If you put this over a wood deck, how do you secure it? Does it need nails or glue? There are no railings or anything on the one edge to keep it from moving.
You wouldn't need nails or glue to secure our Helios Deck Tiles tiles to your wood deck. The tiles can be interlocked together, and the weight of these tiles will be enough to keep them from moving. Please ensure your wood deck is level and free from any defects.