Restoration Industry Glossary

Antimicrobial

An EPA-registered chemical applied during water damage restoration to prevent microbial growth — primarily mold and bacteria — while structural drying is in progress.

Black Water (Category 3)

Under IICRC S500, the most contaminated category of water damage. Includes sewage, outdoor flood water, and water containing fecal coliform. Requires full PPE and disposal of affected porous materials.

Related: Category of Water, IICRC S500

Category of Water

IICRC S500 classification of water cleanliness. Category 1 (clean) from a sanitary source, Category 2 (gray) with some contamination like dishwasher discharge, Category 3 (black) from sewage or floodwater. Drives the restoration protocol.

Related: IICRC S500, Black Water (Category 3)

Class of Water Damage

IICRC S500 classification of the volume of water affecting materials. Class 1 is minimal, Class 2 is widespread carpet/walls, Class 3 is affected from above, Class 4 requires specialty drying (hardwood, concrete, plaster).

Containment

Physical barriers — typically 6-mil polyethylene sheeting combined with negative air pressure — used to isolate a contaminated work area from unaffected parts of a structure during mold remediation or Category 3 water damage response.

Related: HEPA, Negative Air Pressure

Desiccant Dehumidifier

A dehumidifier that uses a moisture-absorbing material (silica gel or lithium chloride) instead of refrigeration. Used for drying concrete slabs and dense materials where refrigerant units can't reach low enough dew points.

Related: LGR Dehumidifier

Dry Standard

The target moisture content that must be reached during structural drying, defined as equilibrium with unaffected materials elsewhere in the structure. Documented with daily moisture logs.

Drying Chamber

A zone created with containment barriers and controlled airflow to accelerate and focus drying on a specific area, typically used in structural drying of enclosed cavities.

HEPA (High-Efficiency Particulate Air)

A filtration standard that captures 99.97% of airborne particles ≥0.3 microns. Required for mold remediation air scrubbing, PPE respirators, and vacuum filtration during restoration work.

Related: Containment

Hydrophobic

A material that repels water. Some synthetic carpet fibers are hydrophobic, which can affect drying strategy — surface water is easy to extract, but backing and pad hold water stubbornly.

Hyphae

The root-like filaments mold produces to anchor to a growth substrate. In porous materials like drywall, hyphae penetrate deep into the material, which is why surface cleaning doesn't kill mold — full material removal is usually required.

IICRC

Institute of Inspection, Cleaning and Restoration Certification. The global certifying body for cleaning, restoration, and inspection professionals. Publishes the S500 (water), S520 (mold), S540 (trauma), and other industry standards.

IICRC S500

The IICRC professional standard for water damage restoration. Defines category and class of water, drying protocols, moisture documentation, and structural drying requirements.

IICRC S520

The IICRC professional standard for mold remediation. Defines Conditions 1–3 and required protocols: containment, source removal, HEPA cleaning, post-remediation verification.

Injectidry

A brand of directed airflow system used to push warm dry air into structural cavities — wall cavities, under cabinets, subfloors — that air movers can't reach from the surface.

LGR Dehumidifier (Low-Grain Refrigerant)

A refrigerant-based dehumidifier capable of reaching lower grains per pound of moisture than conventional dehumidifiers. Standard equipment for professional water damage drying.

Related: Desiccant Dehumidifier

Mitigation

The immediate actions taken to stop ongoing damage and prevent secondary damage — water extraction, structural drying, antimicrobial application, emergency tarp. Distinct from restoration, which comes later.

Related: Restoration

Moisture Content (MC)

The percentage of water in a material, measured with a moisture meter. Baseline/dry MC varies by material: drywall ≈0.5%, softwood ≈12%, hardwood ≈8%. Drying targets bring affected materials back to baseline MC.

Mold Remediation

The process of identifying, containing, and removing mold contamination per IICRC S520, including moisture source elimination and post-remediation verification.

Mycotoxin

A toxic secondary metabolite produced by certain molds — most notably Stachybotrys chartarum. Mycotoxin exposure causes respiratory, neurological, and immune system effects with prolonged contact.

Related: Stachybotrys chartarum

Negative Air Pressure

An airflow state created with HEPA air scrubbers venting outside a containment zone, pulling air inward through controlled openings. Prevents spore or particulate escape from the work area.

PPE (Personal Protective Equipment)

Respiratory and body protection worn during hazardous restoration work. Category 3 water and mold remediation typically require P100 respirators, Tyvek suits, nitrile gloves, and eye protection.

Pre-Loss Condition

The condition of a property before the damage occurred. The target state for restoration. Insurance coverage is generally defined as returning the property to pre-loss condition, accounting for depreciation.

Psychrometrics

The science of air-water vapor relationships — temperature, relative humidity, dew point, grains per pound. The physics underlying professional structural drying calculations.

Replacement Cost Value (RCV)

The cost to replace damaged property with new materials of similar kind and quality. Contrast with Actual Cash Value (ACV), which is RCV minus depreciation. Many policies pay ACV first and recoverable depreciation after work is completed.

Restoration

The rebuild phase following mitigation — replacing damaged drywall, flooring, cabinetry, paint, and fixtures to return a property to pre-loss condition.

Related: Mitigation

Scope of Work

The detailed list of materials, labor, and equipment required to restore a property after damage. Typically documented in Xactimate format for insurance alignment.

Related: Xactimate

Slab Leak

A water leak in pipes embedded in or running under a concrete slab foundation. Common in Central Texas due to expansive clay soils that shift and stress plumbing. Symptoms include warm spots on floors, water bill spikes, and wicking on walls.

Stachybotrys chartarum

The mold species commonly called 'black mold.' Produces mycotoxins that cause serious health effects with prolonged exposure. Grows on cellulose-based materials (drywall, wood) under sustained moisture conditions.

Related: Mycotoxin, Mold Remediation

Structural Drying

The process of removing moisture from building materials after water damage, using a calculated combination of air movers, dehumidifiers, and heat per IICRC S500 psychrometric requirements.

Supplement

An addition to an original insurance claim scope, typically for hidden damage discovered during restoration or for items missed in the initial adjuster estimate. Normal and expected on most water damage claims.

Thermal Imaging

Infrared photography used during water damage assessment to detect temperature differences caused by moisture. Wet materials appear cooler because evaporation cools the surface. Used to find hidden water behind walls and under floors.

Water Extraction

The mechanical removal of water from affected materials using truck-mounted or portable extraction equipment. Must precede drying — you can't dry what's still flooded.

Wicking

The capillary action by which water moves through porous materials against gravity. Particularly relevant in slab leaks, where water wicks up drywall from a wet concrete slab.

Xactimate

The industry-standard estimating software used by insurance adjusters and restoration contractors. Produces line-item estimates with regional pricing for every material and labor task. Scope alignment in Xactimate format accelerates claim resolution.