Why are some 2x4 green?

"Green lumber" is another term for wet lumber, which is wood used in construction that has a moisture content of more than 19%. InterNACHI finds that green lumber is more commonly used in arid regions of the United States, such as Arizona and parts of California, because the wood will dry more quickly.

nachi.org - Green Lumber - InterNACHI®

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by Nick Gromicko, CMI® and Kenton Shepard

"Green lumber" is another term for wet lumber, which is wood used in construction that has a moisture content of more than 19%.

Moisture Content

InterNACHI finds that green lumber is more commonly used in arid regions of the United States, such as Arizona and parts of California, because the wood will dry more quickly. Damper regions often require kiln-dried wood, which must have a moisture content of 19% or less. The additional expense of kiln-dried wood is the reason it is used in only a small portion of construction. Freshly cut wood will gradually lose moisture until it reaches equilibrium with its surroundings, which is referred to as its “equilibrium moisture content” (EMC). As it dries, the wood will shrink in size. Wood will continue to lose moisture until it reaches EMC, at which point it’s said to have reached its “in-service condition.” The water that fills wood cells is known as “free water,” which accounts for most of the water weight of a tree. Cell walls also contain water, which is known as “bound water.” The weight of the water can account for more than half the mass of a tree in some species when it is cut down. Ideally, the lapse between the time the tree is first cut until the tree’s wood is used in construction will allow for most or all of the free water to evaporate, but this does not always happen. Shortly after wood is processed in mills, it is bundled and wrapped in plastic, which retards evaporation. The wood has little chance to dry until the bundle is unwrapped and the framing process begins at the construction site.

Why is green lumber used?

It is relatively inexpensive.

Green lumber is softer than seasoned wood. It can be cut more easily, is not as likely to split, and nails can be driven into it more easily.

Problems associated with the use of green lumber:

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mrhappyhouse.com - How Long Does It Take For Wood To Rot From Water? | Mr. Happy House

Is water coming into your home? A well built house with the right framing and expertise is surely not capable of withstanding the true forces of nature. Depending the type of wood installed, whether if it’s in the framing, siding, soffit, fascia, or decking, rotted wood is never something that should be ignored. Over time, rotted wood can pose a serious health hazard if kept untreated for a long time. Rotted wood can start to degenerate and lose it’s strength, making your home vulnerable to future damage. The best way to prevent your wood siding, framing, soffit, or fascia from rotting is to first take preliminary steps beforehand, but if you’re on this page, then it is most likely that you already have rotted wood, so let’s first identify the rot and fix the issue before you have this:

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