Is it a common practice to build a chimney on the floor of the house. Basically the structure is supporting the entire weight of the chimney. Now I will add another twist. The chimneys where taken down to just below the ridge line to allow the roof ridge beam to rest on top of the chimneys. From the attic I can look down between the apartments and see a void between the chimney and floor joist support beam large enough to walk through. Who does stupid stuff like this. I don't know everything but I have never seen a chimney supported by the house. I have three and the house is sinking. Maybe somebody has some input or ideas. I have a couple of ideas but wow this is going to be a major project. Thanks for any input.