Just hide the substructure and protect the wooden deck, then the terrace is ready.
So that the terrace is really perfect, she needs a good degree. System solutions such as »Villagio« from Osmo usually offer the more elegant solutions. There are suitable final traverses here, that have shallow grooves, to attach the connecting brackets flush. With "Villagio", the resulting all-round joint is adapted to the plank joints and the substructure is elegantly hidden. The traverses are screwed to the joists and to each other at the corners. Because the »Villagio« system does not have any visible screw connections, the truss assembly should also be invisible. With a so-called plug drill (Top light, 012 mm about 65 Euro) you can make appropriate plugs from a leftover piece (see above).