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Kiln dried lumber is lumber that has been heated in a kiln so that it has a low moisture content. View slideshow of images above.or some applications, lumber that has been kiln dried can be used just as it is. In other instances, it may be necessary for the lumber to acclimate for one to two weeks, and the wood may pick up some additional moisture during this time.
The traditional rule-of-thumb for air-drying lumber is to allow one year of drying time per inch of wood thickness to properly air-dry lumber. In situations where green wood is to be processed into usable boards, (especially in the case of thicker lumber), a kiln is frequently used to control the drying process.