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Where supplement margin actually leaks, and the specific moves that recover it.

A RocketLevel guide for estimators, supplement writers, project managers, and owners, backed by decades of experience in the trade. About a 7-minute read.

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Reviewed October 2026. Policy forms and state insurance rules vary and change. Use this page to know what to ask, then confirm with the policy itself and a construction attorney before you rely on it.

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Once you treat supplements as documentation rather than a fight, three advanced areas separate the shops that recover full margin from the ones quietly giving it back. One note before the codes: exact Xactimate selector spellings vary by version and region, so confirm the exact selector in your current price list before you write it.

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The three line-item battlegrounds

A desk reviewer is trained to look for scope inflation. Your job is to prove that what looks like inflation is mandatory, documented reality. Three line items get stripped most often:

• Supervisory labor (WTR LABS) versus technician labor (WTR LAB). Reviewers strip supervisor hours, arguing supervision is baked into overhead and profit. Overhead covers your bookkeeper and your warehouse, not an on-site project manager coordinating a six-person crew on a complex extraction. To hold the line, log specific daily supervisor notes: coordinated containment setup, managed equipment placement, ran the safety briefing.
• Equipment setup, takedown, and monitoring (WTR EQST). Reviewers pay the daily rental rate and quietly omit the labor to load, transport, deploy, and clean each unit. Carrying a heavy desiccant up three flights is real labor. Supplement WTR EQST on every piece your crew actually set, monitored and pulled, and let the equipment log prove the count. Skip it on a 30-unit commercial loss and you donate thousands in labor back. Bill it on units that never came off the truck and you have crossed from recovery into a false claim.
• Content manipulation (CNT MANIP). The estimate assumes an empty room. Your crew moved and wrapped the boardroom table or the living-room set to extract underneath. Itemize every major item moved, and tie it to a five-second video of the team moving the asset.

More margin hiding in the field

Three legitimate line items estimators routinely leave out:

• Equipment decontamination (WTR DECON). Cleaning and sanitizing air movers and dehumidifiers after a Category 3 (black water or sewage) job is a billable event. Capture it.
• Vertical material handling. When crews carry heavy equipment up multiple flights because an elevator is down or locked out, the extra labor is billable. Note why in the file.
• Floor and surface protection. Ram Board and sticky-poly laid over unaffected pathways is real material and labor. Plenty of crews lay it and forget to bill it. Include the protection line items in the supplement.

The Law and Ordinance lever

When you open a wall and find outdated, non-compliant wiring or plumbing, arguing that the water damaged it usually fails, because the pre-existing condition was not caused by the sudden loss. Ordinance or Law coverage is the right instrument. It is also the one place on this page where moving fast can cost your client more than it recovers, so the order of operations is not optional.

Ordinance or Law is not standard coverage. It is added to a commercial property policy by endorsement, the Insurance Services Office (ISO) form is CP 04 05, and it is written as three coverages that do not all behave the same way. Coverage A covers the value of the undamaged portion that has to come down, and it is included within the building limit rather than added to it, so it brings no money above that limit. Coverage B covers the cost of demolishing and removing that undamaged portion, under its own scheduled limit on top of the building limit. Coverage C covers the increased cost of construction to rebuild to current code, also under its own limit on top of the building limit, and B and C are sometimes written as one combined limit. Each of the three applies only if it is entered on the schedule, so a policy can carry one and not the others, or carry them at limits far below what a full code upgrade costs. Whether the ordinance has to be triggered by the covered loss depends on the specific wording.