scritch wrote in :


Go with the TREX. No maintenance.
The cement board depending on brand is pretty porous as it is meant to
bond to mortar or a glue.



I live in the soggy Northwest near Seattle. I've read that composite
decking, such as Trex, still needs maintenance as in pressure washing in
order to keep it from becoming mossy and slippery. What's been your
experience?

My experience -- not with my own deck, fortunately, just at a building where I was a visitor
recently -- is that even fairly new Trex, with no visible moss, fungus, or anything else, is quite
slippery when wet.