Before you go to that cost (and it can be costly), call the Department of Insurance and speak to a P&C complaint analyst. It's free. They can guide you through the complaint process. If you decide to use an engineer, make sure you get the right kind. There are a lot of different engineers who don't know anything about roofs. If you go with a PA, call the Department to make sure they're licensed in Illinois. Also, there are no laws governing how much they can charge. Their charge comes out of the payment from your insurance. It's NOT an additional amount the insurance company pays.
Yes, that is advisable
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