Does Cleaning Mold from Carpet Work?

Does Cleaning Mold from Carpet Work?

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There is considerable confusion in the minds of restoration professionals regarding the proper approach to carpets that are part of a water loss where visible fungal growth is present. While it is the practice of many organizations to clean carpets subjected to Category 3 water loss, despite the potential for sickness from biological contamination in the water that is extracted prior to cleaning, there is greater hesitation in addressing wet carpet with visible colonies of fungus. Part of this hesitation lies in the nagging concern that standard cleaning protocols for carpets may not be removing all the fungal organisms. Unless the mold is properly removed, the restoration contractor is failing in their duty to return the structure to a pre-loss condition.

Real World Test

In the fall of 2018, an opportunity to evaluate the effectiveness of carpet cleaning procedures and chemistry for fungal contamination situations became avail-able to Wonder Makers Environmental. One of our clients had a good-sized office building (approximately 14,000 square feet) that was dormant as they awaited a new tenant. The maintenance staff checked the building on a monthly basis to make sure no problems arose and were surprised in September when they entered and were immediately assaulted with a dank, musty odor. Moving from the tiled vestibule to the main part of the structure revealed the source of the odor: fungal growth on the carpet in virtually every part of the building.

Since mold contamination is the symptom, the maintenance crew began looking for the cause; some source of water intrusion or high humidity. Soon, they were walking on squishy carpet and following the water trail back to a water heater closet. Although the review sched-ule confirmed the leak was less than 30 days old, conditions in the building suggested the water heater had been mal-functioning for weeks.

Images one through five provide some representative images of the condition of the building with one of the most obvious signs that water had been coming out of the heater for quite some time: the presence of mushrooms growing from the carpet. The main lobby shown in figures one and two had the most fungal colonies as well as the colonies that were largest in size. Many of the fungal colonies on the carpet throughout the building showed various colors, but laboratory analysis indicated they were primarily Aspergillus/Penicillium-like molds.

Initial Assessment

After conducting a general survey of the structure and shutting off the source to the water heater, the decision was made to have a professional assessment of the situation conducted. In addition to a visual review, both representative air and surface samples were collected in order to form the basis for a scope of work.

At first glance, the results of the spore trap air samples were not that “bad”. The indoor fungal levels were all lower than the comparison outdoor sample. How-ever, a deeper review told the real story.

The high outdoor spore level was typical for the location and the season with nearly 90 percent of the recovered mold spores identified as ascospores, basidiospores, and Cladosporium. The mold most prevalent on the carpet, Aspergillus/Penicillium-like spores, accounted for less than 5 percent of the outside spore load. In contrast, the percentage of Aspergillus/Penicillium-like spores found on the interior sample ranged from 10 to 51 percent of the total. These high per-centages in the air samples were an obvious reflection of the presence of those types of molds on the floor. The extent of mold on the carpet resulted in the laboratory classifying the contamination as “Category 5”, their most serious rating.

The analysis sheet also noted that the floor sample, which was collected with a Bio-Tape, contained fungal material estimated at an astound-ing 90-99 percent of the sample constituents. It further indicated that 50 per-cent of the fungal materials were spores of Aspergillus/Penicillium-like molds and the other 50 percent were hyphal mate-rial. Overall, a very high level of spore producing structures was observed.

The good news in the situation was the fact that the carpet is a commercial grade with no natural fibers glued directly to the concrete slab. The small area of carpet around the water heater that was soaked and supporting mush-room growth was slated to be removed as part of the mold remediation of the mechanical closet. But, that amounted to only 500 square feet, with the rest of the carpet supporting mold growth due to elevated levels of humidity in the building.

The Remediation Approach

All of this data led to the decision to clean the majority of the carpet rather than remove it. Nevertheless, the cleaning had to be conducted as a mold remediation project to guarantee the safety of the remediation crew and to ensure the carpet was returned to a “pre-loss condition”. Given that approach, the well-respected mold remediation method of “HEPA sandwich” cleaning was adopted into the project work procedures (HEPA sandwich refers to a three-step cleaning process with wet cleaning “sandwiched” between two thorough cleanings with a HEPA-filtered vacuum).

The work procedures indicated that the initial HEPA vacuuming of the carpet should be conducted by individuals trained in mold remediation procedures and with the individuals utilizing appropriate personal protective equipment.  Protective body covering, gloves, and respiratory protection with an N-100 filtering face piece were laid out as the minimum safety gear. The carpet cleaning also involved the removal of all unnecessary materials from the areas to be cleaned; especially the debris in some of the offices and hallways.

Since HEPA vacuuming with overlap-ping strokes of the vacuum floor tool was designated as the initial response to the mold, the work procedures were adamant that no beater bar or other attachments that create substantial agitation would be used. Following the initial vacuuming, hot water extraction of the previously vacuumed carpet using an EPA-registered antimicrobial specifically designed for carpet cleaning was re-quired. Use of a truck mount system was strongly recommended in order to apply hotter water and greater extraction suction to the carpet than what is normally provided by portable units.

The third piece of the sandwich in-volved quick drying of the cleaned carpets through the use of dehumidifiers, HEPA filtered negative air machines set up to run as air scrubbers, and floor fans. A second HEPA vacuuming of the carpets once they were confirmed to be dry was also conducted.

Product Selection

Finding an EPA-registered antimicrobial specifically designed for carpet cleaning that would work effectively on mold was tricky. After reviewing a presentation by three professors at Georgia State University entitled “Cleaning-Sanitizing of Carpet Tile: Protocol Development and Health Perspectives”, a decision was made to utilize a two-part cleaner called Bio-Oxygen Carpet Cleaner manufactured by Artemis Bio-Solutions Inc.* Figure 6 shows the results from one of the tests conducted using that product which indicates no microbial growth occurred following the cleaning.

The building owner turned execution of the work procedures over to a local SERVPRO franchise. Figure 7 shows the key step in the middle of the HEPA sandwich underway. Note the HEPA air scrubber operating in place to both collect airborne spores that may have been liberated by the hot water extraction and to provide a source of air movement to accelerate the drying of the carpet.

Post-sanitizing culture of IPS 48 carpet

Impressive Results

Once the carpet cleaning was finished, the cleaned areas were subjected to a detailed visual inspection. Seven of the eight areas were exceptionally clean and sampling of those sections of the build-ing was done. One of the areas failed the visual review, but not because of the cleaning protocol. The workers conducting the remediation in the negative pressure enclosure used an inside hallway for access; their foot traffic on the newly cleaned carpet forced a re-cleaning of that section of the building.

Figures 8 and 9 are photos of the post remediation sampling.

Post Remediation - Photo 7
Post Remediation - Photo 8
Post Remediation - Photo 9

Once again both spore trap air samples and Bio-Tape surface sample were collected following the visual inspection. The spore trap samples were taken at floor level rather than the normal breathing zone height in order to create a worst case scenario in regards to the carpet cleaning. In the main lobby, the area most heavily impacted with carpet mold, the air sample results went from 6,028 spores per cubic meter of air (s/m3) with 5,500 0f those being Aspergillus/Penicillium-like spores to 48 total s/m3 with zero Aspergillus/Penicillium-like spores. The surface sample results were equally as impressive.

While this is only a single case study, the approach taken and the information collected should serve as a clear indication that mold contaminated carpets can be successfully cleaned. The key lessons of using personal protective equipment for workers involved in the initial HEPA vacuuming, treating the work as a mold remediation project, and choosing the equipment and chemicals that have a documented history of success in eradicating fungal contamination are ones that can benefit the entire industry.

The Value of Health

In the last 20 years, mold remediation has gone from the “new kid on the block” to an established  subsection of the restoration industry. However, one of the things that sets mold remediation apart from responding to water losses and fires is the medical component tot many mold cases. In an odd twist, as we get and keep our buildings cleaner, and spend more time inside, a larger percentage of individuals develop sensitivities to indoor contaminants such as mold. A review of the current medical data explains that the percentage of the population with genetic predisposition to mild mold sensitivity is nearly 20%. Of that group, 1-3 % can develop a much more severe sensitivity to mold exposure.

Mold Sensitivity Is a Reality

Sadly, the trigger to real health problems for individuals who do not know that they are genetically susceptible to mold issues is often a poor mold remediation project. Whether the sensitivity comes about because of a long-term exposure to smaller amounts of mold from an undiagnosed or unaddressed water/mold issue, or a big exposure from poor remediation which is not properly isolated, the medical effects are real. In addition to typical allergy symptoms such as watery eyes, runny nose, sneezing, coughing, and headaches, people that become sensitized to mold can experience a whole range of seemingly unconnected symptoms. It is not uncommon for the mold sensitized individuals to experience debilitating symptoms such as excessive fatigue, abdominal issues, mood swings, blurred vision, memory and concentration problems, vertigo and balance issues, and a host of other problems.

(Illustration 1 is an expanded list of symptoms often experienced by individuals who become sensitized to mold, but it is by no means complete.)

While there is a growing cadre of medical professionals who recognize the importance of diagnosing mold sensitivities and controlling exposure to fungal contaminants, such health problems are not yet in the mainstream of the consciousness of medical professionals. The frustration that mold sensitized individuals go through in finding the right medical professional to assist them is matched only by the frustration they experience with mold remediation contractors who do not understand that remediation for mold sensitized individuals is different than most other projects. Although the same primary steps are completed, the remediation effort has to be done with attention to detail that is far greater than standard remediation and reconstruction work.

A Specialized Niche for Mold Remediation Contractors

If improper or incomplete mold remediation actually causes the sensitization, the remediation contractor needs to respond properly. Once the sensitization has occurred, the first step in assisting the ill individual is to stop dismissingthe client’s concerns as bogus. For mold professionals who want to properly evaluate and correct the problems that bedevil sensitized individuals, it is critical that they work with, or assemble, a team to assist the sensitized occupant (see Illustration 2). Indeed, some of the most successful remediation contractors and consultants currently working with mold sensitized individuals are the ones who have carefully evaluated the resources in the area and assembled a team of like-minded professionals who have the goal of helping these especially vulnerable clients get through the process as safely as possible.

Although substantial progress has been made in the last two decades in developing appropriate procedures, industry guidelines, and even regulations regarding mold remediation, most of those efforts have been directed toward remediation that produces an environment that is safe for typical occupants. However, experience has shown that such “standard” remediation projects, even when done in full compliance with the current industry standard of care, often are not enough to create a safe environment for individuals who have become sensitized to mold.

The most common problem with typical mold remediation projects is that the scope is not broad enough. Illustration 3 shows the large variety of different factors that need to be addressed when dealing with mold sensitized individuals. Too often, a mold remediation project deals with the visible source and fails to address secondary contamination of contents, unimpacted surfaces, the HVAC system, and even the overall performance of the structure. Restoration contractors that also have a rebuild division can find the work with mold sensitized individuals to be both challenging and rewarding because they can fix the existing problems and make corrections to the structure that prevents problems from developing in the future.

Most projects involving mold sensitized individuals require a full structure cleaning as one of the last steps. Specifically, after the source material removal, HVAC cleaning, and content decontamination have been addressed, residual contamination remains. Adjustments to the standard “HEPA sandwich cleaning technique” are often required to meet the stringent standards utilized to evaluate the effectiveness of a full house cleaning for mold sensitized individuals.

One of the most critical aspects of working successfully with sensitized individuals is knowing that the typical criteria used to evaluate project success are generally not good enough. Comparing indoor spore levels to out­of-doors and having fewer inside often fails to bring relief to the client because the contractor is returning

the structure to a “normal fungal environment.” However, sensitized individuals generally have to have an environment after the work is completed which is clearer than normal. Although a variety of techniques can be used to evaluate the work area and/or whole structure after cleaning, the criteria used to gauge the results needs to be clearer understood by all the parties before work begins.

Another important factor that should not be overlooked is that a quick glance at the chart reinforces the importance of developing the team approach in addressing the multiple problems of the client. Too often, the contractor who wants to help, and shows some competence in this specialized area, becomes “the answer” for the client. That quickly will put the restoration contractor in the dangerous position of trying to answer questions that should be addressed by medical professionals, assessors, and even a banker.

The Problem Is Real, Contractors Can Help and Add to Their Book of Business

A small subset of mold remediation assessors and contractors have figured out how to be successful in

the specialty market of mold remediation for sensitized individuals. Rather than just being frustrated by the mold situation that is often described as in”.olving a “crazy” person, these assessors and remediators have built on the standard remediation protocols to make them more effective for individuals who are physically unable to tolerate even small amounts of fungal contamination.

There are many sampling options that can be used for projects with sensitized individuals. Regardless of the inspection/sampling technique, clear endpoints have to be established and communicated before work begins.

Air samples can include:

  • Particle counter
  • Culture plates that collect spores
  • by impaction or settlfng
  • Spore trap using different types of cassettes
  • Electronic instruments that actually categorize mold spores as compared to dust (such as Instascope)

Surface samples can include:

  • Environmental Relative Moldiness Index (ERMI)
  • Tape lift

Surface samples can’t include:

  • Nasal swabs for viable spores
  • Urine samples for Mycotoxins
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