"Reversible decking boards" Please explain!

Ha ! Righty-ho then. That one link seems to answer the question once and for all. Any board type, be it smooth one side and ribbed the other, or ribbed differently either side, can be laid any way up you like, based purely on your preference for appearance and grip profile.

Cheers Dave !

Arfa

Surely the decorative side which isn't too deep would be on top as it is ju st raised a little to prevent slips and the straight deeper groove side wo uld face down and that would allow for any movement in the timber and as wi th any floor unless you scrub it now and again then you will slide

So many myths in this thread. The ribbed side should _always_ be on the bot tom by design, not to prevent cupping, but to provide the maximum number o f drip points so that water doesn't cling to the underside of the board. If both sides have grooves, it's the side with most ribs (i.e.drip strips) th at go underneath.

This link explains all