It really depends upon how clear, concise and authoritative your report comes across to the insurer. Your report can't really harm the insured's claim even if it were to contradict the insured's position. In which case, all the insured would have to do is claim that they found out you weren't licensed and all the contracts, proposals, papers, and reports prepared and submitted by you are effectively tossed out the door.
Alternatively, you'll sound like a clear and concise roofing authority and they will act accordingly. Generally, if the insurer knows that you are not licensed and you are taking a hard position against them, they will certainly address the license. From the insurer's perspective it is a credibility factor.
Claimlaw