Logs that are cut from the forest, brought to a mill or to a log home construction yard, bark removed, and then used to build the log home shell (handcrafted log homes), or sent through profiling machines (manufactured logs) are usually referred to as "green" logs if they have not been air-dried or kiln-dried. "Green" does not refer to color, it refers to moisture content (MC). The actual moisture content of "green" logs varies considerably with species of tree (cedar, fir, spruce, pine, etc), season in which it was cut down, and whether sapwood or heartwood is being measured. Green logs may have a moisture content between about 20% and 90% (oven-dry method of measuring MC).

One type of air-dried log is "dead standing," which refers to trees that have died from a natural cause (bug kill, virus, fire, or etc), and then were cut down after they died. Standing dead trees may be cut down 1 month after they died, or decades after they died, and so the term "dead standing" does not necessarily mean the logs have been dried down to Equilibrium Moisture Content. Dead standing logs can therefore be green, or they can be more-or-less dry.

After construction, green logs dry in service in the log building. Within about 4 years, green logs that are part of a completed log home come to equilibrium with their local conditions and have a moisture content of between 6% and 12% (known as Equilibrium Moisture Content, EMC). The actual EMC varies with local climate, season of the year, and geographic location.

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