Insurance adjusters are not roofers, and their first estimate is written fast. It is normal — even expected — for that initial scope to miss line items, undervalue others, or leave out code-required work. Supplements are a normal part of how contractors get paid for work the first scope left out. A supplement is simply how you ask the carrier to pay for the work the first scope left out.
What is a roofing supplement?
A supplement is an itemized request to the insurance carrier for additional line items, corrected pricing, or code-required components that the original estimate missed. It is written against the same scope, documented with photos and code references, and submitted with a short cover letter explaining why each item belongs.
Why the first scope almost always underpays
The adjuster works from a quick inspection and a standard template. Real roofs have details a template does not capture. The items most often missing or underpriced include:
- Code-required upgrades — ice-and-water shield, drip edge, proper fastening
- Detach and reset of items like satellite dishes, solar, or gutters
- Step and counter flashing at walls and chimneys
- Ridge, hip, and ventilation components
- Steep-slope and high-roof labor charges
- Overhead and profit (O&P) on multi-trade jobs
How to spot what's missing — fast
The fastest way to find the gaps is to put the carrier scope next to your own inspection, line by line. That is hard to do when the scope is a PDF. Convert it to a clean spreadsheet first: with every line in sortable columns — code, description, quantity, RCV, ACV — the missing and underpriced items are easier to spot, and you can build your supplement list from sortable columns instead of scrolling a PDF.
Documenting a supplement that gets approved
Approval comes down to documentation. For each added line, include:
- Photos of the condition or component
- The building code or manufacturer requirement that backs it
- The current month's price list — carriers update pricing monthly
- A short cover letter tying each item to the evidence
Timing matters too. You can supplement before installation, once you have inspected, and again after the work — before depreciation is released. Pursuing supplements at each stage is how contractors get paid for work the first scope left out.