This article was originally published on Crafting Your Home. A human contributor also wrote and edited the post.
An attic can feel like free storage space, but it’s one of the worst climates in a house for preserving anything. Without insulation or climate control, attics routinely swing between extreme summer heat and winter cold, with humidity levels that fluctuate right along with them. Here’s what home organization and safety experts consistently say to keep out.
Photographs and Important Documents
Experts at Public Storage told Newsweek that paper materials should stay out of the attic because of humidity and potential flooding can damage or destroy them. Apartment Therapy spoke with maintenance expert Robert Hand, who described record albums warping and family photos sticking together after being stored in attic conditions.
Electronics
According to Newsweek, heat and humidity reliably damage electronics, a point echoed across multiple home organization outlets. An old laptop or TV left in an uncooled attic for a season is a common way otherwise functional devices quietly stop working.
Wooden Furniture
Apartment Therapy’s home experts specifically flag wood furniture as vulnerable because Heat and humidity can cause wood to warp. Real Simple’s reporting adds that this risk applies to antiques in particular, where warping can permanently affect both structure and finish.
Musical Instruments
Lucas Workman, a brass repair technician at Siegfried’s Call, told Best Life that instruments shouldn’t be stored in attics because heat rises and humidity collects there, both of which damage wood and brass components alike.
Canned and Perishable Food
Professional organizer Reichert told Reader’s Digest that heats and cold fluctuations in an attic can damage the vacuum seal in canned goods, creating a risk of spoiled food even before the can is opened. Apartment Therapy’s experts put it more bluntly: attic heat can effectively cook canned goods over a single summer.
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Paint
Apartment Therapy notes that oil paints shouldn’t be stored in an attic because they’re flammable, and even latex paint, while non-flammable, tends to deteriorate over time in attic conditions.
Flammable Items and Chemicals
Multiple outlets, including Apartment Therapy and Tom’s Guide, warn against storing propane tanks, kerosene heaters, oil lamps, aerosol cans, and batteries in an attic because of the fire risk combined with extreme heat exposure.
Clothing, Linens and Leather
Professional organizer Eryn Donaldson told Homes & Gardens that leather items don’t hold up in humid conditions, which is part of why leather furniture is rarely seen in humid climates. Master Certified Kon Mari Consultant Karin Socci told Best Life that heat, humidity, and cold can wreak havoc on fabric items generally, while organizing expert Cacic told Reader’s Digest that attic humidity creates mold and musty odors in stored clothing.
Books
Home organizer Rapinchuk told Reader’s Digest that big swings in temperature and humidity can damage books directly, beyond simply attracting pests looking for paper to nest in.
Medications
Home safety expert Tim, quoted in Homes & Gardens, warns against storing medication of any kind in the attic, since humidity and temperature swings can degrade them faster, and old expired medication left up there becomes its own hazard over time.
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Candles
Clever dude’s home safety roundup specifically flags candles as a common attic casualty, noting that melted wax can seep into wood or insulation and leaves a lingering odor that’s difficult to remove fully.
What Can Actually Go Up There
The common thread across all of this expert advice is temperature and humidity sensitivity. Durable, non-perishable items in sealed plastic bins, holiday decorations that aren’t waxed or electronic, and off-season sporting gear tend to hold up fine. Keep anything organic, flammable, or electronic in a climate-controlled closet or basement.
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