Why supplements matter
Almost every roofing insurance claim needs at least one supplement. Adjusters use Xactimate to estimate scope, and Xactimate's default line items rarely capture code-required upgrades, decking damage found on tear-off, or trade-standard items like ice-and-water expansion beyond eaves. Getting these approved is the difference between a job you profited on and one you barely broke even.
The problem isn't whether supplements are legitimate — most are. The problem is that adjusters approve on autopilot when the supplement uses language their software recognizes. Non-standard language gets rejected on the first pass and requires 2–3 rounds of back and forth. Meanwhile you're carrying the material cost.
This is the language that gets approved on the first pass.
Core vocabulary every roofer should know
- RCV (Replacement Cost Value): Full cost to replace at today's prices, without depreciation. This is what you actually bill.
- ACV (Actual Cash Value): RCV minus depreciation for the age of the roof. The initial insurance check to the homeowner is typically ACV.
- Recoverable Depreciation: The gap between ACV and RCV. Released to the contractor after completion, upon final invoice.
- Deductible: Homeowner's responsibility. Paid directly to the contractor at material delivery.
- Supplement: Additional scope submitted after the initial estimate, justified by code, discovery, or omission.
- Ordinance and Law coverage (O&L): Insurance coverage for code-required upgrades beyond the pre-loss condition. Often a separate policy limit.
- AOB (Assignment of Benefits): Homeowner signs benefits over to contractor. Legal status varies by state (banned in FL 2023 for property claims; still allowed in many states).
The 8 supplements adjusters approve most often
1. Additional decking replacement
Language that works: "Upon tear-off, discovered additional [X] sheets of 7/16" OSB decking damaged beyond serviceable condition (rot, delamination, fastener pull-through). Photos attached. Request supplement for material + labor per Xactimate line item RFG DECK 4x8 (locality: [ZIP])."
Attach 3–5 photos: wide shot showing the damaged area in context, close-up of the specific damage, photo with a measuring tape or reference object. This is 90% of the approval.
2. Drip edge upgrade (code)
Language that works: "IRC R905.2.8.5 (or local AHJ equivalent) requires drip edge at all eaves and rakes. Pre-loss condition had no drip edge at rakes. Installing per current code. Request supplement per Xactimate line RFG DRIP."
Cite the code section. Adjusters look this up in their software; if the code section is real, it flags as approvable.
3. Ice and water shield expansion
Language that works: "IRC R905.1.2 requires ice barrier from eave edge to 24" inside the exterior wall line in climate zones where average January temp is 25°F or less. Pre-loss condition had no ice barrier. Additional [X] sq ft required. Request supplement per Xactimate line RFG IWS."
4. Ventilation upgrade (code)
Language that works: "IRC R806.2 requires 1:150 net free ventilation area, or 1:300 with 40–50% intake and 50–60% exhaust. Pre-loss attic had [X] sq ft NFA; required per code is [Y]. Adding [ridge vent / static vents / soffit vents] to meet code. Request supplement per Xactimate line RFG VENT."
5. Step flashing replacement
Language that works: "Existing step flashing (aluminum) damaged during tear-off — unable to reuse per manufacturer installation guide (bent, corroded, wrong sizing for new shingle profile). Replacing per Xactimate line RFG FLSHSTEP. Photos attached."
6. Chimney flashing (counter + step)
Language that works: "Original counter flashing and step flashing at [side] chimney damaged / non-code-compliant. Replacing counter flashing (cut into mortar joint per IRC R905.2.8.3) and step flashing per manufacturer guide. Request supplement per Xactimate lines RFG FLSHCC + RFG FLSHSTEP."
7. Ridge cap upgrade to hip and ridge shingles
Language that works: "Manufacturer installation guide requires hip and ridge shingles matched to primary shingle product for warranty compliance. Xactimate estimate specified 3-tab ridge cap; matched hip and ridge product required. Request supplement to upgrade per manufacturer specification."
8. Detach and reset (D&R) items
Language that works: "Detach and reset required for [gutter apron / solar attachment / satellite dish / lightning rod / snow retention] to install roofing system per manufacturer guide. Request supplement per Xactimate line RFG D&R [item]."
How to structure a supplement submission
Every supplement should follow this exact structure:
- Claim number + property address at top
- Adjuster name + carrier name
- Reference to original estimate (date + total)
- Numbered list of supplement items with Xactimate line codes
- For each item: 1–2 sentence justification (code section, condition discovered, manufacturer requirement)
- Photo documentation attached with clear filenames matching item numbers
- Total supplement amount + revised total (original + supplement)
- Contractor contact info + license number
Phrases that get supplements rejected
- "Additional work required" — vague, no code reference
- "Discovered damage" — no photos, no line-item code
- "Best practice" — not code, adjusters ignore
- "Recommended by manufacturer" — needs the specific guide section
- "Industry standard" — not a defensible term for supplement approval
Adjusters have quotas. They approve what they can defend to their supervisor. Vague supplements get rejected because they can't be defended.
Common code sections to cite (2021 IRC baseline)
- IRC R905.1 — General requirements for roof coverings
- IRC R905.1.2 — Ice barrier requirement
- IRC R905.2.8.3 — Counter flashing at chimneys
- IRC R905.2.8.5 — Drip edge required at eaves and rakes
- IRC R806.2 — Attic ventilation requirements
- IRC R907 — Reroofing (over-lay restrictions, tear-off requirements)
Your state may reference IBC or a state-specific code. Cite whichever your local AHJ enforces. Colorado, Texas, and Florida have significant state-specific amendments — know yours.
State-specific gotchas
Florida (post-2023 SB 2A)
AOB effectively banned for property insurance. Homeowners must remain the party of interest. Structure your engagement letter and supplement submissions to reflect this — carrier payments go to homeowner, homeowner endorses to contractor.
Texas
Class 4 (impact-rated) shingles qualify homeowners for a premium discount from most carriers. Note the upgrade explicitly and provide the manufacturer's certification to the carrier — homeowners often don't know to submit for the discount.
Colorado
Hail-belt state with aggressive supplement culture. Adjusters are experienced. Weak supplements get rejected fast; strong ones get approved fast. Documentation quality matters more here than anywhere else.
California
Code often requires cool-roof or Title 24 upgrades in re-roofs. Cite Title 24, Part 6, Sec 110.8(i) when applicable. Wildfire zones require Class A assembly per Chapter 7A of the CBC.
Automate the routine parts
Adjuster approvals move faster when supplements are professional, correctly formatted, and cite code accurately. Most roofers hand-write these at 10pm after the tear-off day. The language repeats — you can systematize the 8 patterns above into templates.
ScopeCrafters pre-fills supplement language, Xactimate line codes, and IRC citations for the most common items. Combine that with your photo documentation and you're submitting first-pass-approvable supplements in 5 minutes instead of an hour.