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Why Dry Wood? The answer to the question "Why dry wood?" must be "...To make money!" If it isn't profitable, then we generally don't do something. To understand what is profitable about an energy using, time consuming, labor intensive procedure, let us look more closely at what happens when we dry. Wood is a biological material that, when in the tree, contains large amounts of water. As wood dries to a moisture content (MC) in equilibrium with its in-use environment, many of its properties and characteristics change. • • • • • • • Much of the shrinkage that occurs when wood dries to its in-use MC will occur in the lumber dryer rather than in the manufactured product. Drying, therefore, eliminates, or reduces to a minimal level, a major source of frustration that a consumer has with wood- shrinkage and swelling. Dry wood has little or no likelihood of developing new cracks, checks, or splits. Dry wood (below 22% MC) will not decay, mold, mildew, or stain. At lower MC levels, there is not enough moisture for the fungi that cause decay, mildew, and so on to grow. Dry wood is much lighter in weight than wet wood. For many species, dry wood is nearly half the weight of wet wood. As an example, an "18-wheeler" can haul about 7500 BF of green oak without exceeding the load limits, but can haul 12,500 BF of dried lumber. Dry wood is nearly twice as strong and twice as stiff as green wood. Dry wood (if it is not too dry) fastens better, glues better, and machines better than wet wood. Dry wood can be treated more effectively with fire retardants than wet wood. It is these changes in properties that make it profitable to dry lumber. 5PDF Image | Principles and Practices of Drying Lumber
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