Walls

Hello!
When building three different type of walls (stone, plank, brick), do i need to leave one tile of space in between them or it doesn't matter?
Also, splash damage is only happening in same type of walls or weaker, right?
Thanks
When building three different type of walls (stone, plank, brick), do i need to leave one tile of space in between them or it doesn't matter?
Also, splash damage is only happening in same type of walls or weaker, right?
Thanks
