Indoor area after a mold remediation that looked good but was not successful Guide to Mold Clearance Inspections
Tests performed after a mold cleanup job

  • MOLD CLEARANCE INSPECTIONS - CONTENTS: When & How to Inspect and Test after Mold Cleanup. What building areas should be tested?. How does a building "pass" a clearance inspection?

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Mold clearance inspections & testing: Here we explain and describe the post remediation mold clearance procedures and testing that should be used after a mold remediation or mold cleanup project.

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A Guide to Post Remediation Mold Clearance Inspection & Testing

Mold remediation job site photo (C) Daniel FriedmanThis article is part of our series: the Mold ACTION GUIDE which provides an easy to understand step-by-step guide for dealing with toxic or allergenic indoor mold and other indoor contaminants: what to do about mold "mildew," moisture, in your house or office, building-related illness, involving your physician, treatment, sick building investigators, reduction of irritants, and special products to help clean buildings and air.

Our advice on inspecting and testing to evaluate the adequacy of a mold cleanup job is divided into the articles listed at the top of this page.

We include photos of successful and somewhat questionable mold cleanup practices throughout these articles. Our mold cleanup jobsite photo at left shows a thorough inside demolition, surface cleaning, and spot-application of fungicidal sealant in a 1940's panelized home that had suffered from a severe mold contamination problem while left unattended.

Also see MOLD INSPECTORS & MOLD TESTERS for our online directory of mold inspection and testing experts.

See MOLD CLEANUP COMPANIES for our online directory of mold cleanup companies - mold remediators.

To avoid a conflict of interest we recommend that mold inspection, testing, or post-cleanup inspection and testing should be performed by an expert who has absolutely no financial or business relationship with the mold cleanup or mold remediation company. Before hiring us or any onsite test or investigation expert for a field investigation, inspection, or testing, be sure to review

For each step in the process of diagnosing, identifying, removing, and preventing indoor mold problems in buildings, links to in-depth articles are provided. In some cases in this document We use excerpts from longer dissertations on these subjects. Where we do that we offer a link to the longer, more detailed original documents as well. Extensive, in-depth articles about mold and other indoor air quality concerns are organized at our
Mold Information Center

This article series discusses the importance of mold clearance inspection and testing following a mold cleanup or "mold remediation" project and gives advice on who should conduct mold clearance sampling, when clearance testing should be performed, and how to interpret the results of a post remediation mold clearance inspection and test. What should be involved in a mold remediation clearance inspection and test?

What is the Purpose of a Post Remediation Mold Clearance Inspection?

The purpose of a mold clearance inspection is to assure that the mold cleanup has been done correctly and effectively in the work area and to confirm that the cleanup did not accidentally distribute high levels of moldy dust and debris into other building areas or into its mechanical systems such as heating or air conditioning systems.

Watch out: To avoid conflicts of interest, mold clearance testing should never be performed by the mold remediation contractor nor by someone with any business or financial connection with such contractors.

Also, just "testing" a building for mold is not nearly as reliable as an expert visual inspection.

And if you are testing for mold after a mold remediation job, don't forget to test for cross-contamination of moldy dust by screening building areas that were not part of the mold cleanup job.

Can We Rely on Air Tests for Mold after a Mold Cleanup Job?

Simple air tests for mold after a mold remediation job may be quite unreliable as the airborne level of particles varies enormously from moment to moment, especially depending on variables in building conditions such as we list below. An air test captures a small volume of air at a moment in time and should not be used as the sole criteria for passing or failing a mold clearance inspection and test. Here are some of the sources in variability in the level of indoor particles in air:

And the commonly-stated and simple use of a mold remediation clearance test acceptable mold spore ratio (percentage of indoor versus outdoor spore counts) can be very unreliable too. A visual inspection for extent of work, cleanliness, and careful selection of screening samples of mold from surfaces, dust, and possibly air, inside and outside the work area are what's needed in a mold remediation clearance test if you want to trust the results.


Continue reading at CLEARANCE PROCEDURES where we give details of when, where, and how a post mold remediation job inspection and test should be performed, or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.


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