Just wondering how fireproofing material can "generate" moisture...
Wow, you already have a Goldenrod AND a dehumidifier? I keep my Browning safe in my finished garage w/o problem. It is an insulated safe with a Goldenrod in the bottom corner. Is your rod mounted as low as possible? Safes are not airtight, even fire rated ones. The rod heats up and the hot air rises. The moving air is what keeps condensation from settling on the firearms. If you have the rod mounted somewhere too high, the air will not circulate properly.