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Class of Water Ingress

/Class of Water Ingress
Class of Water Ingress 2018-01-10T03:02:44+00:00

The term “class of water ingress or intrusion” is a classification of the estimated evaporation load and is used when calculating the initial humidity control (e.g. dehumidification, ventilation). The classification is based on the approximate amount of wet surface area, and the permeance and porosity of affected materials remaining within the drying environment at the time drying is initiated. Information needed to determine class should be gathered during the inspection process. The classes are divided into four separate descriptions, class 1, 2, 3 and 4.

  • Class One;
    • Least amount of water absorption and evaporation load;
    • Water intrusion where wet, porous materials (e.g. carpet, gypsum board, fibre-fill insulation, concrete masonry unit (CMU), textiles) represent less than 5% of the combined floor, wall and ceiling surface area in the space; and where materials described as low evaporation materials (e.g. plaster, wood, concrete, masonry) or low evaporation assemblies (e.g. multilayer wallboard, multilayer subfloors, gym floors, or other complex built-up assemblies have absorbed minimal moisture.
  • Class Two;
    • Significant amount of water absorption and evaporation load;
    • Water intrusion where wet, porous materials (e.g. carpet, gypsum board, fibre-fill insulation, concrete masonry unit (CMU), textiles) represent 5% to 40% of the combined floor, wall and ceiling surface area in the space; and where materials described as low evaporation materials (e.g. plaster, wood, concrete, masonry) or low evaporation assemblies (e.g. multilayer wallboard, multilayer subfloors, gym floors, or other complex built-up assemblies have absorbed minimal moisture.
  • Class Three;
    • Greatest amount of water absorption and evaporation load;
    • Water intrusion where wet, porous materials (e.g. carpet, gypsum board, fibre-fill insulation, concrete masonry unit (CMU), textiles) represent more than 40% of the combined floor, wall and ceiling surface area in the space; and where materials described as low evaporation materials (e.g. plaster, wood, concrete, masonry) or low evaporation assemblies (e.g. multilayer wallboard, multilayer subfloors, gym floors, or other complex built-up assemblies have absorbed minimal moisture.
  • Class Four;
    • Deeply held or bound water;
    • Water intrusion that involves a significant amount of water absorption into low evaporation materials (e.g.plaster, wood, concrete, masonry) or low evaporation assemblies (e.g. multilayer wallboard, multilayer subfloors, gym floors, or other complex built-up assemblies). Drying may require special methods, longer drying times, or substantial water vapour pressure differentials.