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Recent Inspection Report Involving 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.

Summary of recommendations:

  • Recommend performing a thorough cleaning of the HVAC Closet with HEPA vacuums and a wipe-down of all solid surfaces with an EPA registered antimicrobial solution.
  • Recommend a minimum of 48 hrs of negative pressure, HEPA air scrubbing of upper level of home.
  • Perform indoor air quality testing after air scrubbing has been completed.


Recent Inspection Report Regarding 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 recommended units for this method is a Panasonic Whisper Green exhaust fan).
  • The estimated square footage of this home is 1,075 sq.ft.
  • The necessary flow rate to establish 0.35-0.7 ACH for this home is 57-114CFM.


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.
  • No obvious plumbing leaks noted.
  • 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.
  • The exhaust ventilation in this area is inadequate, it is recommended that a Panasonic Whisper Green 80CFM exhaust fan be installed and set to run at 30-60CFM continuous flow, and for 60 minutes at 80CFM once motion-sensor has been activated.