Storing in a safe

[SideShow Bob]

Is there a vapor barrier over the dirt floor of the crawl space ?
And if it is the older type of crawl space home you could be getting moisture intrusion from the crawl space vents.
You may need to crawl around down there and look at the bottom side of the floors to look for leaks around any drain or water line and check for signs of moist or wet dirt down there, it should all be dry.
Also in that type of AC unit they cut corners and run the drain tube straight into the dirt.

[sometimesright]

Affirmative on the vapor barrier down there. I poked around the other day when I was down there, but not to any great extent. Nothing looked amiss. I can put that on tomorrow's list. It may keep me off the computer for awhile and having no more Ka-boom's like at the range today (but that's in another area of the forum). Thanks.

[BPTactical]

Air circulation.

[relichunter]

My gun room is in my finished basement. My house is about 12 years old. Twice I brought guns home and had them rust within a week. Keeping them oiled helps alot. I bought a humidity guage and the humidity seem to vary from 40% - 65%.

I'd agree with the circulation suggestion. I also think wide temperature changes can cause condensation then rust.

I solved the problem by buying a water resistant safe and putting in four of those little plug in boxes. They last about 2 weeks before they turn pink. I have had 0 problems with rust in the last year.