this post was submitted on 09 Dec 2024
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Yeah, 2x4s aren't even 2"x4" anymore, more like 1.5"x3.5", but the name has still stuck.
that has nothing to do with metric vs imperial:
"Lumber manufacturers typically cut a tree into the various standard types of dimensional lumber very shortly after the tree is felled. At this point, the 2 x 4 is actually 2 inches x 4 inches, a 2 x 10 is actually 2 inches x 10 inches, etc. But then the newly-sawn (but soaking wet) lumber is then kiln-dried until it reaches the desired moisture level. During this process, it shrinks as the moisture in the wood is removed and the wood cells shrink. Once the drying is complete, the boards are then planed to a standard size. Hence, what started out as a 2 x 4 now measures 1 1/2 inches x 3 1/2 inches."
https://www.thesprucecrafts.com/why-isnt-a-2x4-a-2x4-3970461
And you sometimes get people ordering lumber for the first time giving bad reviews because they feel they've been cheated out of some wood.
Yep, just an example of how names don't necessarily correspond to the actual dimensions.