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pressure treated wood is usually very wet when it is purchased. I've learned it is a good idea to let the deck age for several months to let the wood dry completly. When the wood is dry it will let the new treatment absorb.
nailing decking down often allows it to buckle as the wood dries. using screws helps keep decking where it belongs.
wood has a natural cup to it. on the end of the board look at the rings. the board should be laid so that the rings are convex or an upside down cup. this will allow water to run off the decking instead of getting trapped in a cup as the wood dries
good luck
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