This is the first and best evidence gathering you should do.
Get a repair estimate
It is critical to get a qualified contractor to prepare a comprehensive estimate. It should not be your wife's brother who is a contractor, or your neighbor who comes by and gives you a rough estimate. The insurance company will want everything itemized and you need to be sure that you have a bid from a contractor who understands the scope of damage, the true cost of repairs, and the way to itemize the repairs so each item is clear and defensible. If you get a repair estimate without first talking with an attorney, you may be taking a significant risk that your total coverage, if any, will be less than adequate to repair your home.