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Yeah, I'm sure it'll last long enough, and I could replace the joists 3 times over and still be in pocket (which should be fairly easy given the way it's going to be constructed).
My concern is it's going be ground level, but suspended on a blockwork edge and with a soakaway area underneath, into which will run some small land drains. I'll pipe some vents in too and it'll probably last longer than most ground level decks do.
Polygon
I really wanted to use some kind of composite/recycled material for my deck for lots of reasons. But the cost meant I instead built it out of wood and just made sure I did everything possible to extend the life (post savers, treated cut ends, extra treatment for horizontal/mating surfaces, water run off etc). Expect to do annual maintenance also, but it's difficult to find ecologically responsible treatments that are actually good/well rated.
The last deck I built when I really had no idea what I was doing (posts resting on bricks, for example) was still going perfectly strong after 5 years when I moved. This one may outlive me.