If you’re going to pour a concrete pad, you can place your shed directly on the pad, but you’ll want to make sure the pad is thick enough to support the weight of the structure and its intended purposes. If you’re not going to pour a pad, but you want your shed to have a floor, you need to raise the floor by about four inches. This makes it easier to pain, but it also allows for increased airflow and circulation underneath, which will mitigate moisture issues and keep the contents of your shed dry.