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For a well maintained and operated air dry yard drying easy-to-dry species, degrade costs may be about $10/MBF. For a poorly operated yard, or for drying thick, hard-to-dry or high value species, degrade costs may exceed $150/MBF. The degrade costs are typically in the range of $21 to $54 per MBF. The keys to controlling air drying degrade are to avoid wetting and drying cycling (that is, exposure to rain and sun), to dry at a reasonable rate for the species and thickness being dried, and to move the lumber into the kiln as quickly as possible (that is, avoid storage of dry lumber on the air drying yard). Forced-Air Air-Drying Degrade FAAD systems usually have low degrade for easy-to-dry species such as yellow-poplar, maple, and pine. Typically, the degrade costs range from $9 to $24 per MBF. Degrade is lower than air drying because the lumber is protected from rain and sunlight. However, for check-prone wood, such as oak, the drying will be too fast and excessive degrade will occur. Predryer Degrade If properly operated, predryers can have as little drying degrade as any of the drying systems. Predried lumber is bright, clean, and of excellent quality as compared with air-dried lumber. Drying degrade should be less than $10/MBF when the units are properly designed and operated. DH Degrade If properly operated, DH dryers can have as little drying degrade as any of the drying systems. Lumber is bright, clean, and of excellent quality as compared with air dried lumber. Drying degrade should be less than $10/MBF. Kiln Drying Degrade If properly maintained and operated, a dry kiln will provide good drying quality for most species. Drying degrade can be held to about $9 to $15 per MBF. When drying air-dried or predried lumber, it is rare to have any degrade attributed to the kiln operation; all degrade is formed beforehand. 11PDF Image | Principles and Practices of Drying Lumber
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