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Less Than 10 Square Feet of Mold (Rule?) Part 1

Jason Yost • Dec 05, 2022

Less Than 10 Square Feet of Mold (Rule?) Part 1

When I first moved to Florida, I heard many mold assessors and mold remediators state that “if there’s less than (<) 10 continuous square feet of mold growth you don’t need a mold assessment”. Other mold assessors and mold remediators went so far as to say Personal Protective Equipment (PPE) and engineering controls (e.g., air filtration devices and containment barriers) aren’t necessary if there’s <10 square feet of continuous mold growth. Are these claims true? And what does the answer to that question mean to you? In this and my follow up blog, I’ll answer these questions. 

mold growth on wall

Not one to speak out of line, I spent a lot of time with experts with the Florida Department of Business and Professional Regulation (DBPR), environmental and occupational safety and health lawyers for the State of Florida and the Occupational Safety and Health Administration (OSHA), as well as some past presidents of the Indoor Air Quality Association (IAQA). While I have years of experience working on mold-related legal claims, I didn’t want to overlook something that collaboration with these experts would provide in my analysis of the Florida Mold-Related Services Licensing Law (hereafter referred to as The Law). The result of that collaboration has confirmed my own analysis of The Law and highlighted something everyone in Florida should know – for the protection of their health and well-being, the justification of mold-related expenses, the protection from conflict-of-interest practices, and the protection from predators coming into Florida to profit from natural disasters. 

Are these claims true?

No.

Where these claims originated, I can’t say. But I’ve heard them by more licensed mold assessors and mold remediators than I haven’t. I’ve, even, sat through a couple of very popular continuing education courses for licensed mold assessors and mold remediators, who stated the very same things. That said, let’s look at what The Law says and doesn’t say about these things: 

The Law:

The first thing one needs to understand is what The Law is and isn’t. It isn’t a procedural standard (i.e., it doesn’t provide principles or procedures for mold remediation or assessment), like the Institute of Inspection, Cleaning, and Restoration Certification (IICRC) S520 Standard for Professional Mold Remediation. It is a law that establishes the following: 

  1. Circumstances whereby a license is required to perform a mold assessment or mold remediation;
  2. The criteria and process to license someone as a mold assessor or mold remediator;
  3. Processes for departmental review and revocation of one’s mold assessor or mold remediator license; and,
  4. Places the responsibility for daily execution of The Law to the DBPR’s construction division. 

Nowhere in The Law does it state that if there’s <10 square feet of continuous mold growth a mold assessment isn’t required by the State of Florida. 

<10 Square Feet of Mold

misunderstanding the Florida mold law

Perhaps the confusion lies in the misreading of The Law? If so, it would be because people fail to understand the expressed purpose of The Law and how to apply 468.8411 Definitions to The Law, itself. The Law defines mold remediation and mold assessment as the activities provided by a licensed mold remediator or mold assessor, clarifying that, as part of those circumstances whereby a licensed professional shall be employed in Florida, such circumstances include situations where “mold growth of greater than 10 square feet” is present “that was not purposely grown at that location”. Several things to understand: (1) the word continuous is not used in The Law, (2) The Law is only concerned with defining those activities requiring licensure for mold remediation or mold assessment, (3) The Law doesn’t state that, although licensure may not be required under The Law, mold assessments aren’t necessary, and (4) The Law doesn’t state that the “mold growth of greater than 10 square feet” be visible, a combination of invisible and visible, or whether known, suspect, or potential is implied.

So, logically, when one is concerned about the condition of the home or office, one wants to understand several things, such as but not limited to the presence, type, and extent of mold contamination in the building. In some cases, this can only be understood by having a professional mold assessment performed. (See my previous blog on what makes for a professional mold assessment and the standard that governs that process.) Allow me to share with you a real example: 

mold in ceiling cavity

We were contacted by a condominium owner in Panama City Beach, who stated that some mold was found between the first-floor living room and the second-floor air handler closet after a small portion of the ceiling drywall collapsed. As you can see by the picture to the right, the extent of visible mold colonization was <10 square feet. What you can’t see from this photograph (or by walking the property) is the airborne mold spore population in the neighboring room. During our assessment, we were concerned that there was a potential for poor indoor air quality (IAQ) due to dispersion of mold from the fallen ceiling drywall. Samples were collected in the kitchen (the only other first-floor room) and the upstairs landing. While the upstairs landing’s IAQ was acceptable, the kitchen wasn’t. Had the building owners ignored the need to define the extent of mold contamination in the condominium (based on the false premise that when there’s <10 square feet of continuous mold growth a mold assessment isn't necessary) the extent of mold contamination would never have been defined. 

The Question of PPE & Engineering Controls:

This leads us to the later part of the Florida mold industry’s claims: That when there is <10 square feet of continuous mold growth PPE and engineering controls aren’t necessary. Because this blog is getting long, I’ll write on this topic in my next blog post. In the meantime, if you have questions and would like to learn more about how Gulf Coast Center for Indoor Air Quality Services can serve you, contact us here

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