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Definitions of each Class of Water Damage
Class 1 : Slow Rate of Evaporation – Least amount of water absorption and evaporation load
Water intrusion where low porosity materials (e.g hard surface flooring, plaster, concrete) or medium porosity materials (e.g structural framing, wood substrates) have absorbed minimal moisture.
Less than 5% of the combined floor, wall and ceiling surface area in the space is wet, highly porous material (e.g carpet, plasterboard)
Class 2: Fast Rate of Evaporation – Significant amount of water absorption and evaporation load
Water intrusion where wet, highly porous materials (e.g carpet, plasterboard) represent more than 5%, but less than 50% of the combined floor, wall and ceiling surface area in the space.
Class 3: Fastest Rate of Evaporation – Greatest amount of water absorption and evaporation load
Water intrusion where wet, highly porous materials (e.g carpet, plasterboard) represent more than 50% of the combined floor, wall and ceiling surface area in the space
Class 4 : Specialty Drying Situations – Deeply held or bound water
A water intrusion that involves a significant amount of water and absorption into low porosity materials (e.g hard surface flooring, plaster, concrete) or assemblies (gymnasium floors, structural cavities, multiple layers of plasterboard) that have a low rate of evaporation due to deeply held or bound water. Drying may require special methods, longer drying times, or substantial vapor pressure differentials.
Other Considerations:
Other factors can impact the drying environment. Restorers should understand and consider these factors when estimating the drying capacity needed to prevent additional damages and begin the drying process. These factors include:
Influence of heating, ventilating, and air conditioning (HVAC) systems
Build-out density of the affected area
Building construction and complexity
Influence of outdoor weather conditions