question about insurance claim for roof replacement

[Andrew Hartigan]

We had hurricane damage on our personal roof and had a roofing company work with us through the insurance claim process.  Insurance company gave us 15k.  There was other areas of the house damaged but apparently we can use the whole check just towards the roof.  The roofing company told my wife that their price was based on insurance company amount rewarded as we never got a written estimate.  This seems strange to me and I am tempted to get more estimates as 15k for our roof seems steep.  Its a 2700 sq ft home with detached garage in Florida but its two stories and I can't imagine more then 2000sq ft of roof total.   Is this normal or should I demand detailed estimate and shop around?  I feel somewhat obligated as the company worked with us through the whole process but I also don't want to overpay.