All the decking without terram or geotextile is making me cry, you'll be cutting weeds and grass out the gaps in 3 months, I pulled the turf up then layed a terram over the top, all well and good but I didn't put enough fall on it front to back so it stays wet and gets slippery.
I haven't seen a single weed/bit of grass in 2 years. I guess no sunlight = dead plants.