Water Damage Restoration (WRT): Classification, Drying Logic, and Documentation
Water Damage Restoration (WRT) Domain
This domain tests how you classify a water loss and turn that classification into a defensible drying plan. The exam expects S500 vocabulary: categories describe contamination, while classes describe the amount and location of absorbed water. Getting both labels right drives PPE, material removal, equipment counts and documentation.
Categories and Classes
- Category 1 water is sanitary at the point of discharge but can degrade to Category 2 or 3 with time, heat or contact with contaminants.
- Category 2 water is significantly contaminated and may cause illness: washing-machine discharge, dishwasher overflow, toilet bowl overflow without feces.
- Category 3 water is grossly contaminated-sewage, toilet trap water, ground-surface flooding-and usually requires removal of porous materials.
- Class 1 has little absorption and a low evaporation load. Class 2 has significant absorption with water trapped in carpet and cushion. Class 3 usually comes from above and saturates ceilings, insulation and wall cavities. Class 4 involves deep pockets in low-permeance materials such as hardwood, concrete and plaster, needing specialty drying.
Drying System
Extraction removes bulk water; air movers raise evaporation; dehumidifiers remove vapor; temperature control keeps both efficient. Record a dry standard from unaffected material and log readings daily.
Worked Example
A clean supply line bursts in a second-floor bathroom and water runs through the ceiling into the living room. The source is sanitary, so the loss starts as Category 1. Water entered from overhead and is trapped in ceiling, insulation, wall cavities, carpet and cushion, which fits Class 3. Plan: stop the source, extract, remove saturated insulation, float carpet, position air movers and dehumidifiers, monitor the ceiling cavity, and compare readings with the dry standard. If the water sits or contacts soil, reclassify it.
Traps
Expect items that swap category for class, assume Category 1 stays clean indefinitely, specify airflow without dehumidification, or dry Category 3 without containment and PPE.