I was at a construction site in Eastern Europe and saw two stacks of boards. One was groove and groove, and the other was tongue and tongue. In the US I’ve only seen boards with tongues on one side and grooves on the other.
Any idea why these boards were done this way?
Seems odd and I can’t imagine why.
I guess it has a benefit in that you can swap ends, if for some reason grain pattern matches better one way than the other. Aside from that, got nothing.
Acquired at a steep discount as they were cut incorrectly!
All I can think of is to join two sections of tongue-and-groove which are aligned different ways.