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What Is Conditioning? Conditioning is adding moisture back to the surface of the lumber to relieve any stress that occurs in the outer surface, which dries and shrinks faster than the interior. Stress can also occur because of how the lumber is sawn or where the tree grew. A tree that grows on the side of a hill or mountain may have stresses from that. If proper drying schedules are not used, the outer surface of the lumber will dry much faster, and the surface will tends to shrink more than the interior, and it is “stretched”. This stress remains after the lumber is dried, and if it is not relieved it can cause the wood to deform, especially when it is being worked. Nyle recommends people do a “stress test” at the end of a load to know the status of the lumber. Air–dried lumber tends to have less stress at the end of drying because of variations in the weather. Air drying offers little control over drying rates, so damage can occur easily in some hardwoods, (see pages 6, 7). If the lumber isn’t used immediately out of the kiln, it will condition itself naturally with time. Not all species are prone to stress, and the final use of the lumber may not require stress relief. For example, if the lumber is going to be planned on 4 sides, the stressed wood will be lost. 15PDF Image | INTRODUCTION TO KILN DRYING
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