Lumber will be treated differently for the applications. It will most likely have little depressions in it if it is treated. That is where they inject the chemicals. If it is green it will most likely be for above ground use, below ground use is usually brown treated. One is cca treated and one is acq(I believe). There is also differences in the amount of chemical or density of the chemical. If the boards look the same and any have end tags on them I would assume they are all the same. Most of the time the green treated is cheaper so there is more of it sold.
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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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