I am going to build a deck which will be coverd to some degree but may get wet in some areas. What I would like to know is whether the grooved side of the decking (treated pine) is layed on the upside or are the grooves meant to be on the underside screwed to the bearers?
I have asked this question of the timber supplier and others but I am getting conflicting advice. If anyone knows and knows why the grooves are one sided only, it would appreciated if you could tell me.
Thanks in advance