Engineering Reports on Insurance Claims: How to Read and Answer One

An engineering report arrives late in a claim and changes everything about it. The estimate stops moving, the adjuster stops calling, and a letter says the damage was caused by wear, workmanship or an older storm rather than by the one you reported. The report is usually attached — ten to thirty pages of it — and almost nobody reads past the conclusions.

The conclusions are the least useful part. What decides whether a causation opinion can be answered is everything in front of them: the question the engineer was asked, the documents the engineer was given, and the parts of your property the engineer actually looked at.

We are licensed Illinois public adjusters, not attorneys. Nothing here is legal advice, and your own policy governs your claim.

What is an engineering report on an insurance claim?

It is a written opinion from a licensed engineer, retained and paid by the carrier, about the cause of the damage the carrier is being asked to pay for. It answers a causation question. It does not decide coverage, it does not price the repair, and it carries no more weight than the examination behind it.

Carriers order one when cause is contested, when the amount is large, or when the property is old enough that wear is an available explanation. The engineer is engaged by the adjuster or a third-party administrator, and the assignment arrives as a letter containing a specific question — rarely "what is wrong with this roof", usually something narrower, and the narrowness is the point.

Illinois licenses professional engineers under the Professional Engineering Practice Act of 1989 (225 ILCS 325), and engineering documents are sealed and signed by the licensee responsible for them. Check the name and licence on the report against IDFPR's online licence lookup, then check whether the person who sealed it is the person who walked your roof — where a field technician made the site visit, the observations and the opinion belong to two different people, and the report normally says so if you read the first page and the signature block together.

How is a causation opinion actually written?

In sections, in a fixed order: the assignment, the documents reviewed, the site observations, weather research, a discussion tying observations to a cause, numbered conclusions, and a limitations paragraph. Each section narrows the opinion. By the time you reach the conclusions, they cover only what the earlier sections describe.

Section	What it tells you
Assignment / scope of work	The exact question the engineer was asked, and by whom — the boundary of everything that follows
Documents reviewed	What the engineer read before arriving, which is normally the carrier's file and not yours
Site observations	The date of the visit, what was examined, from where, and which surfaces were opened
Weather research	The data source, its distance from your property, and the date range that was searched
Discussion / analysis	The reasoning that connects the observations to a cause — the part that can be tested
Conclusions	The opinion itself, usually as numbered sentences, each one answerable separately
Limitations	The engineer's own statement of how far the opinion reaches
Appendices	Captioned photographs, measurements and data printouts — the evidence, and often the most useful pages

The limitations paragraph is the section people skip and the one that matters most. It usually says the opinions are based on the conditions observed on the date of the visit and on the information made available. That is the engineer telling you, in advance and in writing, that the opinion is only as wide as the inspection was.

Where does an engineering report most often stop short?

At the edge of what was examined. A report can speak only to the slopes that were opened, the rooms that were entered and the documents that were sent. A conclusion written as a general statement about the property is frequently an observation about part of it, and the observations section is where you find out which part.

What the report says	What to check in the report itself
"No hail damage was observed"	Where they looked. Which slopes and elevations, and which were opened with a test square rather than viewed
"Consistent with long-term weathering"	Whether anything in the report dates the condition. Wear and impact damage can both be present on the same roof
"Hail of sufficient size did not occur"	The weather source, its distance from the property, and the date range searched
"Mechanical damage from foot traffic"	Whether the marks are confined to walkable paths, or spread across slopes nobody walks
"A manufacturing-related condition"	Whether the finding covers every slope, and whether it explains the gutters, screens and soft metals as well
"Based on the documents provided"	The list. What the carrier sent, and what of yours — photographs, receipts, prior reports — it did not

Weather research deserves its own look. Reports commonly cite a nearby reporting station or a commercial hail-verification service. Both are estimates at your address, not measurements of it: a station fourteen miles away records what fell at the station. Ask which source was used, how far it sits from the property, and what dates were searched. A search run only on the reported date of loss will not find a storm three weeks earlier, which matters when the date on the claim was a best guess in the first place.

How do you answer an engineering report?

In writing, point by point, and on the record rather than on the conclusion. Ask for the complete report with its appendices, establish exactly what was examined, and set each conclusion beside the evidence that limits it. Where the money justifies it, retain your own engineer for the parts that were never inspected.

1. Ask for the complete report. What comes attached to a letter is sometimes the conclusions only. Request every appendix — captioned photographs, measurements, data printouts and the assignment letter — alongside the rest of your claim file.
2. Read the assignment before the conclusions. "Whether the hail event of 12 June caused damage to the roof covering" is a much narrower question than "what caused the condition of this roof", and an answer to the first is not an answer to the second.
3. List what was examined, surface by surface. Note what was viewed from the ladder, what was walked, and what was opened with a test square — commonly a marked ten-foot by ten-foot area in which impacts are counted. Anything absent from that list is outside the opinion.
4. Read the photographs against the conclusions. Appendix photographs are the carrier's own evidence. A captioned image of impact marks sits awkwardly beside a conclusion that none were identified.
5. Check the weather section. Source, distance, dates searched. Write down what it actually says rather than what the discussion summarises it as saying.
6. Reply in writing, one conclusion at a time. Claim number, date of loss, then each numbered conclusion with what limits it — and a specific request, which is usually a re-inspection covering the areas the report did not reach, with your representative present. What that inspection should cover is the same ground we set out for the carrier's inspection.

One lever that does not fit here: appraisal. The appraisal clause resolves the amount of the loss, not whether a loss is covered, so a causation denial is generally outside it — the distinction we set out in how the appraisal clause works. And if the denial letter says only "based on the engineering report", ask for the report. On a first-party claim denied or settled for less than was claimed, Illinois expects a reasonable written explanation within 30 days after the investigation and determination of liability is complete (50 Ill. Adm. Code 919.50).

A worked example

Illustrative arithmetic on a hail claim, not a result of ours. A June storm, a roof about fifteen years old. The field adjuster wrote nothing on the roof and referred the file out. Six weeks later an engineering report concluded that the roof surface exhibited long-term weathering and mechanical marks consistent with foot traffic, and that no hail-caused damage to the roof covering was identified. The claim was denied.

The homeowner asked for the report with all appendices. The observations section recorded test squares opened on the front and right slopes; the rear and left slopes were "observed from the ladder at the eave"; the detached garage was not examined; gutters, downspouts and window screens were not mentioned at all. The weather section cited a single station fourteen miles away, searched on the reported date only.

None of that shows the engineer was wrong about the front slope. It shows the opinion covered two slopes of four and no other structure. The written reply said exactly that, and asked for a re-inspection of the areas the report did not reach, with the carrier's adjuster present. Test squares were opened and photographed on the rear and left slopes, and the garage roof, gutters, downspouts and screens were documented.

The scope that came out of it: $21,400 for the roof, $2,760 for gutters and downspouts, $640 for window screens and $3,980 for the detached garage — $28,780 at replacement cost. Less $5,240 of depreciation and a $2,500 deductible, the first cheque was $21,040, with the withheld depreciation normally collected after the work is completed on a replacement cost policy.

Nothing in that sequence required a second engineer or an argument about science. It required reading the observations section and noticing that the report described a smaller inspection than the denial letter described.

When is your own engineer worth paying for?

When the disputed scope is large enough to carry the fee and the question is genuinely technical — structural movement, a roof system's failure mode, the path water took through a wall. On a small scope dispute, a documented re-inspection usually costs nothing and achieves the same thing faster.

An independent site visit and written report is a real expense, quoted per assignment, spent whether or not the opinion helps you, and in the ordinary case not recoverable from the carrier as part of the claim. Two questions are worth answering first.

• Is the disagreement about cause, or about scope and price? Only cause is an engineer's question. Missing line items and short quantities are answered with measurements, photographs and an itemised supplement — the ground covered in why a contractor's estimate comes in higher.
• Is there an area the carrier's engineer never examined? An opinion that covers ground the first report did not reach is far more useful than a second opinion on the same photographs of the same slope.

If you do retain one, retain them for a defined question and let the answer be what it is. An engineer whose report reads as an advocacy document persuades nobody, and a report you cannot show anyone is money spent twice.

What to do next

If a report has stalled your claim, get the complete document with its appendices, mark up the observations and weather sections, and reply in writing to each conclusion with a specific request. We handle hail damage claims, storm damage claims and wind damage claims across Illinois, and our claims process page shows how a scope is documented and negotiated. Where a client chooses our construction partner for the repair, that is always their choice and never a condition.

We will read the engineering report, the estimate and the letters at no cost and no obligation: send the declarations page, the report with its appendices, and whatever the carrier has released from the file. If we take the claim on, our fee is a percentage of the recovery, agreed in writing, capped by Illinois law and paid out of the settlement — nothing upfront, and no recovery, no fee. Reach us Monday to Friday, 8:00 AM to 5:00 PM, at (630) 297-8136 or through our contact page.