My neighbors' giant tree's roots has been encroaching to my property. I send him an email about a year ago and he told me that he was going to trim the tree. My concern is that the roots are so thick that they already destroyed one of my pipes. The concrete in one part of the entrance by my home is about 1/2 inch raised. The concrete by my garage is cracked. I am concerned about the water and gas pipes. What are my options? Do I report it to my home insurance? I live in California and I was told that there could be a chance that if I report it to my home insurance that they could tell me that they will cancel the insurance if I don't fix it. Any advice?