How to Write a Roofing Supplement That Gets Approved

A roofing supplement is a request for additional payment beyond the original insurance estimate. When your crew tears off an existing roof and discovers concealed damage (rotted decking, failed flashing, missing ice and water shield, deteriorated pipe boots), that damage wasn't visible during the initial adjuster inspection. The supplement documents this hidden damage and requests the insurance carrier to cover the cost of repairing it.

Supplements are one of the most overlooked revenue opportunities in roofing. Many contractors skip supplements or submit weak documentation that gets denied, even when the hidden damage is real.

The number one reason supplements get denied is insufficient documentation. An adjuster who wasn't on your roof needs to see clear evidence of concealed damage. If your supplement is just a line item in Xactimate with no photos, no description of where the damage was found, and no explanation of why it wasn't visible before tear-off, it's going to be denied.

Other common reasons for denial include submitting too late (weeks after the job), using vague descriptions like 'additional work needed,' not referencing building codes that require the repair, and failing to explain why the damage was concealed.

The most important step happens on the roof during tear-off. When your crew discovers hidden damage, they need to capture it immediately, before it gets covered up by new materials.

For each finding, document:

This is where most contractors fail. The crew finds damage, maybe takes a blurry photo, texts it to the office, and by the time someone writes up the supplement days later, half the details are lost or forgotten.

The supplement narrative is the written explanation that accompanies your photos and Xactimate line items. This is what the adjuster reads to understand what was found and why it needs to be covered.

A strong supplement narrative should include:

Avoid vague language. Instead of 'decking was damaged,' write 'Three sheets of 1/2-inch CDX plywood along the eave edge of the front slope were found to be severely deteriorated from prolonged moisture exposure. The wood was soft and crumbling upon removal of the existing shingles, indicating concealed water damage not visible during the initial inspection.'

Insurance adjusters work in Xactimate. If you want your supplement approved quickly, submit it in their language. Each type of damage maps to specific Xactimate line codes:

Include accurate quantities and measurements. A supplement that says '1 SQ of decking' when photos show three full sheets of plywood gets flagged. Be precise.

Package everything into a clean, professional report. The best supplement submissions include:

Email the report directly to the adjuster the same day you find the damage. Speed matters. The sooner you submit, the fresher the documentation, and the faster you get paid.

An adjuster reviewing a supplement is asking one question: can I verify this without a site visit? Anything that forces a phone call, a second inspection or a manager's sign-off slows the decision down or ends in a denial.

In practice they check four things:

Write every supplement so those four answers are on the first page. If the adjuster has to hunt for them, the supplement is at risk.

The narrative is the short written explanation that sits beside each photo. It should be factual, specific and free of opinion. A simple structure works well for every finding:

Example: During tear-off of the front slope, three sheets of OSB decking along the eave were found soft and deteriorated from prolonged moisture exposure. The damage was concealed beneath the existing shingles and underlayment. The decking cannot hold fasteners and must be replaced before new underlayment is installed. Photos 4 through 7 show the condition.

Notice what is missing: no blame, no guesses about how long the damage existed and no emotional language. Adjusters respond to facts.

Most roofing supplements come from the same short list. Knowing when each item applies keeps you from missing money and from claiming items that do not fit the job.

For line codes and units, use our Xactimate codes reference.

These three terms get mixed up, and using the wrong one causes delays.

A supplement is tied to the original claim number and the original cause of loss. If the damage you found was caused by something unrelated to the covered event, such as long-term neglect or an old leak, the carrier may not owe it. Document why the hidden damage connects to the covered loss, and be honest about what you cannot prove.

Submit the supplement as soon as the damage is documented, ideally the same day. Fresh photos, clear dates and an open job site all help. A supplement sent weeks later looks like an afterthought, and the evidence may already be covered by new underlayment.

After you submit:

Response times vary by carrier and by claim volume, especially after a major storm, so ask the adjuster what to expect instead of assuming. If a decision stalls, our guide on what to do when a supplement is denied or ignored covers the escalation steps.

Supplement Snap was built to solve this exact workflow. Your crew captures damage photos during tear-off, tags the damage type and roof area, and adds a voice note describing what they found (works in Spanish and other supported languages; Spanish voice notes are auto-translated to English).

The system uses AI to generate a professional supplement narrative from the field data. You can export an Xactimate-style CSV (a starting list of suggested line codes and approximate prices that you review and price yourself), and email a complete PDF report to the adjuster, all from the field, the same day.

One tap from the roof to a professional supplement submission. No more lost photos, forgotten details, or supplements that sit in the office for weeks.

For a complete list of Xactimate codes to use in your supplements, see our Xactimate codes reference guide.