I built a deck of some Asian hardwood with the same groove configuration and the grooves go on the bottom side to help stabilize the wood during the year long season movement.
I finished all sides of the decking boards before installing them and now all I have to do is finish with a top coat twice a year here in California.
There is no frost line where I live and pre-formed deck piers on compacted ground works fine as long as tree roots don't get under them.
Jack
I finished all sides of the decking boards before installing them and now all I have to do is finish with a top coat twice a year here in California.
There is no frost line where I live and pre-formed deck piers on compacted ground works fine as long as tree roots don't get under them.
Jack