Hi everyone. After some advice. I rebuilt my deck frame using c24 6x2 pressure treated timbers and after months of searching and waiting, my delivery of 5.4m Canterbury style decking arrived today. Hard to find during lockdown as the local timber yards were either sold out, did grooves both sides only, or were not doing longer than 4.8m lengths. Anyway, I want smooth side up as I find grooves uncomfortable. I believe grooves were designed to be on the underside anyway! The delivery driver noted the missus checking for the smooth side and said we should have used 6x2s! That got me thinking - is there a downside to this? Is decking board not just a 6x2 cut in half and grooved? At 2 inches, the timber will be much thicker than a deck board so should last longer and give room to be sanded down if needed. The price difference is £1 which makes the decking look like a rip off! Seems like a no brainer to me unless I am missing something very obvious or there are other differences I am missing. I think I will waterproof the areas where the frame and underside of the top timber meet to make up for the lack of grooves for water to escape. I assume the slip hazard is no worse and the plan was to add an anti slip coating after oiling. Thoughts?