For insurance to cover the damage it would have to be caused by a covered peril. IE., water, fire, wind, etc. Insurance companies will list what perils are covered and/or excluded. If the damage was prexisting and caused by a covered peril it may be possible to file a claim on the previous homeowners policy if it can be proved it happened while the previous owners policy was insuring the house. Any claim is a legal issue and if you are not sure there are attorneys who will willingly explore your options.