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The purpose of mold testing is to determine the presence of mold through (IAQ) air quality testing, surface testing or physical testing of select items.
Surface testing is used to verify whether or not the area tested is hosting mold, if it is live and what types of mold are present.
All samples will be sent to a certified mold lab to determine the presence of mold, types and quantities of mold for each sample. Once analyzed, the mold lab will release a report to the inspector, which will be interpreted and then sent to the client.
IAQ testing is needed to figure out how many spores are present in the air. This essentially determines whether the air is safe or not.
In order for the air in the home to be accurately assessed, it is necessary to have one sample taken outside the home and at least one or more samples inside.
The one outside air sample is called the “control” or “base sample”, for which the other inside sample(s) are compared against.
We compare the samples to understand if the mold spore counts outside the home are higher or lower than inside. We also want to see what types of mold are growing inside compared to the outside.
At this point we have a better understanding of how to proceed with the mold removal efforts.
The same air quality test should be performed post mold removal, to ensure that the removal company did an adequate in bringing the home back to normal IAQ conditions.
After all of the mold and moisture has been removed, and your home is restored, it is time for a mold clearance test. Clearance tests are important because they will either verify whether the mold removal effort has been successful or not.
*It is critical to have this test done by an independent 3rd party mold inspector, rather than the company that performed the removal. You need to be sure that your mold clearance test is unbiased.
*According to the IICRC (Institute of Inspection, Cleaning and Restoration Certification) all mold samples should be sent to an accredited microbial lab, that is set in a controlled environment. So make sure that your mold inspector doesn’t analyze the samples he/she has collected.
Although many mold removal companies have their own in-house mold inspectors, it is best to hire an independent or 3rd party mold inspector. By doing so, you avoid a conflict of interest.
As a point of reference, mold inspectors; especially those who do not work with mold full-time are typically not trained to understand and explain the lab test results.
It is important for the person collecting the mold samples be qualified to interpret the lab results once they are received.
With a swab test, the inspector takes a lab prepared swab and collects a physical sample along the surface of areas they identify as suspected mold.
With a tape test, the inspector presses a piece of clear tape on a surface to capture the suspected mold and sends it off to the lab for analysis.
A bulk sample is actually the best type of physical sample, as it contains an undisturbed area of possible mold that has been physically removed from the home and sent to the lab. A piece of drywall is a common bulk sample.
Almost any professional in the mold removal and or inspection business (with the exception of those who sell them) will tell you to avoid home test kits for mold. Although they will reveal mold in the home, you may not be able to determine the cause of mold.
These tests should be viewed as a way to satisfy your curiosity about what types of mold exist in your home at the time of testing, as all homes and building will have mold to some degree.
All homes will have mold spores in them. What the lab test won’t do is tell you how to deal with it, or even if it needs to be addressed.
Your biggest question after the home mold test will be – now what? You are back at square one, and likely more confused because you don’t know what to do with the data that you just paid for.