Mould – What To Expect From Your Environmental Consultant

This is part 3 Of 5 part series.  (Yes, there is that much to say about mould!)


When you contract an environmental consultant to perform a mould inspection this is a generalized break down of what you can expect.

First off it’s always a visual assessment. The assessment for mould should be conducted in accordance with standard industry practice as set out in the Canadian Construction Association (CCA) “Mould Guidelines for the Canadian Construction Industry” for a visual assessment and the Cleantrust S500/S520 (formally known as the IICRC).

Although there are no regulatory requirements in Ontario for such an assessment, the CCA guidelines, and similar guidelines from other agencies have been accepted as the industry standard by most experts, consultants, the Ontario Ministry of Labour, and the Canadian Construction Association.

All guidelines and protocols for mould investigations indicate that investigations should be performed largely on a visual basis with limited collection of bulk and/or air samples.

The Ontario Ministry of Labour has consistently enforced the removal of all mould from buildings regardless of mould genus or species, and therefore bulk samples or air samples for confirmation of mould are not typically collected for investigative purposes where mould is visible.

Next step should be to test and record the temperature and relative humidity measurements. The common tool utilized for this is the “Extech 445580 digital hygro-thermometer”. The Extech 445580 is a hand held unit that measures relative humidity (RH) and temperature of an area. The meter measures temperatures from -10 – 50oC and relative humidity range of 10 – 90% with an accuracy of ± 5%.

As indicated by the IICRC S500 document, persistent relative humidity above 60% is conducive to mould growth.

The final option would be to collect air samples and/or tape lift samples. Neither of these is mandatory and generally speaking are not necessary to identify and confirm mould(s) are present in your home or business.

However, if you want some documentation you can request that your consultant perform these services.

In our next blog we will be outlining the levels of mould and the associated remediation practices.

If you have questions or would like to discuss your specific situation please contact us at Kenneth Homes Design Build Inc.


Upcoming Series On Everything To Know About Mould:

Part 4:  What Are The Categories Of Mould?

Part 5:  What Are The Categories Of Water Damage?

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