What have done towards your prep?

[Mortblanc]

With no climate control tins are going to expand and contract and eventually split. That is simply a function of physics.

Even with even controlled temps and a good roof I have to check my stores of tinned food constantly to watch for rust. Stored in a shed with a leaky roof I would expect rust to ruin tins within a couple of months.

The problem is not how you stacked the tins, it is WHERE you stacked the tins.

My greatest problem with tinned foods is the breakdown of the plastic liner inside the tin. I have opened soups to find bits of plastic floating in the contents where the liner had decomposed. That was with major brands too, not the cheap tinned stuff.

I no longer store soups. Besides, they are "death in a can" if one checks the contents and nutrition info on the label. Probably would not matter in a crisis and all the salt, sugar and empty carbs you could cram into a tin would be welcome.

Apparently that "use by" date actually means something with tinned foods. The food might not go bad but the tin has a definite lifespan.

I have never had any problems with canned meats spoiling. Never had a problem with tinned vegetables either, except for tomato based foods. The acids in tomatoes will eat through a tin in a few months. They go from the inside too, so it is the acid that does the damage.