Water damage glossary

What do restoration terms mean?

A restoration provider or an insurance adjuster handling a Dallas-area loss will use a short list of trade terms. Here they are in plain language, with more room given to slab foundations, attic equipment, hail, freezes and flood risk.

Air mover

A high-velocity fan set low to push dry air across wet floors and wall bases. It speeds evaporation, and a dehumidifier then pulls that moisture out of the room.

Air scrubber

A machine with a HEPA filter that captures dust and mold spores released while wet or moldy material is being torn out. Providers often run it inside a taped-off plastic work zone.

Backwater valve

A one-way flap in the home's sewer lateral. Wastewater leaves freely, but the flap closes if the public sewer surges and tries to push sewage back toward the lowest drain.

Category 1 water

Water from a clean source, such as a split supply line, a failed water heater tank or an overflowing sink. IICRC S500 lets many materials wet by it be dried in place when drying starts quickly.

Category 2 water

Grey water with some contamination, such as discharge from a washer, a dishwasher or a toilet that overflowed without solid waste. Soaked carpet pad is usually discarded.

Category 3 water

Grossly contaminated water. Sewage counts, and so does flood water that rises from a creek, a river or the street. Under IICRC S500, porous materials it touches are normally removed and replaced.

Condensate drain line

The narrow pipe that carries away the water an air conditioner pulls from the air. When an attic air handler sits above living space, a clogged line can fill the pan and soak the ceiling below.

Contents pack-out

Moving belongings out of a wet house for cleaning and storage while the building dries. Ask the provider for a written inventory of what left and what came back.

Curb valve

The utility-owned shutoff in the meter box near the street. If the shutoff at your house is stuck, the water utility can close this one.

Dehumidifier

A machine that takes water vapor out of the air. Restoration providers pick refrigerant or desiccant units sized to the volume of the wet space.

Dry log

The provider's ongoing record of moisture readings, room humidity and equipment placement. It shows when each material reached its dry goal and supports both the invoice and a claim.

Expansive clay soil

Soil that swells when wet and shrinks when dry. In regions with this kind of clay, seasonal movement under a slab foundation can stress buried plumbing and is one reason slab leaks happen.

Extraction

Pulling standing water out of carpet, pad and hard floors with pumps and extractor wands before drying equipment goes in. Starting with extraction shortens everything that follows.

Float switch

A small device that rises with water and cuts power to equipment. On an air conditioner it shuts the system off when the drain pan fills, before a clogged line can overflow into the ceiling.

Flood cut

A level cut through drywall made above the water line, often a foot or two higher. It opens the wall so soaked insulation can come out and the cavity can dry.

Flood zone

A designation on a FEMA flood map. Zones that begin with A, such as AE, are the 100-year floodplain, and shaded Zone X is the 500-year floodplain. Heavy rain can still flood a home that sits outside every zone.

Floodplain

Low ground along a creek or river that is expected to flood. The 100-year label describes odds in any single year, not a schedule. Texas sellers must disclose on a notice whether a property sits in one.

Floodway

The channel of a river or creek together with the strip of land beside it that must stay clear to carry flood flow. Texas seller disclosure forms ask separately whether a property lies in a floodway.

Galvanized pipe

Steel pipe with a zinc coating, found in older homes. The coating thins over time and the steel rusts from within, which can lead to pinhole leaks hidden in walls.

Hail damage

Impact harm to shingles, flashing, skylights and siding from hailstones. Bruised or cracked roofing may not leak right away, and water can show up as a ceiling stain after a later rain.

Main shutoff valve

The valve where the water line enters your house. Turning it off stops water to every fixture. Learn where it is, whether in a garage, a utility closet or by an outside wall, before an emergency.

Moisture mapping

Marking moisture readings on a sketch of the affected rooms. The map shows how far water spread beneath floors and inside walls, and later visits are compared against it.

Moisture meter

A handheld instrument that reads moisture content in drywall, wood and other building materials. A material counts as dry when its reading drops to the normal range for that material.

Mold assessor and remediator license

In Texas, the Department of Licensing and Regulation licenses people who assess mold and who carry out mold removal. Ask to see the license and look it up on the state search page.

Mold remediation

Taking out mold and the materials it ruined, then fixing the moisture source behind it. Work normally includes containment, cleaning or removal and drying the space.

NFIP

The National Flood Insurance Program, run by FEMA and the main source of residential flood policies in the country. Standard homeowners policies leave flood out, so this coverage is bought separately.

Public adjuster

A claims professional you pay, rather than the insurer, to prepare and negotiate your claim for a percentage of the settlement. The Insurance Information Institute notes fees can reach 15 percent, so vet one with the state insurance department.

Sewer and drain backup endorsement

An optional add-on to a homeowners policy that pays for water coming up through drains. Typical homeowners policies exclude sewer backup, and flood insurance does too.

Slab leak

A leaking supply or drain pipe that runs beneath or within a concrete foundation slab. Typical signs are a warm patch on the floor, the sound of running water with everything off, a jump in the water bill and damp flooring.

Structural drying

Drying the building itself, meaning framing, subfloor, drywall and wall cavities, and not only what you can see. Dehumidifiers, air movers and meter readings work together, and walls are sometimes opened to reach trapped water.

Subfloor

The layer under the finished floor. Water that gets beneath hardwood, laminate or vinyl soaks it, and it can cup, swell and grow mold if it stays wet.

Thermal imaging camera

A camera that shows surface temperature differences. Evaporating water cools a surface, so wet spots often appear colder, and providers use that to trace water. A moisture meter then confirms the finding.

Trinity River levee

The earthen embankments on both sides of the Trinity River through Dallas, built to hold back river flooding. They protect low ground near the river, but they do not stop rain from flooding streets and homes elsewhere.

Water mitigation

The first phase of a water loss: stop the source, take out standing water and start drying to limit spread. The rebuilding that comes later is usually called restoration.

Winter Storm Uri

The February 2021 freeze that kept much of Texas below freezing for days and burst pipes in many homes. The Texas Department of Insurance tracked its insured losses in a published report.

Xactimate

Estimating software that insurers and restoration companies use to price repairs line by line. If your estimate and the insurer's differ, comparing line items is the quickest way to find the gap.

Where do these definitions come from?

The water categories come from the IICRC S500 standard. Flood insurance wording follows FloodSmart.gov, and the floodplain zones match the list in the Texas seller's disclosure law. The drying advice rests on the EPA's mold and moisture guide. Texas mold licensing is described by the Texas Department of Licensing and Regulation, and the river levees by Wikipedia's Dallas article.

To see these terms in context, read emergency water damage restoration. The water damage guides list every other topic.