I agree with Attorney Smith. You should contact a contractor to determine how much it would cost to remedy the problem. I would then have a lawyer write a demand letter to the former owner. You do not say when you purchased the home, but there is a statute of limitations, so you need to keep that in mind, as well.
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You need to get a price on all this before anyone can give you a practical response. I have brought these lawsuits before -- expect to be into it for $5,000 and then, you may not win all of your damages. and you may not recover your attorney fees. You need ALOT of damage to make the legal pursuit of this worthwhile.