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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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If pavers are an option, go with that. Wood decks are a lot of maintenance. And then they need to be replaced. :-/ I know I have one.
The plastic doesn't rot, but it will flex/warp/sag - joists need to be 16" OC or less (12" is better) And about those joists - they're wood. .. which will rot.
Because of that problem, when I added on to my deck, I capped the joists with copper flashing. Those have held up wonderfully.
fwiw, I went with vertical tight grain (old-growth) cedar. It's pretty tough stuff, even with the on-going mossy wetness of the PNW. (~15 y/o)
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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