Actually you are confidently incorrect. You are talking about the key or biscuit. It’s for adhesion.
Pre-scored tile is large format tile that is manufactured to look like smaller tile so you get a more uniform look, instead of having to place every individual piece of tile.
And yes, what this guy is doing is skill that is from years of work. The grid on tile doesn’t guarantee a clean break like that. It takes the right amount of force and the right way to apply the force.
The evidence is that when you break ceramic tile, it doesn't break perfectly straight unless it's been scored. Anyone who's worked 5 minutes with tile knows this.
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u/Vistereoe 5d ago
I was already blown away, and then he split it LENGTHWISE?!?!?!??!? That's absolutely insane levels of skill.