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Environmentally Friendly Mold Remediation Techniques That Significantly Reduce Childhood Asthmamold growth are being remediated or when any destructivetechniques are used such as removing drywall, AC ducts or airhandler, partitions or carpets.Workers should handle contaminated materials in a manner thatminimizes disturbance of fungal particles, especially if removal mightuncover further contamination that has not yet been identified. Toprevent or minimize the dispersion of particles beyond the work area,containment (i.e., engineering controls) and special cleaning practicesare often necessary. This may include critical barriers (e.g.,polyethylene sheeting), depressurization techniques (e.g., negative airpressure machines or a fan placed in a window to direct air flowoutward), dust suppression methods (e.g., fogging, damp wiping,HEPA vacuum cleaning), and decontamination procedures (e.g.,showers, dirty rooms, and clean rooms).Make sure that any AC supply and return vents within thecontainment area are sealed. For further guidance on contaminantcontrol, refer to the documents listed in Appendix B or seek advicefrom experienced mold remediation professionals.In “Moderate” and “Major” problems, workers should “pre-clean” andthen moisten contaminated materials to minimize dispersion ofcontaminants once the containment is in place. Pre-cleaning involvescareful cleaning of easily accessible surface contamination withmethods that can lift and capture fine dusts.Our preferred method for pre-cleaning surfaces is to place a Wet Vacequipped with a drywall dust filter outside the building and, using along hose, micro-vac the mold contaminated surfaces.Then put small holes in the walls and place the vacuum on each holeand then tap the wall with a rubber mallet. Loose mold spores on theinside of the drywall will be exhausted outside thereby minimizing thespread of mold contaminants when the wall is removed.If this pre-cleaning procedure is followed by fogging the wall surfaceand wall cavities with a diluted disinfectant like Lysol ... there will beminimal disbursement of contaminants during material removal.72
Environmentally Friendly Mold Remediation Techniques That Significantly Reduce Childhood AsthmaNote that if the wall cavity is filled with insulation material the precleaningand fogging do not work.Depressurization of the work area should always be used to ensurecontaminants are confined within the work area. A pressuredifferential of > 5 Pa (0.02 inches water column), which is used forasbestos abatement, is usually adequate to contain airborne moldcontaminants. In addition, remediation workers and project managersshould routinely check to see that the separation barrier, typicallyplastic sheeting, billows inwards into the isolated area. The nozzle ofone or more HEPA vacuums drawing from within a smallcontainment area, or a fan in a window in the contained area pointedout, may provide adequate depressurization for small jobs.Note: Much emphasis is being placed within the industry on using airscrubbers within contained areas. Whenever possible, specialized axialfans and ducting (such as those made by Americ) to connect thecontained area to the outside are preferred to pull both dust-laden airand odors from the work area and exhaust them outside. The axial fansalso provide the negative pressure needed to isolate the containment areasand do not stir up the air inside the containment as do scrubbers.We recommend that air scrubbers only be used outside of containments.9.5 Cleaning and Removal of Contaminated MaterialsThe primary goal of effective mold clean-up is to capture and removecontaminants from the building. As a general rule, it is best to cleanand remove as much contamination as possible before the materialshave completely dried after the water event.The following guidelines should be followed for determining whichmaterials can be cleaned and salvaged versus which should bediscarded. The EPA reference in Appendix B includes several detailedtables on how to properly deal with a wide number of water-damageditems. One of the EPA reference tables is reproduced on the nextpage. As always, our guidelines and the EPA-detailed tables are onlygeneral "guidelines" and should be supplemented by advice fromprofessionals as needed. For instance, if there are sick people in the73
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White’s Second LawThe majority of
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Too Toxic to Use? Cont’d Some tim
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Green or Non-ToxicMany ‘Green’
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Cleaning Processes Washing can get
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RinsingRinsing is just as important
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Bleaching for EffectIf the surfaces
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Sealing of Cavities Sealing should
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Warrantees on Cleaning Warrantees o
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Ventilation & Humidity ControlAlmos
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