The adjuster came out. They walked the roof. They sent you a number. It felt low, but you're not sure — because you've never replaced a roof before, you don't know what things cost, and the paperwork is 14 pages long. So you're tempted to take it.
Here is what is actually happening, from a team that supplements and disputes insurance estimates on roofing claims across Western PA and Eastern Ohio every single week.
How Insurance Estimates Get Produced
Most insurance carriers use a software platform called Xactimate to price property damage claims. It is an industry-standard tool — your adjuster almost certainly used it. The software pulls regional pricing data and generates line-item estimates for materials, labor, and related costs.
The problem is not that Xactimate is dishonest. The problem is how carriers configure and use it. Adjusters can select pricing tiers. They can choose which line items to include. They can apply depreciation aggressively. They can leave off entire categories of required work. The estimate they produce is real in the sense that it was generated by real software — but the inputs and configurations that produced the number are entirely within their control.
Here is what routinely gets left off or underpriced on initial estimates, carrier by carrier:
Allstate: What They Typically Miss
Allstate in Western PA — we see this consistently — tends to use lower labor rates than current market and frequently omits or underpays on Overhead and Profit (O&P) on multi-trade claims. They are also aggressive about depreciation on older roofing systems, sometimes applying heavy depreciation even on impact-damaged shingles that were in good condition before the storm. We have supplemented Allstate claims by 30% to 60% above their initial figures in several Mercer County claims alone.
Erie Insurance: What They Typically Miss
Erie Insurance is the dominant carrier in Western PA — a huge percentage of homes in Mercer, Lawrence, and Butler counties carry Erie policies. Erie adjusters, in our experience, tend to do more thorough initial inspections than some carriers. But they commonly undercount impact density on shingles, miss the drip edge replacement required by current ICC building codes when re-roofing, and do not include Ice and Water Shield on eave extensions that now require it under updated code. The matching argument — if half the roof is damaged, the whole roof must match — is also frequently denied on first pass.
State Farm: What They Typically Miss
State Farm has become increasingly aggressive about requiring their own "preferred vendor" program, which steers homeowners toward carriers with pre-negotiated, below-market pricing agreements. Their initial scopes frequently exclude O&P, use lower labor rates, and depreciate materials more heavily than other carriers. We have seen State Farm estimates in Allegheny and Butler counties that were 40% below market replacement cost on straightforward asphalt shingle jobs. The supplement process works — but it requires persistence and documentation.
Progressive: What They Typically Miss
Progressive has expanded significantly in the Northeast Ohio market — Cuyahoga, Mahoning, and Trumbull counties. Their adjusters frequently use Xactimate at lower pricing tiers, omit the "tear-off" line item on second-layer removal, miss mechanical ventilation requirements triggered by code when doing a full replacement, and apply stiff ACV depreciation on mid-age roofing systems. Ohio's regulatory environment has some differences from Pennsylvania — depreciation on labor is a point of contention that Progressive pushes hard on in Ohio.
The Terms They Count On You Not Knowing
Actual Cash Value (ACV) is the depreciated worth of your current roof. Replacement Cost Value (RCV) is what it actually costs to replace it today. A policy that pays RCV gives you a depreciation holdback — paid when work is complete and receipts submitted. An ACV-only policy means you only get the depreciated number. Many homeowners don't know which they have. Check your declarations page.
Standard markup on general contractor work: 10% overhead + 10% profit = "double-ten" or 20% O&P. Carriers frequently omit this line item, arguing a single-trade roofer doesn't warrant it. In Pennsylvania, when a job involves multiple trades (roofing, gutters, exterior, or interior work) a GC role is legitimately required and O&P should apply. This omission alone can be worth $1,200–$4,000 on a mid-size replacement.
If storm damage affects part of your roof and the affected sections cannot be visually matched to the undamaged sections with currently available materials — a common situation with older or discontinued shingles — Pennsylvania law and most policy language supports replacing the full visible portion of the roof to restore uniformity. Carriers routinely deny matching on first pass. We push back on this every time it applies.
Current building codes in Pennsylvania require specific materials and installation methods on a re-roof that may not have been required when the original roof was installed. Drip edge, expanded Ice and Water Shield coverage, proper underlayment — these are code mandates. If your policy includes Ordinance or Law coverage (most do, in some amount), these upgrades should be covered. They frequently are not on initial estimates.
What "Supplement" Actually Means
A supplement is a revised scope submitted to the insurance carrier after the initial estimate, documenting items that were missed, underpriced, or incorrectly excluded. It is a normal part of the commercial roofing claim process — not confrontational, not fraudulent, not unusual. Most legitimate storm damage jobs are supplemented at least once.
When we submit a supplement on your behalf, we itemize every missing line, cite the specific Xactimate code for the item, provide material documentation, and reference applicable codes. We do not inflate — we document what is legitimate and required. The supplement either gets approved in whole, approved in part, or triggers a re-inspection or appraisal process. All of those outcomes are better than accepting an incomplete initial estimate.
The Appraisal Clause — Your Last Resort That Actually Works
If you and your carrier cannot agree on the amount of your loss, almost every homeowner's insurance policy in Pennsylvania and Ohio includes an appraisal clause. Each party selects a licensed appraiser. Those two appraisers select a neutral umpire. The umpire's agreement with either appraiser's finding becomes binding.
This process is underused by homeowners because they don't know it exists. In our experience, appraisal outcomes consistently favor the policyholder over the carrier's original offer — because an independent appraiser evaluating current market conditions and code requirements will reach different conclusions than an adjuster operating under carrier guidelines designed to control claim costs.
We can refer you to qualified public adjusters and appraisers in Western PA and Northeast Ohio if your claim reaches that stage.
Related reading: Our Storm Damage Process | How To Read Your Adjuster Estimate | What To Do After Hail