Recently I let my son-in-law use my shop for a project and he planned a 1 by 12 board down to a little less than 3/8" thickness. I think he did this just because he liked the sound of my planner. I told him this was a mistake because the thinner board would cup and twist more with age than the inch thickness. Was I right in telling him this? My thought was that a 4 by 4 is used for a post because it twist less than a 2 by 4.
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