I have had my house up for sale and it was unoccupied. My next door neighbour has has a major water leak and water has permeated into my side of the house and has damaged floor boards and caused them to bow and lift. I will have to get them ripped up replaced and dry out affected rooms. Can I claim off my neighbours insurance as my own insurance wont cover the damage as we were unable to insure it for water damage while house was unoccupied.
Seriously though, if you could find out a little more about what exactly happened to cause the leak and the ingress to your property you might be able to raise a stateable case. If the leak was just a chance event then you would seem to be without remedy.