A roof insurance supplement is a request for more money on a claim that is already open. You file it when the first estimate left out damage, labor, materials or code-required work. It is not a new claim. It adds to the one you have.
This guide explains when a supplement makes sense, what goes into one, and what it cannot do. It also covers Wisconsin rules that apply to roof claims.
TL;DR
- A supplement asks the insurer to revise its estimate. It does not change what your policy covers.
- Common triggers: hidden damage found at tear-off, missed line items, wrong quantities, and code-required work.
- Strong supplements rest on photos, measurements, a line-by-line estimate and a written reason for each item.
- No supplement guarantees a full roof, upgrades or your contractor's price.
- In Wisconsin, read any contract carefully. Never accept a promise to rebate your deductible.
Table of Contents
- What a roof insurance supplement is
- Supplement, new claim or re-inspection
- What a supplement cannot do
- Why the first check can look low
- When to file a supplement
- How to build a supplement: step by step
- Wisconsin: what to do before you sign anything
- Emergency repairs while the claim is open
- Our perspective
- What to check in the estimate before you sign a roofing contract
- How AM Exteriors can help
- Frequently asked questions
- Sources
What a roof insurance supplement is
An adjuster writes the first estimate after one inspection. That inspection happens before the old roofing comes off. Some damage cannot be seen from the ground or the surface.
A supplement is an itemized request for additional claim funds. Wisconsin's Office of the Commissioner of Insurance (OCI) explains in its guide to settling property insurance claims why detailed records and a clear inventory of damage matter. Adjusters need to know about visible and possibly hidden damage.
A supplement usually covers one or more of these:
- Damage found after tear-off, such as rotted decking.
- Items the estimate left out, such as drip edge, flashing or vents.
- Quantities that were measured wrong.
- Work the local building code requires.
- Steps the shingle manufacturer requires for the installation to be valid.
A contractor's guide to roof supplements from a roofing materials maker describes the same pattern. The first scope often falls short of a code-compliant repair.
Supplement, new claim or re-inspection
These three get mixed up. They are different.
| Term | What it is | When it applies |
|---|---|---|
| Supplement | A request to add items to an open claim | Missed or hidden items, quantities, code work |
| New claim | A separate report of a separate loss | A different storm or event |
| Re-inspection | A second look at the damage | You or your contractor dispute whether damage exists |
If the dispute is about whether the storm damaged the roof at all, a supplement is the wrong tool. Ask for a re-inspection. If the insurer found damage but priced it too low or left out steps, a supplement fits.
What a supplement cannot do
A supplement does not change your policy. Coverage depends on the policy and the cause of the loss.
OCI says that a storm-damaged portion of a roof is generally covered according to the policy. It also says a worn-out roof without covered damage is the homeowner's responsibility. See OCI's homeowner's insurance FAQ.
Regulators add another point. An insurer may not owe replacement of an undamaged part of the roof just because another part was damaged. The Texas Department of Insurance frames roof claims as questions of policy and evidence. Is the cause of loss covered? What does the policy promise? What damage is documented? Is the work needed to restore the property?
So a supplement does not guarantee:
- A full roof replacement.
- Premium upgrades.
- Payment of your contractor's preferred price.
Why the first check can look low
A low first payment is not always a denial. Check two things before you assume the insurer underpaid.
Replacement cost or actual cash value. Replacement-cost coverage can pay to repair or replace covered damage, subject to limits, conditions and the deductible. Actual-cash-value coverage subtracts depreciation. The Maryland Insurance Administration notes that the type of coverage changes what the homeowner owes.
Deductible. Wind and hail deductibles can be separate from your standard deductible. Look at your declarations page.
If your policy holds back depreciation, you may be able to recover it after the work is done. That is a different process from a supplement. Check the policy for a deadline. The Iowa Insurance Division lists settlement method, deductible, depreciation, materials, labor, permits and removal as factors in what gets paid.
When to file a supplement
File one when you can point to a specific gap. Typical situations:
- The crew opens the roof and finds more damage. Soft or rotted decking is the usual example.
- The estimate lacks a required component. Check drip edge, underlayment, flashing, ventilation and ice-and-water protection where required.
- The measurements are off. Roof pitch, complexity and number of layers change the quantities.
- Code or the manufacturer requires extra work. Permits and inspections may add cost.
- Related areas were damaged. Gutters or siding hit by the same storm may belong on the claim.
Do not file a supplement to pad a claim. Every item needs a reason you can show.
How to build a supplement: step by step
1. Keep the original estimate
Get the insurer's estimate in writing. You need it to compare line by line.
2. Document before and during the work
OCI's storm guidance, After a Storm Hits, says to photograph and video damage from multiple angles. It also says to list damaged property, keep receipts and keep estimates. Take photos at tear-off too. Photos of the decking before it is covered are your best evidence.
3. Compare scope to estimate
Your contractor writes the full scope of work. Set it next to the insurer's estimate. Mark each item that is missing, undercounted or underpriced.
4. Explain every added item
For each item, include:
- Annotated photos.
- Measurements.
- A revised line-item estimate.
- Code references.
- Manufacturer installation requirements.
- Permit information.
- A short written reason the item is necessary.
Contractors often write estimates in Xactimate, an industry pricing tool. The insurer's policy and the documentation still control coverage.
5. Submit it to the adjuster
Send the package to the adjuster on your claim. Ask for a written response. Keep a log of dates and names.
6. Follow up
The insurer may approve all items, some of them, or none. It may ask for more detail or send the adjuster back out. Answer promptly and keep everything in writing.
7. Escalate in the right order
If the matter is unresolved, OCI advises going to the insurer or agent first. After that you can contact OCI. OCI's consumer page lists complaint help at 1-800-236-8517 and at oci.wi.gov/complaints.
Wisconsin: what to do before you sign anything
Storm seasons bring door-knockers and pressure to sign quickly. Wisconsin guidance warns against both.
A recent state law, 2025 Wisconsin Act (Senate Bill 531), creates section 632.11 of the statutes. It deals with residential contractors and post-loss assignments of rights or benefits after a catastrophe such as a hail storm or windstorm. Confirm the current text and its requirements for your project before you sign.
Practical rules for any contract tied to an insurance claim:
- Do not accept a promise to rebate your deductible. It can create legal and payment problems.
- Read assignment language. An assignment can transfer your right to be paid. Know what you are signing.
- Ask questions first. Call your insurer or a qualified Wisconsin professional before you authorize anyone to represent you or receive payment.
- Choose the contractor yourself. Do not sign under pressure. Take time to read the agreement.
- Be wary of broad promises. A contractor who says they will handle everything with the insurer is promising something the insurer controls.
If you are unsure about a contract, an attorney licensed in Wisconsin can review it. For questions about your policy, call your insurance agent or OCI.
Emergency repairs while the claim is open
You may protect the home from more damage. Tarp the roof or cover openings. Then:
- Photograph the damage first.
- Keep every receipt.
- Keep damaged materials when it is safe to do so.
- Hold permanent repairs until the adjuster has assessed the damage.
This follows the OCI storm guidance linked above. If you wait on the adjuster, you protect your claim.
Our perspective
We have worked on roofs in Southeast Wisconsin for over 25 years, and the company is owner-operated. Here is what we see.
Most roof failures come from poor workmanship, not from the shingle. The same is true of claims. The homeowners who have the smoothest time are the ones who have a clear record. They have photos from the first day, a written scope and a contractor who documents each step.
We do not treat a supplement as a contest with the insurer. It is a paperwork question. Does the evidence support the item? If yes, we document it. If no, we say so.
We also give honest advice on repair versus replacement. Not every storm-hit roof needs to come off. Some need a repair. We tell you which one it is, even when that is the smaller job.
Our crews photograph the work and keep records, and we stay in touch during the project. That documentation is what a supplement needs. The best time to start it is before the first shingle comes off.
— Heather
What to check in the estimate before you sign a roofing contract
Compare the approved estimate with the proposed scope. Look for:
- Roof type and quantities.
- Tear-off and disposal.
- Flashing.
- Underlayment.
- Ventilation.
- Drip edge.
- Ice-and-water protection where required.
- Permits.
- Gutters or siding affected by the loss.
- Depreciation and the deductible.
- Any deadline for recovering depreciation.
Write down every difference. Those differences are the starting list for a supplement, if one is needed.
How AM Exteriors can help
We handle roofing, siding, windows and gutters in Southeast Wisconsin, including Dodge, Washington, Fond du Lac and Ozaukee counties. For storm damage, we offer insurance claim assistance, a free hail damage roof inspection and storm damage roof repair.
If you need the full roof, see our roofing services. Roof replacement is published at $7,500 to $18,000. Your price depends on the roof and the scope. For a step-by-step view of filing, read our storm damage insurance claim guide.
Frequently asked questions
Does a supplement mean a new claim?
No. A supplement adds to a claim that is already open. A new claim is for a separate loss, such as a different storm. Your deductible does not usually restart for a supplement, but check your policy or ask your insurer.
Will insurance cover a 20-year-old roof?
It depends on the policy and the cause. Insurers generally do not pay for an old, worn-out roof without covered damage. If a storm damaged it, the covered damage is handled under your policy terms. Replacement-cost and actual-cash-value policies pay differently.
How do I start a roof insurance claim in Wisconsin?
Contact your insurer promptly. Photograph and video the damage from several angles, and list what is damaged. Make temporary repairs to prevent more damage, and keep the receipts. Then let the adjuster assess permanent repairs.
Can my roofer negotiate with my insurer for me?
A roofer can provide documentation and an estimate. Be careful with promises to negotiate on your behalf. Wisconsin's recent law addresses representation and assignment of benefits in residential catastrophe repairs. Read the contract, and ask your insurer or a qualified Wisconsin professional before you authorize anything.
Are roofing policy add-ons the same as a supplement?
No. A policy add-on, called an endorsement, changes your coverage before a loss. A supplement is filed after a loss, under the coverage you already have. Ask your agent which endorsements apply to your roof.
Sources
- Consumer's Guide to Settling Property Insurance Claims, Wisconsin OCI
- After a Storm Hits, Wisconsin OCI
- Frequently Asked Questions: Homeowner's Insurance, Wisconsin OCI
- Wisconsin OCI consumer complaint page
- 2025 Wisconsin Act (Senate Bill 531)
- Insurance and your roof, Texas Department of Insurance
- Roof replacement, Maryland Insurance Administration
- Roof coverage options, Iowa Insurance Division
- How to Supplement a Roof Insurance Claim, CEDUR