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Mold growth on gypsum wallboard--a summary of three techniques
M Y Menetrez1, K K Foarde, T D Webber
1U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Air Pollution Prevention and Control Division, Research Triangle Park, NC 27711, USA. menetrez.marc@epa.gov
Abstract:
Reducing occupant exposure to mold growing on damp gypsum wallboard and controlling mold contamination in the indoor environment was studied through 1) delineation of environmental conditions required to promote and avoid mold growth and 2) efficacy testing of antimicrobial products, specifically cleaners and paints, on gypsum wallboard (GWB) surfaces. The effects of moisture and relative humidity (RH) on mold growth and transport are important in avoiding and eliminating problems. These effects have been demonstrated on GWB and are discussed in this article for use as control guidance. The authors discuss the efficacy of antimicrobial cleaners and paints to remove, eliminate, or control mold growth on GWB. Research to control Stachybotrys chartarum growth using 13 separate antimicrobial cleaners and nine varieties of antimicrobial paint on contaminated GWB was performed in laboratory testing. GWB surfaces were subjected to high RH. GWB control measures are summarized and combined, and the antimicrobial product results are explained.
Insights
This study investigated mold growth on gypsum wallboard (GWB), identifying conditions to prevent it and testing antimicrobial cleaners and paints to control mold contamination in indoor environments.
Area of Science:
- Environmental Science
- Microbiology
- Building Science
Background:
- Mold contamination in indoor environments poses health risks.
- Damp gypsum wallboard (GWB) is a common substrate for mold growth.
- Controlling mold requires understanding growth conditions and effective treatments.
Purpose of the Study:
- To delineate environmental conditions conducive to and prohibitive of mold growth on GWB.
- To evaluate the efficacy of antimicrobial cleaners and paints in controlling mold on GWB surfaces.
- To provide guidance for preventing and managing mold contamination in indoor spaces.
Main Methods:
- Laboratory testing of mold growth on GWB under varying moisture and relative humidity (RH) conditions.
- Efficacy testing of 13 antimicrobial cleaners and nine antimicrobial paints against Stachybotrys chartarum on GWB.
- Analysis of environmental factors influencing mold growth and transport on GWB.
Main Results:
- Specific moisture and RH levels were identified as critical for mold growth on GWB.
- Antimicrobial cleaners and paints demonstrated varying degrees of effectiveness in controlling mold.
- Results provide data for selecting appropriate control measures for GWB mold.
Conclusions:
- Understanding environmental triggers is key to preventing mold on GWB.
- Antimicrobial products can be effective tools for mold remediation on GWB.
- Integrated strategies combining environmental control and product application are recommended for indoor mold management.
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