The 2x4, 2x6, 2x8, 2x10, etc lumber that is treated is NOT generally treated for in-ground use. It has only 1/2 the amount of chemical needed for burial as posts, etc.
To get flat dimension lumber treated for in-ground use, you would normally have to special order or get directly from the treating company.
The square pieces: 4x4, 6x6, 8x8 are normally treated to double that amount of chemical. Check the end tags for the pounds per cubic foot that it is treated to.
The old CCA treated material is banned for residential use, and now is ACQ or some other chemical.
CCA can still be used for industrial or farm applications, but you will have to special order, possibly from the company that does the chemical application. (The ban on CCA material is a whole 'nother rant.)
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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