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A/C Mold Issues

Project Report > Inspection for Mold due to Improper HVAC Maintenance

Inspection #: 201025

Reason for inspection:

  • Client performed some water damage work in home due to a frost broken hose bib on the front of the home.  Client had a different remediation company perform final cleaning and testing but feels like they botched the job.  Client requested an inspection of remediation areas to ensure job was done correctly and final clearance sampling.

Summary of concerns:

  • Significant amount of dust accumulations present in HVAC closet indicates the room was not adequately cleaned after remediation.
  • Elevated Penicillium/Aspergillus spore counts were found in the master bedroom.
  • Moderately elevated levels of Penicillium/Aspergillus were found in the HVAC closet in the basement.
  • Moderate cupping was still present on hardwood flooring in kitchen.

Project Report > Inspection for Mold from Inadequate HVAC System

Work #: 104024

Mold from Inadequate HVAC System

Furnace / HVAC

  • The property is heated primarily by electric wall heaters or radiant hydronic heating.
  • Homes that are not equipped with a forced air heating system must have special care taken to ensure appropriate ventilation, and prevent the buildup of humidity and other pollutants.
  • Current standards recommend 0.35 to 0.7 air changes per hour, this may be attained by installation of a ducted heat recovery ventilator or upgrading mechanical exhaust ventilation to function on a continuous flow.
  • The estimated square footage of this home is 1,075 sq.ft.


Mold in Bathroom

  • Replacement of the existing bathroom exhaust fan with constant flow models will improve ventilation as listed above.

Master Bathroom:

  • Obvious deformation to MDF baseboards near shower stall, likely secondary to a previous water issue that has been resolved.
  • Failure of caulking at shower to vinyl flooring connection.
  • Increased moisture content noted in vinyl flooring at area of failed caulking (encompasses less than 1 square foot).
  • History of large amount of condensation.
  • Bathroom exhaust fan not functional.
  • Obvious staining from soot and mold growth on ceiling and walls.
  • Inspection with FLIR did not reveal any areas of temperature differential that would suggest hidden water leaks.
  • RH: 42.6%     Temp: 68.8F     CO2 = 687ppm     CO = 0ppm


  • Clean all soot stained painted surfaces with TSP and repaint if necessary.
  • Replace damaged baseboards.
  • Repair caulking at vinyl flooring.

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