Our yard is concrete but part of it is broken and buckling. We don't want to spend lots of money putting down new concrete. The yard is not that large. We figured we'd just put some nice outside tile down so if and when the ground shifts anymore because of an underground tunnel being fixed, all we would have to do is just fill in the cracks through the tile. Is this wise? Do we need to break up the concrete 1st before putting the tile down? What's the best tile to use outdoors? Should we put something over the concrete ground 1st before tiling?