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Pre-Inspection Checklist

Help us perform the best home inspection possible by making sure these checklist items are complete prior to the inspection date.

Mold Inspection and Testing Columbus Ohio

Columbus Advanced Inspections offers mold testing and inspection utilizing a variety of methods to ensure your home is safe:
  • Moisture Meter and Thermal Imaging Camera - We utilize a moisture meter and thermal camera in order to identify sources of water that can allow dangerous mold to thrive.
  • Air Sampling - We perform air sampling as needed to test for mold spores inside the home and compare the levels to naturally occurring spore levels outside.  This test is useful in determining if visible mold is circulating in the air or to identify the presence of mold that is suspected but cannot be confirmed visually.
  • Tape & Swab Sampling - We perform surface testing of suspected areas to confirm the presence of mold.

Air-Sampling

Taking air samples during a mold inspection is important for several reasons.  Mold spores are not visible to the naked eye, and the types of mold present can often be determined through laboratory analysis of the air samples.  Having samples analyzed can also help provide evidence of the scope and severity of a mold problem, as well as aid in assessing human exposure to mold spores.  After remediation, new samples are typically taken to help ensure that all mold has been successfully removed.
 
Air samples can be used to gather data about mold spores present in the interior of a house.  These samples are taken by using a pump that forces air through a collection device which catches mold spores.  The sample is then sent off to a laboratory to be analyzed.

Air-Sampling Devices

There are several types of devices used to collect air samples that can be analyzed for mold.  Some common examples include:
  • impaction samplers that use a calibrated air pump to impact spores onto a prepared microscope slide;
  • cassette samplers, which may be of the disposable or one-time-use type, and also employ forced air to impact spores onto a collection media; and
  • airborne-particle collectors that trap spores directly on a culture dish.  These may be utilized to identify the species of mold that has been found.

When and When Not to Sample

Samples are generally best taken if visual, non-invasive examination reveals apparent mold growth or conditions that could lead to growth, such as moisture intrusion or water damage.  Musty odors can also be a sign of mold growth.  If no sign of mold or potential for mold is apparent, one or two indoor air samples can still be taken, at the discretion of the inspector and client, in the most lived-in room of the house and at the HVAC unit.  

Outdoor air samples are also typically taken as a control for comparison to indoor samples. It is best to take the outdoor samples as close together in time as possible to the indoor samples that they will be compared with.

Where to Sample and Ideal Conditions

In any areas of a house suspected or confirmed to have mold growth, air samples can be taken to help verify and gather more information.  Moisture intrusion, water damage, musty odors, apparent mold growth, or conditions conducive to mold growth are all common reasons to gather an air sample.  Samples should be taken near the center of the room, with the collection device positioned 3 to 6 feet off the ground.

Sampling should take place in livable spaces within the house under closed conditions in order to help stabilize the air and allow for reproducibility of the sampling and measurement.  While the sample is being collected, windows and exterior doors should be kept shut other than for normal entry and exit from the home.

Weather conditions can be an important factor in gathering accurate data. Severe thunderstorms or unusually high winds can affect the sampling and analysis results.  High winds or rapid changes in barometric pressure increase the difference in air pressure between the interior and exterior, which can increase the variability of airborne mold-spore concentration.  Large differences in air pressure between the interior and exterior can cause more airborne spores to be sucked inside, skewing the results of the sample. 

Difficulties and Practicality of Air Sampling

It is helpful to think of air sampling as just one tool in the tool belt when inspecting a house for mold problems.  An air sample alone is not enough to confirm or refute the existence of a problem, and such testing needs to be accompanied by visual inspection and other methods of data collection, such as a surface sample.  Indoor airborne spore levels can vary according to several factors, and this can lead to skewed results if care is not taken to set up the sampling correctly.  Also, since only spores are collected with an air sample and may actually be damaged during collection, identification of the mold type can be more difficult than with a sample collected with tape or a cultured sample.

Air samples are good for use as a background screen to ensure that there isn’t a large source of mold not yet found somewhere in a home.  This is because they can detect long chains of spores that are still intact.  These chains normally break apart quickly as they travel through the air, so a sample that reveals intact chains can indicate that there is mold nearby, possibly undiscovered during other tests and visual examination. 

In summary, when taken under controlled conditions and properly analyzed, air samples for mold are helpful in comparing relative particle levels between a problem and a control area.  They can also be crucial for comparing particle levels and air quality in an area before and after mold remediation.

Also read more about abrasive blasting for mold remediation, moisture inspection for mold problems, and general mold inspection.

Columbus Advanced Inspections is certified in mold inspection and performs air sampling, tape lift mold sampling, and swab lift mold sampling. Contact our Columbus mold inspectors with any questions or to schedule an appointment.