It makes sense that when we start running out of room for our gear, we start looking outward and upward. I store stuff in my detached garage, for example. But most of us have an attic that is sitting there, mostly empty, while our spare bedrooms and closets are bursting at the seams with canned goods and emergency supplies. (if only!)
So, it’s tempting to think of that space as a “free” storage unit, but the reality of attic storage is often much harsher than you realize, and an attic is about the worst place you can choose.
Why do we keep trying to make the attic work? Clearly, it’s a matter of space utilization, but it can be a silent killer when it comes to long-term shelf life of just about any survival supplies. Sadly, when you go to reach for your “insurance policy” during a crisis only to find it’s gone rancid or been chewed through by mice, you haven’t prepared at all … you’ve just wasted money and possibly put your very survival at risk.
The primary enemy in any attic is the combination of extreme heat and humidity. Most attics are designed to breathe, but they aren’t designed to maintain a stable temperature. In the peak of summer, an attic can easily reach 140°F or higher, even if it’s only 90°F outside. This kind of heat is an absolute nightmare for food storage.
I remember when I first started getting serious about bulk supplies, I made the mistake of storing some items in a non-air-conditioned detached garage. It wasn’t an attic, but the temperature swings and the humidity were similar enough to teach me a hard lesson. I quickly realized that the “investment” I was making in bulk food and water storage was being destroyed by the non-air-conditioned environment. I stopped storing anything perishable in unconditioned spaces shortly after that.
When you subject food to those kinds of temperature extremes, the nutritional value doesn’t just dip—it falls off a cliff. I like to reference this chart on MREInfo.com regarding shelf-life that illustrates the problem. For instance, at a stable 60°F, an MRE will last many years, but if you bump that up to 100°F, you’re looking at a shelf life measured in months, not years. Now imagine what 140°F does to the fats in your food: they go rancid incredibly fast! And that’s to say nothing of the nutritional degradation because, even if the food technically remains “safe” to eat in a survival situation, the loss of caloric density and vitamins means you aren’t getting what your body needs to stay healthy.
Similarly, freezing temperatures aren’t good for many supplies, either, like canned foods. And, as you might suspect, attics are notorious for becoming intolerably cold in the winter if they’re not air-conditioned.
Beyond the temperature swings, we have to talk about humidity and the biological “guests” it brings along. Attics are notorious for moisture buildup, especially if the ventilation isn’t very good. This creates a breeding ground for mold and mildew. While a sealed can might resist mold on the outside, the cardboard boxes they come in will disintegrate and become a food source for fungi. Eventually, that environment may cause the can’s shell to rust, thus threatening your food.
Then there are the rodents and insects. To a squirrel or a mouse, your attic is already a five-star hotel; adding a stockpile of grain or even “sealed” plastic buckets is like a welcome buffet. They have all day to chew through plastic, and trust me, they will.
There’s also a chemical side to this that people often overlook, specifically off-gassing and leaching. We use a lot of plastic in prepping, especially buckets, jugs, and bins. At normal room temperatures, these are generally stable. But when you bake them in a 140-degree-plus attic for many months straight, those plastics can begin to soften and leach chemicals into whatever is inside them. This is especially true for water storage and probably food, too. If you’ve ever tasted water that’s been sitting in a hot plastic bottle in a car, you know exactly what I’m talking about. It’s not just a bad taste that you’re left with. Rather, it’s a sign that the structural integrity of the container is failing at a molecular level which means you’re essentially drinking the container.
Obviously, some things are (probably) fine in the attic. If you have extra metal tools, certain types of nylon gear (though heat eventually degrades many synthetics), or perhaps some extra blankets that are stored so that rodents can’t get to them, then the attic might be okay. But for anything that you rely on to keep you alive, specifically food, water, medications, and anything perishable, the attic is essentially the worst choice imaginable.
Ultimately, your preparedness strategy should be built on real-world evidence and historical precedent, not just on where you have an empty square foot of floor space. While it’s tempting to use every inch of the house, the attic is almost always a bad idea for anything perishable or sensitive to heat and humidity. Keep your life-sustaining supplies where they have the best chance of survival, which is in the cool, dry, and dark areas of your home. It might mean a bit more clutter in the short term, but you’ll have the peace of mind knowing that when you finally need those supplies, they will actually be viable when needed.
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