Mould growth in any environment requires moisture. One reason why basements are notorious for mould growth is because most of them are ever damp. Although moulds differ in the amount of moisture they require for growth, there is a level of moisture below which no mould can grow. Therefore, if we can ensure that organic materials in the basement are dry then we can effectively control mould growth. For example, if we can keep the relative humidity at or below 60%, we can be sure there would be little (if any) mould growth.