The first carrier estimate is an opening number, not a verdict. The supplement is the documented request that closes the gap between what the adjuster wrote and what the roof actually needs, and in restoration it is routinely the difference between a thin job and a healthy one. This guide covers what belongs in a supplement, how to document it so approval is boring, and the follow-up cadence that gets checks released.
Operational guidance for contractors, not legal advice. State rules on claim conduct vary; the licensing line discussed below is real.
Why carrier estimates start low
Not conspiracy, mechanics: the field adjuster walked the roof once, wrote it in Xactimate against a regional price list, and moved to the next file. Anything they did not see, measure or think to include is not in the estimate. The supplement exists because the system expects it: you are the party standing on the roof with time to look.
The items most often missing
- Code items: ice and water shield, drip edge, ventilation. Where local code requires them, they belong in the scope, cited to the code section.
- Steep, high and access charges for the slopes that earn them.
- Additional tear-off layers discovered on the roof or in the attic.
- Starter strip and ridge cap as their own line items where warranted, not bundled into waste.
- Flashing: step, chimney, wall. Reused flashing on a new roof is a workmanship problem, not a savings.
- Hidden damage found at tear-off: rotten decking, crushed vents, saturated insulation. Photograph the day it is found.
Anatomy of a supplement that gets paid
A desk adjuster approves supplements that make approval easy. That means:
- A one-page cover letter: claim number, property, what is requested, the total, and the list of attachments. Factual tone, no outrage.
- An itemized list, each line with a quantity, a unit price and a reason.
- A photo for every disputed line, labeled, with something for scale. Organized by slope, not a camera-roll dump.
- Code citations where code drives the item: section number, quoted text.
- The measurement: a verified takeoff resolves quantity disputes before they start.
- Storm evidence when causation is in play: verified NOAA data for the date of lossbeats "there was a big storm" every time.
The follow-up cadence
Submitted is not done. Supplements die in queues, not in denials: the file went quiet, nobody called, ninety days passed. Work a fixed cadence: confirm receipt within days, follow up on a schedule, log every contact with a name, a date and what was said, and escalate politely when the clock justifies it. This is exactly the kind of calendar work software should own; RoofGrid tracks the supplement workflow per claim with the deadline engine watching the statutory windows underneath.
After approval: the money has stages
An approved supplement updates the claim total, but on replacement-cost policies part of that money is still depreciation held back until completion. Invoice for the depreciation release with completion photos and the final invoice, and track it per claim like the receivable it is. The most expensive supplement is the approved one nobody ever collected.
Common questions
How long does a roofing supplement take to get approved?
Anywhere from days to months, and the spread is mostly about quality and follow-up. A clean, itemized, photo-documented supplement with code citations gets approved faster because the desk adjuster can say yes without sticking their neck out. After submission, follow up on a fixed cadence and log every call with a name and a date.
What are the most commonly missed items in carrier roof estimates?
Code-required items lead the list: ice and water shield, drip edge, and ventilation where local code requires them. After that: steep and high charges, tear-off of additional layers, starter and ridge cap as separate line items, and flashing replacement. None of these are exotic; they are just absent until someone asks with documentation.
Can I supplement after the job is finished?
Hidden-damage supplements discovered during tear-off should be documented the day they are found: photograph the rotten decking with something for scale, stop, and notify before proceeding where the policy requires it. Timing rules on supplemental claims vary by state and policy, and some states have hard statutory windows, so know your deadline before you rely on it.
Is supplementing the same as public adjusting?
No, and the line matters legally. Documenting damage, providing your estimate and requesting payment for scope you are contracted to perform is contractor work. Negotiating the coverage itself on behalf of the insured is public adjusting, which is licensed in most states. When a claim needs a coverage fight, bring in a licensed PA or attorney instead of becoming an unlicensed one.