Sometimes for me, the best way to tell if the felt is vertical or horizontal is by teasing it apart. It will usually separate easier in the direction that the fleeces were laid down.
It's a tricky spelling, but the correct one is "Laoureaux".Laoureux is a company which produces all kinds of felt for all kinds of applications, including a wide range of piano felts. Even among the damper felts there is a whole buffet of choices. Sadly, supply houses offer only a fraction of what is actually produced; piano manufacturers get their damper felts made to spec regarding dimensions, density etc.So we must remember that when we try to describe a damper felt by calling it "Laoureux" it is a bit like trying to define a vehicle by calling it "Ford".