The purpose of owning a safe is to keep valuable items protected from losses, such as thefts, fading, fires and water damage. The next step to keeping your items secure is to protect them from incidents that may occur from within the safe, such as mold and mildew damage. When exposed to mold, coins, jewelry, firearms, passports, deeds, birth certificates and other items lose their value or effectiveness. By preventing moisture in a safe, you’ll keep your belongings in good condition and retain their worth.