Water Mitigation

Water does not sit still. It moves along framing, wicks vertically up drywall and insulation, runs under baseboard, and travels through wall cavities into rooms that look completely dry. Within the first day or two the loss is still mostly a drying problem. Past that window, under the right temperature and humidity conditions, it starts becoming a microbial problem — and microbial growth changes the scope, the cost, and the health considerations of the whole project.

This is why the response matters more than any single piece of equipment. Get the source stopped, get standing water out, get airflow and dehumidification running, and most of what would have been demolition stays in place.

The industry classifies water losses by contamination, and the category drives what can be saved. Category 1 is clean water from a sanitary source — a supply line, a water heater, rainwater. Category 2, often called gray water, carries significant contamination: dishwasher and washing machine discharge, toilet overflow with urine only, aquarium water. Category 3, black water, is grossly contaminated — sewage, rising floodwater from outside, seawater, and any water that has been sitting long enough to degrade.

Two things about categories catch people out. First, clean water does not stay clean; a Category 1 loss left standing can degrade to Category 2 or 3 as it picks up contaminants and biological activity. Second, category determines whether porous materials such as carpet pad, insulation, and saturated drywall can be dried in place or must be removed. On a Category 3 loss, porous materials come out.

Where category describes how dirty the water is, class describes how much evaporation load the drying system faces — a function of how much material got wet and how absorbent it is. A small spill on a tile floor and a fully saturated carpeted floor with wet drywall three feet up the wall are entirely different drying problems even though both are clean water. Class is what determines how many air movers and how much dehumidification capacity the space actually needs.

Removing a gallon of water with a truck-mounted or portable extractor takes seconds and no energy from the drying system. Evaporating that same gallon takes hours of air mover and dehumidifier runtime, and every bit of it has to be pulled back out of the air afterward. Aggressive extraction — including weighted extraction over carpet and pad — is the highest-value step in the entire process, and skipping it lengthens the job for no benefit.

Structural drying is the controlled manipulation of four variables: temperature, humidity, airflow, and time. Air movers do not dry materials directly. They break up the thin saturated boundary layer of air sitting against wet surfaces and accelerate evaporation into the room. Dehumidifiers then remove that moisture from the air so it does not simply redeposit somewhere colder.

Refrigerant dehumidifiers condense moisture on a cold coil and drain it away; low-grain refrigerant units perform well in the drier conditions late in a job. Desiccant dehumidifiers adsorb moisture chemically and can pull humidity down further, which is what you want on dense materials such as hardwood, plaster, and structural framing. Specialty drying systems can push air directly into wall cavities, under hardwood, and beneath cabinet toe kicks — reaching water that would otherwise force demolition.

Thermal imaging cameras do not detect moisture. They detect temperature difference, and evaporating water cools a surface, which makes wet areas show as cool anomalies behind finishes. That is how the search gets narrowed quickly across a large area.

Confirmation comes from meters. Non-penetrating meters read moisture near the surface without damaging the finish. Penetrating pin meters read moisture inside a material at depth. Thermo-hygrometers track temperature and relative humidity of the affected space, unaffected areas, the outside air, and the dehumidifier discharge — which is how you tell whether the drying system is actually working or just moving air around.

The single most common failure in water work is calling a job dry because surfaces feel dry. Framing and subfloor can hold enough moisture behind an apparently dry wall to support growth for months. The correct target is a documented moisture content compared against an unaffected reference area of the same material in the same building, verified with meters and recorded daily until the readings hold.

Those daily logs also do double duty. They are the evidence an adjuster uses to justify the scope, and they are your record that the structure was returned to a dry standard rather than closed up wet. Antimicrobial treatment is applied where appropriate, but treatment is not a substitute for drying — moisture control is what prevents mold.

CMAC responds 24/7 across Texas, Oklahoma, Arkansas, Tennessee, and Georgia, and handles insurance claim documentation and adjuster meetings. Call 1-888-389-CMAC.