Fireplace chimney is sinking
Chimney slab is separate from foundation of home. It is 6 1/2 feet by 2 feet. Chimney is block and brick. Chimney has a 1/4 " horizontal crack all the way around it, 2 feet from grown level. This crack is stable and hasn't changed in one month. There are other horizonal cracks around main crack. But much smaller. Our soil is sink/swell clay.
After digging around chimney, discovered the slab is a mere 5" thick.
Had some fireplace folks out. The rest of fireplace is stable, including where it attaches to house and roof.
I've called foundation repair companies. Most haven't a clue what to do. Another suggested 2 helio tiles/jacks? 20-40 feet down until they hit limestone. They want us to have an engineer look at it first. Repair and engineer will cost $5000. Is there an easier/cheaper way to fix this?
I didn't call insurance company,as we have a high detuctible