When choosing a carpet padding for basement floors, the best option is padding that is resistant to odor and moisture. Open-cell padding is a good choice as it fights moisture by allowing the carpet to 'breathe.'
It is important to rid the basement of odors and moisture before installing carpet padding and carpeting. When choosing carpet padding for a basement floor, be sure there is a stamp on the pad stating it provides odor protection. Open-cell padding placed down before the carpet will keep odors and moisture out for good. Additionally, inquire whether the padding and carpet can be cleaned and dried with a wet/dry vacuum.