Seen that, how do you grout it , set it, and open it ?
I was curious to that also but found another video of it, he silicones those joints then carefully slices the Silicon on one side so it can open but the Silicon stays in place on the tile for when it's closed to fill the grout lines. The video will make more sense I'll find it...
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@widler
Quite a smart idea actually, I'd have never thought of it