Be in all rows
Next, take the board or guide and fix it horizontally, this will be the basis of the very first row of tiles. The base is checked by the level, it should be strictly horizontal, otherwise the displacement will be in all rows.
Next, take the board or guide and fix it horizontally, this will be the basis of the very first row of tiles. The base is checked by the level, it should be strictly horizontal, otherwise the displacement will be in all rows.