After your insurance company issues an initial payment for your roof damage, a supplemental claim documents additional damage or costs the adjuster missed. This is how homeowners go from “partial approval” to “fully covered.”
Insurance adjusters process dozens of claims after every storm. They inspect from the ground, spend 30 minutes on your roof, and produce an estimate based on what they can see at that moment. But the real scope of damage often isn't visible until tear-off begins. Hidden deck rot, damaged underlayment, deteriorated flashing, and code-required upgrades are routinely missed in the initial inspection. A supplement claim captures everything the adjuster didn't see and submits it to your insurance company with the documentation they need to approve additional payment.