Moisture and Mold Problems: Preventing and Solving Them in Your Home

Keep Items in Storage Units & Portable Storage Containers
Dry and Free from Rust, Mold, Mildew and Odors

prevent mold, mildew on your stored furniture

Americans are storing more items in Portable Storage Containers (like PODS) and Self-Serve Storage Units every year. And every year they are having to throw away hundreds of thousands of dollars worth of their belongings due to damage caused by rust, mold and mildew. This does not need to happen! Even in ‘climate-controlled’ storage facilities you can have problems if the humidity is not kept low as well. Rust can start forming as low as 45% Relative Humidity and molds and mildew at 60% RH, regardless of what temperature it may be (do things get moldy in your refrigerator?). Many items put into storage units are natural environments for mold and mildew to grow on. Leather goods, clothing, certain types of soft plastics and papers, wood and many other items. And if it is damp enough for molds and mildew, then it is also damp enough for rust to start forming on any metal that they may be attached to or in contact with.

prevent mildew and mold on clothing

Using pouches of Dri-It® can help protect your possessions and prevent the formation of rust, mold and mildew on your couches, tables, lamps, cribs, dining room and bedroom furniture, shoes, clothing, TVs, appliances, important papers, old-school memorabilia, anything valuable to you that you are storing.

Pouches of Dri-It placed evenly throughout the storage area will absorb any excess moisture in the air to help keep your valuables protected from rust, mold, mildew and odors. Since there are no pails full of liquid and chemicals to spill or worry about overflowing, there are no limits to the places you can protect. If you have items stored in plastic storage bins, simply remove the paper backing from the pouch to expose the adhesive back and stick the pouch to the inside of the lid where it will provide extra protection to those items and prevent mold, mildew, and rust from starting. Moisture penetrates through the printed label side of the Dri-It® pouch where it is turned into a gel and is trapped inside the pouch. When the pouch is full and feels completely 'gel-like', simply dispose of it in your standard waste and replace with a fresh pouch.

If you have a large storage unit requiring many Dri-It® pouches, please see our bulk quantities of Dri-It available without the individual retail packaging.

The chart below provides a starting point for the number of pouches needed for different uses.
The ideal amount for your situation will vary depending on many factors, including your normal relative humidity levels; Corrosion/Rust starts forming at 45% RH and Mold & Mildew at 60% RH.
Storage volume is based on 50 cu. ft. (an area 5 ft. x 5 ft. x 2 ft.).

The actual amount you may need will depend on variables such as how many moisture retaining items (seat cushions, carpeting, etc.) there are, how watertight the cover is, stored in a shed or in the open, etc..
Storage Unit Size
(L x W x 8 ft height)
Minimum Suggested
Number of Pouches

5 ft. x 5 ft.


5 ft. x 10 ft.


5 ft. x 15 ft.


10 ft. x 10 ft.


10 ft. x 20 ft.


10 ft. x 30 ft.


10 ft. x 40 ft.




  • You do not have to worry about over-drying with Dri-It, and you cannot put too many pouches in an area. Dri-It is designed to lower RH no lower than 30%. Extra pouches will simply share the moisture load and extend the time between changing pouches for new ones.
  • When choosing a location to place the Dri-It® pouch, please consider the weight of the "full" pouch. A completely saturated pouch will weigh over 12 ounces. The adhesive on the pouch is designed to hold a full pouch for an extended period of time, however due to temperature fluctuations and other factors (cleanliness of the mounting surface, etc.), the pouch may pull loose after a while.
  • The printed side of the Dri-It® pouch is the side where the moisture enters and is turned into a gel. Blocking this will reduce the effectiveness of the Dri-It material to absorb moisture.
  • Occasionally there is a chemical reaction between the printing on the pouch and different surfaces. To avoid damaging paint, wallpaper or other surfaces, keep the printed side up. Do not place the printed side of the Dri-ItŪ pouch in direct contact with metal.