Quick answer: A commercial water damage job is dried in stages: make it safe (electrical, structural, contamination), stop the water and extract standing water, remove materials that can't be saved, then dry with air movers on wet surfaces and dehumidifiers that remove the evaporated water from the air. Write an equipment schedule by zone that covers dehumidifier capacity at the expected room condition, air movement, power and drainage. Track material moisture readings at marked points until they meet the reinstatement criteria. Running time alone doesn't tell you when to rebuild.
Quick answer
- Safety → stop water → extract → remove → dry → verify.
- Air movers evaporate; dehumidifiers remove the vapour; extraction removes liquid fastest.
- Dry by measured material moisture, not by days.
1. Safety triage
- Keep people out of areas with unsafe electrics, structural damage, sewage or chemical contamination, or extensive mould.
- Don't energise flood-affected electrical systems; don't run fuel-powered generators indoors.
- Treat sewage and floodwater as contaminated; clean water can become contaminated with time and contact.
EPA's flood cleanup guidance covers safe entry and cleanup (EPA, Flood cleanup) and its commercial-building mould guide covers moisture meters and drying (EPA, Mold remediation in schools and commercial buildings).
2. Map affected zones and materials
- Source, time of loss, affected area map.
- Wet materials: floors, walls, insulation, cavities, HVAC components.
- Thermal imaging to find patterns; confirm with moisture meters.
- Mark measurement points; record material, instrument, date.
3. Assign responsibilities
| Duty | Responsible |
|---|---|
| Source repair | Plumber, roofer, facilities |
| Electrical safety | Qualified electrician |
| Contamination assessment | Qualified assessor |
| Extraction and removal | Restoration contractor |
| Drying and monitoring | Restoration contractor |
| Acceptance and rebuild | Owner, insurer, builder |
4. Equipment by stage
| Stage | Equipment | Why |
|---|---|---|
| Extraction | Pumps, wet vacs, weighted extractors | Liquid water is removed far faster than by evaporation |
| Evaporation | Air movers across wet surfaces; cavity drying systems | Moves moisture from materials into the air |
| Vapour removal | Refrigerant (LGR) dehumidifiers; desiccant for cold spaces or very low targets | Keeps air dry so evaporation continues |
| Heat (if needed) | Indirect heaters | Speeds evaporation; keep safe |
| Air filtration | HEPA air scrubbers where contamination or mould | Protects occupants |
See desiccant dehumidifiers for water damage and drywall drying time.
Choose desiccant dehumidifiers for cold restoration spaces or very low moisture targets, alongside air movers after standing water has been extracted.
5. Equipment schedule (template)
| Zone | Wet materials | Room condition (T/RH) | Dehumidifiers (capacity at that condition) | Air movers | Power (circuits) | Drain route |
|---|---|---|---|---|---|---|
Check dehumidifier capacity at the expected room condition (often cooler and less humid than the rating condition) and that circuits can take the load.
6. Drying records and completion
- Daily: room T/RH, outdoor T/RH, material readings at marked points, equipment changes.
- Completion: readings meet the material maker's or agreed reinstatement criteria at all points.
- Keep the log for the owner and insurer; see the drying log guide.
7. Budget equipment time from the job
Drying time depends on materials, how much water they absorbed, room conditions and equipment. Estimate from the first days' readings, not from a fixed number of days.
Our industrial dehumidifiers and desiccant rotor dehumidifiers are used for large-area drying.
FAQ
Frequently asked questions
What equipment is used for water damage restoration?
Extraction pumps and vacuums, air movers, dehumidifiers (refrigerant or desiccant), heaters and air scrubbers.
How long does commercial water damage drying take?
It depends on materials and conditions; dry until readings meet the criteria, typically several days for wet structural materials.
Refrigerant or desiccant for restoration?
Refrigerant (LGR) for warm buildings; desiccant for cold buildings or very dry targets.
Sources
- US EPA, Flood cleanup to protect indoor air and your health.
- US EPA, Mold remediation in schools and commercial buildings.
- IICRC S500, Standard for professional water damage restoration (industry standard).
