F
Flintstone
It’s really quite simple!
I only have 1 here so i cannot check an others, I didn't know they could of started out as 60x60.I believe it to be direction of travel thro ovens/kilns. And it would make sense that the pattern flows that way because it’s the direction of travel through process. If there’s a fairly even split between arrows and non arrows it’s generally cos at the end of the process, 60 x 60’s are cut in half. That’s why it’s only on some and not others.
Because a quality installer will know which way around they go, no need for arrows.I only have 1 here so i cannot check an others, I didn't know they could of started out as 60x60.
So if it is deemed an important issue by the manufacturer to aid the installer with arrows then why cut them off on half of them.