Green lumber is not necessarily a lumber that’s green; though it might, sometimes, be a little greenish. And it’s also not a definition of an environmentally conscious type of wood.
Ok, what’s the best green lumber definition, then?
Let’s say that green lumber is wood that had not had the adequate time to dry and be seasoned. That kind of wood is not good for Real Estate, so you might hear a contractor say “That’s green lumber; we can’t use it”. And the reason why it’s no good is because green lumber can warp with time – not to mention that is much more difficult to work with. Cutting and nailing a green lumber is basically a waste of time and energy.
Some people call it wet lumber, but the term is not 100% correct because a wet/moist lumber is not necessarily a green lumber and it can be used in construction.
However, because the environment changes materials, green lumber is sometimes used in arid regions of the United States like Arizona and California. The thinking behind it is that (i) green lumber is cheaper and (ii) because the lumber dries and comes of age faster over there, once they get transported they will quickly reach a fine point for construction.