Mold testing involves two main methods: air sampling and surface sampling. Both types require analysis by a certified laboratory. Woodard Inspections is trained to know when to offer what test is and this service is not part of a standard home inspection.

Along with the sampling equipment, the tools commonly used by home inspectors for a mold inspection of the home's interior include some of the following:

• Moisture Meter: This basic tool is used to detect moisture in structural components. There are invasive and non-invasive models available.
• Humidity Gauge: This measures the humidity level inside a room or building.
• Thermal Imaging or Infrared (IR) Camera: Where visual inspection is not possible, especially for suspected water intrusion that's inside structural components, damp and wet areas can be detected non-invasively with thermal imaging. Problem areas will show up as dark gradients.

Air sampling is conducted indoors and outdoors using spore traps or canisters. This less-common method is used for homes in areas suspected of having high concentrations of mold spores. The outdoor samples are used to create a control or baseline to determine the level of contamination, and then the control is compared to the indoor samples. When taking the outdoor sample, the home inspector should be alert to environmental conditions that can affect the results, such as wind, rain, snow, and fluctuating temperatures.

Surface sampling is the more common and easiest method for testing for indoor mold.

Here are some methods of surface sampling that can be performed:

• Tape Sample: This is the most common method of sampling visible mold, as it allows the inspector to collect several samples in different parts of the home quickly. Sampling kits are typically sold by the laboratories that test for mold and send back the results of their analysis.
• Swab Sample: A cellulose swab with a liquid preservative is used to collect any suspected mold for laboratory testing.
• Carpet Sample: In rooms where there is carpeting, testing can be performed on vacuumed contents, or even a snip of the carpeting. Typically, carpets that have visible mold or have tested positive for mold should be discarded and replaced, as it's nearly impossible to remove all traces of mold from carpet fibers, where mold will likely continue to grow.