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Tony[_19_]

wrote:
About 10 years ago we replaced carpet in the downstairs living room
with vinyl plank. The installers had to use a lot of mud to level the
floor and it looked great when they were done. Now, we see waves
under the flooring and cracks in the patio tile just outside.

My wife and I are wondering if the rate of settling is likely to
increase over time costing lots more to fix in the long run if we put
this off.

I can't answer your question but the problem may be fixed much better
using concrete jacking. (they drill holes in the floor all the way
through the slab, then pump concrete under the slab filling in any voids
and lifting any low spots.) But you would probably need a new floor
after that.