Window covers also keep rain, dirt, dust, animals and other harmful materials out of a basement. Most styles are strong and durable, creating an impenetrable barrier between the outside and the inside. Melting snow is a particular problem in basements. Window wells that are deep and aged are more susceptible to letting water get through, but with a strong window well cover, the basement will stay dry throughout the wettest periods. Areas with high amounts of snow each winter are notorious for causing basement flooding through unprotected window wells. When water gets into a basement, it can create the perfect damp conditions necessary for the growth of mold, so this is another reason people install basement window covers. Basements under normal conditions don't get enough proper ventilation and tend to be damp. Mold experts will tell you that if you take a damp environment and keep it unventilated, mold is almost surely to grow. The presence of mold in a home can cau...