Public Adjusters know laws and coverage that mandate insurance companies to pay claims. For example, if you have a roof leak and it leaks into your drywall, did you know that you, the insured, are entitled to O and P, 10 and 10 or also know as the overhead and profit that would be paid to a general contractor for overseeing your project. Case law says you are entitled to this money. See an explanation here:
Merlin Law Blog about Trinindad Case. Or the 25% rule which states that if, for example, your roof sustained damage and over 25% requires repair, the whole thing should be replaced.