I wanted to put in a wood stove and pipe it through my secondary flue on the backside of my fireplace flue. Well this evening I was sitting here and I heard the some shifting of the flue tiles. I went down stairs and upon further inspection, I noticed that I lost the first two tiles. The first two tiles slid completely down. The first tile crumbled, but the second tile is intact, just fallen lower than it should be. My question is what would be my best and cheapest plan of action? Can I re-line after I remove what tiles have fallen and are loose or do I remove all of the tiles? Can I use a stainless steel flue re-lining kit without my ceramic flue tiles, or do I need to have my chimney re-tiled?