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With proper engineering controls in place, a full invasive investigation was necessary because the issue was located within the wall cavity. This area was structural steel zone encased with Monokote fire proofing material. Monokote is very absorbent and holds onto moisture when saturated. The main source of odors was because the waste line inside the wall had been leaking a small amount for a long period, and the Monokote absorbed the leakage from the bathroom and wicked up more than two feet high on the Monokote and gypsum wallboard creating a welcome environment for microbial growth. This was the source of the reported odor. In expert terms: ew.


Remediation of this type required an Industrial Hygiene expert. Due to the sensitive nature of mold, after-hours work was deemed most appropriate in order to minimize risk of cross contamination. Also, because, nobody wants to see that.


With the bathroom closed to public access using environmental controls and HVAC system in place to maintain negative air pressure, fixtures and wall tiles were removed from walls and all affected areas.


The industry rule of thumb is to go two feet past any visible growth. Because the growth in this case the growth was quite thick, technicians climbed into the wall cavity and


scraped off the Monokote up on all the structural steel and used wire brushes to remove built-up corrosion. After the cleanup was completed, HEPA vacuuming of the area was repeated several times. I mean really, it was like they thought their mother was coming to inspect.


The experts also performed a damp-wipe of all materials in the wall using an EPA-registered disinfectant. Once the mold remediation was complete, dehumidification was set to help remove residual moisture in the area. The Industrial Hygienist ran air samples and did a “sniff” test to confirm it was now odor-free. By using source removal methods, the space passed IH exit evaluation and air sampling.


If you suspect a potential microbial issue within your building, be sure to seek out a reputable Indoor Environmental Professional (IEP) or Industrial Hygiene firm to inspect and test to locate the locate the damage. Be sure to contract qualified, trained and experienced mold remediation contractor with certified technicians for this work; and stay away from the convenience store burritos.


References


1 ANSI/IICRC S520-2015 Standard for Professional Mold Remediation (3rd Edition), ANSI/IICRC R520- 2015 Reference Guide for Professional Mold Remediation (3rd Edition) and the ANSI/IICRC Standard and Reference Guide for Professional Water Damage Restoration S-500-2015 (4th Edition).


www.wscai.org


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