Key Engineering Controls and Work Practices

  • Develop a suitable mold remediation plan.  For remediation of extensive contamination (greater than 100 contiguous square feet in one area), the plan should address: work area isolation, the use of exhaust fans with HEPA filtration, and the design of airlocks/decontamination room
  • Consult with industrial hygienists or other environmental health and safety professionals with experience performing microbial investigations and/or mold remediation before beginning remediation
  • The work area should be unoccupied.  If the containment practices listed below will keep mold spores from leaving the contained area, then it may not be necessary to remove people from surrounding areas.  However, removal is still recommended for infants, persons recovering from surgery, immune suppressed people, or people with chronic inflammatory lung diseases (e.g., asthma, hypersensitivity pneumonitis, and severe allergies)
  • Before beginning work, cover and seal other surfaces in the work area that could become contaminated with mold spores using plastic sheeting and duct tape; this will help contain dust and debris and prevent further contamination
  • Contain the affected area.  Completely isolate the area to be evaluated and remediated from occupied spaces using plastic sheeting, or other particulate barrier, sealed with duct tape.  Use air locks at entry/exit points and provide a sealed decontamination room that is connected to the containment where mold remediation workers must remove PPE before exiting
  • Shut off the HVAC system and seal ventilation ducts/grills in the work area and adjacent areas to prevent the spread of spores
  • Keep the work area under negative pressure to minimize the spread of spores to adjacent areas.  Use an exhaust fan equipped with HEPA filtration to maintain negative pressure
  • Use dust suppression methods (e.g., misting (not soaking) surfaces prior to remediation)
  • Clean and/or remove materials as noted in the damage materials.  Seal materials being removed in plastic bags; wipe down or HEPA vacuum the outside surface of the bags of material being removed
  • Before removing isolation barriers, HEPA vacuum the contained area and the decontamination room and then clean or mop it with a detergent
  • Leave area clean, dry, and free of visible debris

Source: Mold Remediation – Extensive Contamination