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Mould Damage Classification System

/Mould Damage Classification System
Mould Damage Classification System2018-01-09T09:00:14+00:00

Mould Damage Classification System

The following mould damage classification system is to be used as a guideline that Specialised Restoration Services (SRS) follows and help for insured clients or any affected parties to judge the scope of works.

  1. Grade One – Normal
    • This is considered the normal situation in most houses and buildings without mould damage. Mould may still be present indoors in these situations however the genre and species of indoor mould should be present and the levels should be below the outside level. Level one PPE. No containment required. No immediate remediation required.
  2. Grade Two – Visible mould growth to less than 1m2
    • This grade of mould damage refers to the initial inspection and sample taking process and very small areas of mould growth that can be effectively cleaned using relatively simple cleaning methods. Level two PPE. Possible containment of a small area around the affected area of mould growth.
  3. Grade Three – Visible mould growth from 1m2 to 10m2
    • This grade of mould damage concerns an indoor environment that has sustained serious mould damage over a period of time. The visible mould growth would be clearly visible on less than 25% of all surfaces or nor greater than 10 square metres. Level three PPE. Containment of the affected area is required to prevent cross contamination and spread of mould spores throughout non-affected areas.
  4. Grade Four – Visible mould growth greater than 10m2
    • This grade of mould damage concerns and indoor environment that has sustained severe mould damage that has affected the structural integrity of building materials sch as wall and ceiling linings. Visible mould growth is greater than 25% on all surfaces or more then 10 square metres.  Structural areas are most likely to have a high moisture content and will require drying. Level four PPE. Containment is required to prevent cross contamination and spread of mould spores to a non-affected area.
  5. Grade Five – Strong Indication of mould but no visible evidence
    • This grade of mould damage might be characterised by any of the following;
      • Complaints of ill health symptoms (no visible mould);
      • Complaints of obnoxious mouldy odours (no visible mould);
      • Signs of structural weakness (dry rot or destruction to timber); and
      • Evidence of previous moisture damage and complaints about odours (no visible mould);
      • Laboratory samples have measure high concentrations of parameters such as MVOCs or VOCs without any obvious source.
        • Range of PPE usage from Level two to Level Four.
        • Containment may not be required during the inspection but may be required to prevent cross contamination.
  6. Grade Six – Cross Contamination
    • This grade of mould damage concerns an indoor environment that was grade one, but has been contaminated by spores and dust that originated from a grade two, three or four situations. Level two or three PPE. Containment is recommended to prevent further cross contamination.
  7. Grade Seven – Clean Room
    • This grade of mould damage is for absolute sterilised clean room environments such as those used in pharmaceuticals and computer components manufacture.  Only highly qualified and experienced engineers and IAQ experts should be consulted in these situations. Protocols for handling grade 4 remediation works should be followed.