surrounded with concrete and soil too).
I guess you could build a cinder block enclosure around the safe. Just wet out the cinder block a few times a year to keep the fire rating up.
I suspect that asbestos is a bad idea.
Someone suggested a safety deposit box. Not too expensive. It sounds like the best alternative.
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Dave, no home safe will protect your papers in a devastating fire. I used to fire test those things. Most are junk. The ones that weigh hundreds of pounds last the longest, but that's still only a couple of hours against a standardized test that's not nearly as severe as a devastating house fire. Anything that you can carry is a waste of money. If you want to protect your important papers put them in safe deposit box at the bank of your choice. That's where mine are.
John