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Water mitigation vs restoration, and why Category 1, 2 and 3 change the estimate
Two words get used interchangeably on a water job and they are not the same work, not the same estimate, and often not the same company. The category of the water and the class of the loss then decide which line items belong on each. This is the vocabulary, as the estimate uses it.
Mitigation vs restoration
| Mitigation | Restoration (reconstruction) | |
|---|---|---|
| Goal | Stop the damage from getting worse and dry the structure | Put the building back |
| When | Hours after the loss, before the adjuster | After the structure reads dry and the scope is approved |
| Work | Extraction, tear-out of unsalvageable material, antimicrobial, drying equipment, monitoring | Drywall, insulation, flooring, trim, paint, cabinets, fixtures |
| Estimate | Its own estimate and invoice, backed by the drying log | A second estimate, often with items found after tear-out |
| Who | Restoration company | Same company's rebuild division, a GC, or trades |
Carriers review the two differently. Mitigation is judged against the drying log; reconstruction against the approved scope and photos of what was removed.
Category: how contaminated the water is
The IICRC S500 standard, which carriers and restoration companies both work from, sorts water by contamination. Category decides what can be dried in place and what must come out, and which protective and treatment items belong on the estimate.
| Category | Source | What it means for the job |
|---|---|---|
| 1 — Clean | Supply lines, faucet, appliance feed, rain through a roof (initially) | Most materials dryable in place if reached quickly; minimal tear-out; no antimicrobial required by default |
| 2 — Gray | Dishwasher and washer discharge, toilet overflow (urine only), aquarium, sump failure | Carpet pad and some porous materials removed; antimicrobial application; PPE for the crew |
| 3 — Black | Sewage, toilet overflow with solids, rising flood water, any water that sat long enough to grow | Porous materials removed (carpet, pad, drywall in contact, insulation); containment, negative air, full PPE, antimicrobial, disposal as contaminated |
Class: how much got wet and how hard it is to dry
| Class | Meaning | Effect on the estimate |
|---|---|---|
| 1 | Small area, little absorption, low-porosity materials | Few air movers, short drying |
| 2 | Whole room, carpet and pad, water wicked up walls under 2 ft | More equipment, longer drying, flood cuts |
| 3 | Water from above; ceilings, walls, insulation, carpet all saturated | Most equipment and days; most tear-out |
| 4 | Specialty drying: hardwood, plaster, concrete, crawlspaces | Specialty equipment (injection, desiccant), longest drying |
Which line items each one justifies
This is why category and class matter on paper: they're the justification for the items adjusters cut most often.
| Line item | Justified by |
|---|---|
| Antimicrobial application | Category 2 or 3 |
| PPE, containment, negative air | Category 3; Category 2 at the technician's documented judgment |
| Carpet pad removal | Category 2 or 3, or saturation per moisture readings |
| Drywall flood cut (2 ft or 4 ft) | Category 2/3 contact, or wicking above the dry line per meter readings |
| Insulation removal | Any wet insulation; it doesn't dry in place |
| Equipment days | The drying log: readings above the dry standard on each day billed |
| Specialty drying | Class 4 materials, documented |
| Contaminated-material disposal | Category 3 |
Written the other way around: an estimate that bills antimicrobial on a Category 1 loss, or five days of equipment with no log, is the one the adjuster cuts, and they're right to. How to document a supplement.
The drying log, and why it decides the mitigation invoice
Every mitigation estimate stands on one document: the drying log. It records, per day and per room, the moisture readings of the affected materials, the temperature and humidity, and which equipment was running. The adjuster reads it backwards: the last day a material read above the dry standard is the last day of equipment the carrier approves for that room. A log that stops two days before the equipment was picked up loses two days; a log with no readings at all loses the argument. Contractors: photograph the meter on the material with the date, every visit. Homeowners: ask for a copy of the log when the equipment leaves; it belongs in your claim file next to the estimate.
What the homeowner needs to know
- Mitigation starts before the adjuster has been out. That's expected; keep the drying log and photos.
- Expect two estimates and possibly two invoices. The deductible applies once per claim, not per estimate.
- Category is a technical finding, not a negotiating position. If the restoration company says Category 3, the source photo should show why.
- The structure is dry when the meter says so, not when the fans go quiet. Ask for the final readings.
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For contractors
Category, class, the moisture map and the drying log are the four documents an estimate is written from. Send them with the photos and sketch and restoration.claims writes the Xactimate estimate flat-rate, first one free.
Questions people ask
Is mitigation covered differently from restoration?
They're reviewed differently (mitigation against the drying log, reconstruction against the approved scope), and both fall under the same claim. Whether either is covered on a given loss is a policy question for your carrier.
Who decides the water category?
The restoration technician on arrival, following IICRC S500 criteria, documented with the source photo and the time elapsed. An adjuster can question it; the documentation is what settles it.
Does Category 3 always mean everything is torn out?
Porous materials in contact with the water (carpet, pad, drywall, insulation) are generally removed. Non-porous surfaces (tile, sealed concrete, metal) are cleaned and treated. The estimate lists which is which.
Can the same company do mitigation and rebuild?
Often yes; many restoration companies have a reconstruction division. The homeowner can also use a different contractor for the rebuild. The mitigation estimate stands on its own either way.
What is the IICRC?
The Institute of Inspection, Cleaning and Restoration Certification, which publishes the S500 (water) and S520 (mold) standards and certifies technicians. Carriers and restoration companies both reference its standards.