It looks like there is an alternative to stainless steel for fasteners used in ACQ lumber. I am unsure about market availability but the technology is in place for a cost effective solution to corrosion problems in this application. If I find a good source for nail or screws I will share them with you.
http://www.commscope.com/ICSFiles/afieldfile/2007/02/01/ccs_for_fasteners.pdf
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Nice , post thanks for info