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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 key to any piece of wood is its moisture content. So, IF THE WOOD IS 7% MC (= to 38% relative humidity), it doesn't matter if it was kiln dried (properly) or air dried. If you air dry, however, the average outside humidity is 65% RH in almost the entire U.S., summer and winter.This is 12% MC.hy kiln-dried lumber is the best option for wood that will eventually 'live' indoors. 1998. by Professor Gene Wengert Q. Some one told me that kiln dried lumber is better to use than air dried.