Water Damage Restoration Glossary
A comprehensive guide to the terminology, equipment, and processes used in professional water damage restoration. Whether you are filing an insurance claim or trying to understand a restoration estimate, this glossary will help you make informed decisions.
Air Mover
A high-velocity fan used during the structural drying process to increase airflow across wet surfaces. Air movers accelerate evaporation by directing concentrated streams of air over walls, floors, and other moisture-affected materials.
Antimicrobial Treatment
The application of chemical agents to surfaces and materials to prevent or inhibit the growth of bacteria, mold, and other harmful microorganisms after water damage. Antimicrobial treatments are an essential step in preventing secondary damage during restoration.
Learn about our mold remediation services→Asbestos Abatement
The process of identifying, removing, or encapsulating asbestos-containing materials (ACMs) that may be disturbed during water damage restoration. Older buildings may contain asbestos in insulation, floor tiles, or pipe wrapping, requiring licensed specialists for safe removal.
Biohazard
Any biological substance that poses a threat to human health, including sewage, blood, and other bodily fluids. Water damage involving biohazards (Category 3 water) requires specialized cleanup procedures, personal protective equipment, and proper disposal methods.
See our sewage cleanup services→Board-Up Services
Emergency services to secure a property after damage by covering broken windows, doors, or openings in the structure with plywood or other materials. Board-up services protect against weather, vandalism, and further damage while restoration work is planned.
Learn about our emergency services→Category 1 Water (Clean Water)
Water from a sanitary source that does not pose a substantial health risk. Examples include broken supply lines, overflowing bathtubs with no contaminants, and rainwater intrusion. Category 1 water can degrade to Category 2 or 3 if left untreated.
Category 2 Water (Gray Water)
Water that contains significant contamination and has the potential to cause illness or discomfort. Sources include washing machine overflow, dishwasher discharge, and toilet overflow with urine but no feces. Requires more extensive decontamination than Category 1.
Category 3 Water (Black Water)
Grossly contaminated water containing pathogenic agents, toxins, or other harmful substances. Sources include sewage backups, flooding from rivers or streams, and standing water that has supported microbial growth. Category 3 water requires the most rigorous cleanup and safety protocols.
See our sewage cleanup services→Containment
The use of physical barriers such as polyethylene sheeting and negative air pressure to isolate an affected area during restoration. Containment prevents cross-contamination of mold spores, asbestos fibers, or other contaminants from spreading to unaffected areas of the property.
Content Restoration
The process of cleaning, deodorizing, and restoring personal belongings and contents affected by water, fire, or mold damage. Content restoration may include ultrasonic cleaning, ozone treatment, dry cleaning, and specialized techniques for electronics, documents, and artwork.
Crawl Space Drying
Specialized drying techniques applied to the crawl space beneath a building. Crawl spaces are particularly vulnerable to moisture accumulation, which can lead to structural damage, mold growth, and poor indoor air quality if not properly addressed.
Dehumidification
The process of removing excess moisture from the air using industrial-grade dehumidifiers. Dehumidification works in conjunction with air movers to create optimal drying conditions and is essential for preventing mold growth and secondary damage after water intrusion.
Desiccant Dehumidifier
A type of dehumidifier that uses a chemical desiccant material to absorb moisture from the air, rather than a refrigerant coil. Desiccant dehumidifiers are effective in low-temperature and low-humidity environments where refrigerant (LGR) dehumidifiers may be less efficient.
Dry-Out
The comprehensive process of removing moisture from a water-damaged structure using a combination of air movers, dehumidifiers, and monitoring equipment. A successful dry-out returns all affected materials to their pre-loss moisture content levels.
Learn about our water damage restoration process→Drying Chamber
A sealed environment created using containment barriers to concentrate drying efforts in a specific area. By controlling airflow, temperature, and humidity within a drying chamber, technicians can achieve faster and more effective drying of heavily saturated materials.
Emergency Mitigation
Immediate actions taken to stop or reduce further damage to a property after a disaster. Emergency mitigation includes water extraction, board-up services, tarping, and temporary power to stabilize the property before full restoration begins.
Our 24/7 emergency response team→EPA (Environmental Protection Agency)
The U.S. federal agency responsible for environmental regulations, including guidelines for mold remediation, lead paint, asbestos, and indoor air quality. Restoration professionals follow EPA standards to ensure safe and compliant cleanup practices.
Extraction
The process of physically removing standing water from a structure using truck-mounted or portable extraction equipment. Extraction is typically the first step after emergency assessment and is critical for minimizing damage and reducing drying time.
Flood Cut
The controlled removal of drywall, typically 12 to 24 inches above the visible water line, to allow for inspection and drying of the wall cavity. Flood cuts expose insulation and framing to air circulation, which is necessary for proper structural drying and mold prevention.
Flood Insurance (NFIP)
Insurance coverage for flood damage provided through the National Flood Insurance Program (NFIP), administered by FEMA. Standard homeowners insurance does not cover flood damage, so properties in flood-prone areas require a separate NFIP policy or private flood insurance.
Free Estimate
A no-obligation assessment of damage and projected restoration costs provided at no charge to the property owner. Moisture Pro offers free estimates for all restoration services so homeowners can understand the scope and cost of repairs before committing.
Request your free estimate→Gray Water
See Category 2 Water. Gray water contains some level of contamination from sources such as washing machines, dishwashers, or clean toilet overflows. While not immediately dangerous, gray water can support microbial growth if untreated and may escalate to black water conditions within 48 hours.
HEPA Filtration
High-Efficiency Particulate Air filtration that captures 99.97% of particles 0.3 microns or larger. HEPA filters are used in air scrubbers and negative air machines during mold remediation and other restoration activities to maintain safe indoor air quality.
Humidity Control
The management of indoor relative humidity levels during and after restoration to prevent secondary damage and mold growth. The IICRC recommends maintaining indoor relative humidity below 60% during drying, with an ideal target of 40-50%.
Hydroxyl Generator
A device that produces hydroxyl radicals to neutralize odors, bacteria, viruses, and volatile organic compounds (VOCs) in the air. Unlike ozone generators, hydroxyl generators are safe to use in occupied spaces and are commonly used for deodorization during restoration.
IICRC (Institute of Inspection, Cleaning and Restoration Certification)
The nonprofit certifying body that sets the standards for the restoration industry, including the S500 (water damage), S520 (mold remediation), and S540 (fire/smoke damage) standards. IICRC certification is the gold standard for restoration technicians and companies.
Industrial Dehumidifier
A commercial-grade dehumidifier capable of removing significantly more moisture than consumer models. Industrial dehumidifiers used in restoration can extract 30 to 200+ pints of water per day and are essential for drying large or severely damaged areas.
Infrared Camera
A thermal imaging device that detects temperature variations in building materials to identify hidden moisture. Wet materials appear cooler on an infrared camera due to evaporative cooling, allowing technicians to locate water damage behind walls, under floors, and above ceilings without destructive investigation.
Insurance Adjuster
A representative of the insurance company who assesses property damage, reviews the restoration scope of work, and determines the amount the insurer will pay for covered losses. Restoration companies like Moisture Pro work directly with adjusters to document damage and streamline the claims process.
Loss Assessment
The initial evaluation of a damaged property to determine the extent and cause of the damage, the affected materials, and the required restoration scope. A thorough loss assessment includes moisture readings, photographic documentation, and a written scope of work.
LGR Dehumidifier (Low-Grain Refrigerant)
An advanced type of refrigerant dehumidifier that uses a double cooling coil system to achieve lower grain depression (the difference between incoming and outgoing air humidity). LGR dehumidifiers are more energy-efficient and effective at removing moisture in the later stages of the drying process when humidity levels are lower.
Mitigation
Actions taken to reduce or prevent further damage to a property after a loss event. Mitigation is distinct from restoration in that it focuses on stabilizing the situation and preventing additional harm, while restoration focuses on returning the property to its pre-loss condition.
Moisture Mapping
The process of documenting moisture levels throughout a damaged structure using moisture meters and thermal imaging cameras. Moisture maps are created at the beginning of the drying process and updated regularly to track progress and ensure all affected areas are properly dried.
Moisture Meter
A diagnostic instrument used to measure the moisture content of building materials such as wood, drywall, and concrete. Pin-type meters measure electrical resistance between two probes, while pinless meters use electromagnetic signals to detect moisture non-invasively.
Mold Remediation
The process of identifying, containing, removing, and preventing mold growth in a building. Professional mold remediation follows IICRC S520 standards and includes containment setup, HEPA filtration, physical removal of contaminated materials, antimicrobial treatment, and post-remediation verification.
Learn about our mold remediation services→Mold Spores
Microscopic reproductive cells produced by mold fungi that travel through the air. Mold spores are present everywhere in the environment but become problematic when they land on moist surfaces and begin to grow. After water damage, conditions are ideal for mold growth, which can begin within 24 to 48 hours.
Negative Air Machine
A portable air filtration unit equipped with HEPA filters that creates negative air pressure within a containment area. By exhausting filtered air outside the containment, negative air machines prevent contaminated air from spreading to unaffected areas during mold remediation or other hazardous cleanup work.
NFIP (National Flood Insurance Program)
A federal program administered by FEMA that provides flood insurance to property owners, renters, and businesses in participating communities. The NFIP offers coverage for building and contents damage caused by flooding, which is not covered by standard homeowners insurance policies.
Odor Removal
The elimination of persistent smells caused by water damage, mold, smoke, or sewage using professional techniques. Methods include thermal fogging, hydroxyl generation, ozone treatment, and antimicrobial application to neutralize odor-causing compounds at the molecular level.
Ozone Treatment
A deodorization method that uses ozone (O3) gas to oxidize and eliminate odors, bacteria, and mold. Ozone is a powerful oxidizer but must be used in unoccupied spaces due to health risks. After treatment, the space must be thoroughly ventilated before reoccupancy.
Pack-Out
The process of carefully inventorying, packing, and removing personal belongings from a damaged property for off-site cleaning, restoration, and storage. A pack-out allows restoration crews full access to the structure for drying and repairs while protecting the homeowner's contents.
Personal Protective Equipment (PPE)
Specialized clothing and equipment worn by restoration technicians to protect against health hazards including contaminated water, mold spores, asbestos, and chemical exposure. PPE may include respirators, gloves, protective suits, goggles, and rubber boots depending on the hazard level.
Pre-Loss Condition
The state of a property and its contents before the damage event occurred. The goal of restoration is to return the property to its pre-loss condition. Insurance claims are typically adjusted based on the pre-loss condition of the property, not upgrades or improvements.
Psychrometry
The science of measuring and analyzing air temperature, humidity, and moisture relationships. Restoration professionals use psychrometric principles and tools (such as thermo-hygrometers) to calculate drying goals, monitor progress, and determine when a structure has reached acceptable dryness levels.
Reconstruction
The rebuilding phase of restoration that involves replacing damaged structural elements, drywall, flooring, cabinetry, and other building components. Reconstruction begins after mitigation and drying are complete and aims to restore the property to its pre-loss condition or better.
See our property reconstruction services→Relative Humidity
The percentage of moisture in the air relative to the maximum amount the air can hold at a given temperature. Restoration professionals monitor relative humidity to guide drying operations, with a goal of maintaining levels below 60% to prevent mold growth.
Remediation
The process of correcting or reversing environmental damage, most commonly used in reference to mold remediation. Remediation includes identifying the source of the problem, containing the affected area, removing contaminated materials, and treating the area to prevent recurrence.
Restoration
The comprehensive process of returning a damaged property to its pre-loss condition after water, fire, mold, or storm damage. Restoration encompasses mitigation, drying, cleaning, deodorization, and reconstruction as needed to fully recover the structure and its contents.
View all our restoration services→Sanitization
The process of cleaning and disinfecting surfaces and materials to reduce microbial contamination to safe levels. Sanitization is required after exposure to Category 2 or Category 3 water and involves EPA-registered antimicrobial products applied according to manufacturer specifications.
Sewage Backup
The reverse flow of sewage into a building through drain pipes, toilets, or other plumbing fixtures. Sewage backups are classified as Category 3 (black water) and require immediate professional cleanup due to the high concentration of bacteria, viruses, and other pathogens.
Our sewage backup cleanup services→Smoke Damage
Damage to a property and its contents caused by smoke and soot from a fire. Smoke damage includes discoloration, corrosion, and persistent odor that can permeate walls, fabrics, ductwork, and personal belongings. Professional smoke damage restoration involves specialized cleaning, sealing, and deodorization techniques.
Learn about fire and smoke damage restoration→Structural Drying
The systematic process of removing moisture from a building's structural components including framing, subfloor, drywall, and concrete using air movers, dehumidifiers, and specialized equipment. Proper structural drying follows IICRC S500 standards and includes daily monitoring and documentation.
Subrogation
The legal process by which an insurance company seeks reimbursement from a responsible third party after paying a claim. For example, if a neighbor's plumbing failure caused water damage to your home, your insurer may pursue subrogation against the neighbor's insurance after paying your claim.
Thermal Imaging
A non-invasive diagnostic technique using infrared cameras to visualize temperature differences in building materials. Thermal imaging helps restoration professionals identify hidden moisture, detect water intrusion pathways, and verify drying progress without opening walls or ceilings.
Tarp Service
An emergency service that involves installing heavy-duty tarps over damaged roofs or other openings to prevent further water intrusion from rain or weather. Tarp services provide temporary protection until permanent repairs can be made.
See our emergency mitigation services→Water Damage Classification
A system defined by the IICRC S500 standard that categorizes water damage based on the extent of moisture absorption. Class 1 is the least severe (affecting a small area with minimal absorption), while Class 4 involves specialty drying situations such as hardwood floors, plaster, or concrete that require longer drying times and specialized equipment.
Water Extraction
The removal of standing water from a structure using professional extraction equipment such as truck-mounted extractors, submersible pumps, and weighted extraction tools. Rapid water extraction is the single most important step in minimizing water damage and reducing restoration costs.
Learn about our water damage services→Water Mitigation
The immediate response actions taken to stop the source of water, extract standing water, and begin drying to prevent further damage. Water mitigation is the first phase of the restoration process and focuses on stabilization before reconstruction begins.
Contact us for emergency water mitigation→Have Questions About Your Water Damage Situation?
Our IICRC-certified technicians are available 24/7 to assess your property and explain every step of the restoration process. Call us for a free consultation.