The chimney on my house used to be one of those old brick ones that goes all the way down to a fireplace on the ground floor. The previous owner of my house removed the fireplace and almost all of the interior part of the chimney. The only parts left are the actual chimney on the roof, with a large, partially removed part dangling under it in the attic. This has proved way to heavy for the roof to support, so I initially wanted to remove it but the brickwork is in such a bad condition that I'm afraid hacking away at it would cause the whole thing to collapse, damaging either my attic floor, the wall, the roof, and possibly hurting people outside. Also removing the chimney would leave me with a hole in my roof that I am currently unable to repair.
I'm now thinking of rebuilding part of the chimney on a strong surface that can carry the load.
There are two sturdy beams supporting the roof near the partially demolished chimney. I was thinking of bolting two perpendicular support beams onto them, with a layer of concrete forming plywood resting on top of them, below the chimney. I figured I could then build up a brick support that the chimney could then rest upon, distributing the weight through the support onto the roof beams, like so:
Is this a sound strategy, or am I likely to run into trouble?