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. The average supplement recovers $1,500–$3,200 per job, yet most contractors either skip them entirely or submit weak documentation that gets denied.

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.

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 any language; 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-ready CSV with the correct line codes and pricing, 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.