How do I write a roof supplement to an insurance claim? (Step by step)
By Tom Kovack Jr., CEO · July 2, 2026 · Contractor guide
Across 556 documented roof claims, DumbRoof-built packages won 197 and recovered $7.25M.
Short answer
Write a roof supplement by auditing the carrier’s Xactimate scope line-by-line against your field measurements and photos, then documenting every missing, underpriced, or code-required item as a separate line with a code citation and photo proof. Submit it in the same estimating software the carrier used, itemized — never as a lump-sum “we need more.”
The workflow that gets paid
A supplement is a formal, evidence-backed request to correct an incomplete scope — not a negotiation. Reconcile measurements against an EagleView/aerial report (carriers routinely under-measure eaves, rakes, valleys, and ridge), run a line-item audit for missing components and wrong actions, code-attach each add, photo-prove each add, and submit in-kind in the same software the carrier used so the desk adjuster can approve line by line.
Typical recovery
Typical recovery on a properly built residential supplement runs $1,500–$3,000+ per job, driven mostly by omitted starter, ridge cap, ice & water, drip edge, steep/high charges, and O&P. DumbRoof generates the supplement and the Xactimate-style variance report automatically from your photos and measurements.
Code callouts
RCNYS R905.2.8.5
Drip edge required at eaves and rakes
Forces: Drip edge — full perimeter · Typical value: ~$4.21/LF
RCNYS R905.1.2
Ice barrier required (entire state is a designated zone in NY)
Forces: Ice & water barrier — full eave/valley coverage · Typical value: ~$2.24/SF
RCNYS R908.2
Deteriorated deck shall be replaced regardless of cause
Forces: Decking replacement at tear-off · Typical value: market SF rate
Code sections are RCNYS 2020 (New York); other states cite their adopted IRC edition. Xactimate values are representative and move by market and price-list date.
How to write a roof insurance supplement
Reconcile measurements
Pull the carrier scope next to an EagleView/aerial report. Every LF short on eaves, rakes, valleys, or ridge suppresses starter, drip edge, ice & water, and ridge-cap quantities downstream.
Line-item audit
Flag missing components, wrong actions (Detach-Reset billed where Remove & Replace is required), and unit-price errors.
Code-attach each add
Cite the exact section — drip edge at eaves and rakes (RCNYS R905.2.8.5), ice barrier (R905.1.2), deteriorated deck (R908.2). A carrier can argue “preference”; it cannot argue against code.
Photo-prove each add
Wide → mid → close-up, slope-labeled, date-stamped, tied to each line.
Submit in-kind
Deliver in the same software (Xactimate/Symbility) with F9 notes on each line, as one itemized packet, so the adjuster can approve line by line instead of rejecting a blob.
People also ask
What line items do adjusters most often miss?
Starter course, hip/ridge cap at its own rate, ice & water barrier, drip edge at eaves and rakes, step and headwall flashing, steep-slope and high-roof charges, detach-and-reset, permit fees, and debris haul-off.
How do I submit a supplement so it gets approved?
Submit in the same estimating software the carrier used, itemized, with an F9 code note, measurement source, price-list version, and a photo on each line — so the desk adjuster approves line by line instead of ordering a re-inspection.
How much does a roof supplement typically recover?
A properly documented residential supplement typically recovers $1,500–$3,000+ per job; complex or code-heavy jobs (decking, second-layer tear-off, matching-forced replacement) recover materially more.
Keep going
Educational information, not legal advice. Coverage depends on your specific policy and state law. Read your policy or consult a licensed professional. DumbRoof is documentation software you use on your own claim — it is not a public adjuster or law firm and does not act on your behalf.
Build the evidence file for your claim
Upload your inspection photos and measurements. DumbRoof generates a forensic causation report, an Xactimate-style estimate, and a scope comparison — in about 15 minutes.
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