Identify deficiencies that may impact IEQ and/or sources of odor concerns. Typically includes the following depending on the nature of concern, but not limited to:
- interview/questionnaire of concern individual(s)
- inspection above drop ceiling (condition of roof deck, pipe insulation, return air plenum)
- inspection of ventilation system (operation of variable air volume box and outdoor air dampers, check controls, measurements of carbon dioxide, temperature and relative humidity, sources near outdoor air intake, measure return and supply air volume, cleanliness of coils, liner and condensate pan)
- inspection of exterior
- inspection below drop ceiling (housekeeping, sink and floor drain traps, signs of past and present moisture concern via visual and/or moisture meter, mold growth, ensure connection of current and capping of abandoned sanitary vents, odorizers, excessive plants and fabric items, identify potential pathways, and measure volatile organic compounds, carbon monoxide, and lighting)
Date(s) Investigated: August 16, 22, 28, and November 19, 2018
The Office of the Environment was alerted to the concern while at the school for another purpose (August 16, 2018).
A preliminary assessment was performed and an odor was sensed.
No mold growth was observed on surfaces or above the drop-ceiling.
Building Services (HVAC) had assessed the Roof Top Unit (RTU) servicing the room. No concerns were identified.
Other rooms within the same HVAC zone did not have an odor.
The odor appeared more concentrated above the drop-ceiling.
A thermal imagery survey was performed and a significant thermal anomaly was noted in association with the roof deck.
Building Services scheduled a roofer (the contractor that installed the roof) to remove a portion of the roof in the location of the thermal anomaly.
The contractor identified suspect mold growth on the underside of the roof membrane, wet wood, and wet insulation. The suspect mold was cleaned by the contractor. The wet wood and wet insulation was removed and replaced.
The cause of the moisture intrusion was identified and corrected by the contractor.