In his landmark textbook, Water in Buildings, Rose estimated the quantity of water held in a home’s building materials: “The wood alone in a house may account for over a ton of moisture,” Rose wrote. “Add to that the amount of water stored in other cellulosic material, such as drywall covering, books and cotton fabrics (assume 12% moisture content), and gypsum and other mineral materials, and the water stored in a building begins to appear considerable. … It is obvious that the water stored in the building materials outweighs the water contained in the air by a factor of 100 or more.”