Most of the better safes have a rubber gasket that isn't air tight initially. However, it is made to expand and become air tight once it is heated by a fire. That is why the contents don't get burnt or damaged when subjected to 1600 degree for 90 minutes. The safes are also insulated to help with the heat.
Now, if that gasket expands during a fire and creates an air tight seal on the safe, I would assume that the seal would also be water tight. So, that should take care of the water issue. However, as mentioned above, putting the safe on a concrete block specifically made for it would be another way to accomplish this. Maybe 4" off the ground would be a good idea.
Me, I have all kinds of idea for my gun/bike room when we move into a single family home. Problem is getting the home and then being able to afford the room.
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The pond, waterfowl, and yellow labs...it don't get any better.
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