Water damage glossary

What do restoration terms mean?

A restoration provider or an insurance adjuster handling a home near Acampo will use a short list of trade words. This glossary defines them in plain language and adds the California terms that come up with winter storms, high groundwater and earthquake rules.

Air mover

A high-velocity fan set low to blow air over soaked floors and wall bases. Moving air carries moisture off the surface, and dehumidifiers then pull it out of the room.

Air scrubber

A machine with a HEPA filter that captures dust and mold spores floating in the air during demolition of wet or moldy material. It is usually run inside plastic sheeting that seals off the work area.

Atmospheric river

NOAA describes these as long, narrow bands of moisture that carry tropical air toward higher latitudes. When one stalls over California in winter, the rain can overwhelm gutters, roofs, windows and street drains.

Backwater valve

A one-way flap installed on a home's sewer lateral. Wastewater leaves normally, but the flap closes when sewage from an overloaded public main tries to come back up through the lowest fixtures.

Category 1 water

Water from a sanitary source, such as a snapped supply line, a burst pipe or a tub left running. Under the IICRC S500 standard, many materials it wets can stay in place and be dried, provided work begins quickly.

Category 2 water

Grey water carrying some contaminants, such as discharge from a washing machine or dishwasher, or a toilet overflow with urine but no solids. Soaked carpet cushion is normally discarded.

Category 3 water

Grossly contaminated water, including sewage and flood water that rises out of a river, creek or street. The IICRC S500 standard treats porous materials that it touches as ones to remove and replace.

Condensate drain line

The narrow pipe that carries away the moisture an air conditioner pulls from the air. When the air handler is in an attic or closet, a clog lets the drain pan overflow and leave a stain on the ceiling or wall below.

Contents pack-out

Carrying furniture, clothing and other belongings out of a wet building so they can be cleaned and stored while the structure dries. Request a written list of what left and what was returned.

Curb valve

The water utility's shutoff, found in a small box near the street. The utility can close it when the valve at your house is stuck or broken.

Dehumidifier

A machine that removes water vapor from room air. Restoration providers bring commercial refrigerant or desiccant models rated for the volume of the wet space.

Dry log

The drying provider's daily notebook of moisture readings, humidity and equipment locations. It documents when each material reached its dry goal, and it backs up the invoice and any claim to your insurer.

Extraction

Removing pooled water from flooring, carpet and cushion using pumps, wands or weighted tools. It happens before drying equipment is placed, and doing it well cuts the length of the drying job.

Float switch

A small buoyant switch that opens an electrical circuit when water rises to a set level. On an air conditioner, it stops the unit when the drain pan is full, which keeps a blocked line from flooding the room below.

Flood cut

A level cut across a wall, made above the visible water line, that removes the soaked lower section of drywall. It exposes wet insulation and framing so both can be taken out or dried.

Floodplain

Low ground along a river or creek that is expected to go under water in a big flood. California Civil Code 1103 requires a seller who knows a home lies in a FEMA special flood hazard area (Zone A or V) to disclose it. A home outside the mapped zones can still take on water.

Galvanized pipe

Steel supply pipe with a zinc coating, common in older houses. Once the coating wears through, rust forms on the inside of the pipe and pinhole leaks can start inside the wall.

High water table

Groundwater that sits near the surface. The Wikipedia article on San Joaquin County calls the county a very low, flat basin with an exceptionally high water table, and says it tends to flood in spring when Sierra snowmelt runs off. Soggy ground and seepage deserve attention in that setting.

Levee

An embankment of earth that keeps a river or channel from spilling onto the land beside it. Levees guard farms and neighborhoods across the Central Valley and the Delta, and a major flood can top or breach them.

Main shutoff valve

The valve on the line where water enters the house. Turning it off stops water at every fixture. Homes put it in different places, such as outside by the meter, in a garage or in a utility closet, so locate yours ahead of time.

Moisture mapping

Marking moisture readings on a drawing of the affected rooms. The finished map shows how far the water spread beneath floors and inside walls, and each later visit is measured against it.

Moisture meter

A handheld instrument that reads the moisture content of drywall, wood and similar materials. A material is considered dry once the reading falls back to what is normal for that material.

Mold remediation

Taking out mold and the materials it has ruined, then correcting the dampness that let it grow. The California Department of Public Health says California has no licensing for mold remediators, so ask what training stands behind the crew.

NFIP

The National Flood Insurance Program, run by FEMA. Its policies are separate from homeowners insurance, because the California Department of Insurance says homeowners policies do not cover flood damage.

Public adjuster

A claims specialist you pay to prepare and present your claim in place of the insurer's own adjuster. California Insurance Code 15027 calls for a written contract that states the fee as a percentage, so read that page before you sign.

Sewer and drain backup endorsement

An optional add-on for homeowners policies that pays for water that rises out of drains and sewer lines. Many policies omit that cover unless it is added, so check your own policy with your agent.

Slab leak

A leak in a pressurized supply line or a drain that runs beneath or within a concrete foundation slab. Common clues are a warm patch on the floor, the sound of running water with every tap closed, a jump in the water bill and damp flooring.

Structural drying

Drying the parts of a building you cannot see, including framing, subfloors, drywall and the hollow spaces inside walls. Providers pair dehumidifiers and air movers with readings, and they may open a wall so air can reach trapped water.

Subfloor

The sheet or board layer under the finished floor. Water that slides under laminate, vinyl or hardwood soaks into it, and it can swell, warp or grow mold while it stays wet.

Thermal imaging camera

A camera that turns surface temperature into a picture. Wet spots often look cooler because evaporating water carries heat away, so providers use it to guess where water traveled, then check the guess with a moisture meter.

Water heater bracing

California Health and Safety Code 19211 requires existing residential water heaters to be braced, anchored or strapped against earthquake shaking. A tank that topples can tear its pipes loose and flood a garage or utility closet.

Water mitigation

The first stage of a water loss: shut off the source, take out standing water and begin drying so the damage stops spreading. Repair and rebuilding come afterward and are usually called restoration.

Xactimate

Estimating software used by many insurers and restoration firms to price repairs one line at a time. If your contractor's estimate and the insurer's differ, lining up the entries is often the quickest way to find the reason.

Where do these definitions come from?

The water categories follow the IICRC S500 standard. Insurance wording comes from the California Department of Insurance residential property claims guide, and the mold note from the CDPH mold FAQ. NOAA Research explains atmospheric rivers, the Seismic Safety Commission hosts the water heater bracing law, and the San Joaquin County article describes the flat basin and high water table.

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