My sister recently had a cracked slab. Her insurance did not cover it, but the builder's insurance did. Builder's insurance is usually 10 years, so I guess it would depend on the age of your home.
I would also find out the cause of the crack and weather or not there is product liability insurance involved. There are numerous variables that can cause a liability situation to an insurance company or insured. I would call a contractor to find out the cause of the crack.
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