Inside a mold-contaminated home, microscopic mold spores are often concentrated in the immediate vicinity of contamination. However, efforts to remove that mold run the risk of dispersing spores more widely. Known as cross-contamination, the process of removing active mold growth may potentially spread contamination to parts of the house not previously infected by mold.
Professional mold remediation services utilize a variety of tactics and equipment to ensure that cross-contamination doesn't disseminate mold more extensively inside a home during the procedure. Here are some of the methods commonly employed:
- Preliminary air sampling. Air sampling for spores provides important information about which areas of the home are contaminated versus those that are not. This allows mold remediation technicians to isolate particular target areas while preventing spread to areas that aren't contaminated.
- Sealing the area. If the contaminated area is more than 30 square feet, specific techniques are utilized to isolate the area from the remainder of the house. The work area will be air-sealed with sheets of 6 mil plastic barrier, including an air lock to enter and exit the area. HVAC vents in the affected area will also be sealed.
- Preventing mold spore spread. To further ensure that airborne spores do not migrate into uncontaminated areas, a negative air machine will be installed to reduce air pressure in the infected area. This device, which includes high-efficiency HEPA filtration, continuously reduces air pressure in the infected area to retain airborne spores.
- Restricting access. Only individuals who are trained and have proper mold remediation credentials, as well as equipped with proper personal protection equipment (PPE), should be allowed in the contaminated area while mold remediation procedures are underway.
- Final procedures. After active mold growth and any infected materials have been removed, and before the containment area is unsealed, the entire area is vacuumed with HEPA-filtered equipment. All surfaces inside the area will be wiped down with an antimicrobial cleaner. HVAC vents are unsealed.
- Post-remediation air sampling. To verify that mold has been removed from the affected area and all other parts of the house remain uncontaminated, air samples will be taken throughout the home.
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