That being said it does have its shortcomings. Since treated lumber comes from the lumberyard with a very high moisture content it is very prone to shrinkage, cracking, warping, cupping, curling, and twisting. Often times when a contractor builds a treated deck it looks great the day of completion but once the wood dries many of the problems with treated lumber are revealed. This can appear to be poor craftsmanship to someone that does not know what to expect from treated lumber. However, it has nothing to do with craftsmanship at all and is just the nature of the wood. That said, treated lumber is widely used worldwide for building decks and outside of its shortcomings it can last a very long time, remain structurally sound, and is the cheapest option for building a deck. You can expect a life span of 15-25 years from a well-built treated lumber deck.
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