Thx for yours answers. I create a 2º UV Channel with enough space between islands and snaped vertex into the grid:
But still the same problem: #&:mad: lines appears again! The funny thing is i have a modulate floor built with the same process of the wall and every thing is ok with it: No ugly lines between meshes.
So after hours of yoga meditation i found the incredible solution… I distroyed the wall and remade it from scratch using yours advices. Now there is no lines and everything fits perfectly
Thx all of you guys.