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) of Assessment: March 4, 11, 13, 22, and 24, 2025
A similar concern in a different space within the portable was under investigation at the time this concern was submitted. Additional information can be found in association with IEQ Concern #CXPRES2024000334. The concern associated with the other space will be referred to as Classroom 1 for the purposes of this report.
The interior of the ductwork (interior is fiberglass lined) was observed. No visible mold or malodors were identified within the ductwork. General dust was observed adhered to the duct lining, however this is not unusual as the fiberglass insulation tends to collect/trap dust.
Wood framing is located between each duct opening and the ceiling. The wood framing was visibly dirty/discolored.
There is an additional "vent" opening, not associated with the supply ductwork. This opening (normally covered with a metal supply diffuser) opens into the "attic" space above the classroom. An exhaust duct, presumably to assist in ventilating the "attic" space extends through the roof. Smoke testing was performed and indicated that air movement can flow from the attic into the occupied space, particularly on cold days. Once the HVAC is operational and the occupied space is warm, the airflow then changes and moves from the occupied space into the attic via a process known as the stack effect. This Office of the Environment considers this finding as a deficiency, as a significant nexus between an occupied/non-occupied space exists. This configuration may also be impacting humidity levels in the space.
A moisture sensor was used on the carpet. No elevated moisture was detected.
An infrared camera was used to attempt to identified thermal anomalies that could be indicative of moisture intrusion. No thermal anomalies indicative of moisture intrusion were identifed.
A moisture meter was used to determine the moisture level of the drywall in various locations (under windows and around the perimeter of the room (near floor)). No elevated moisture was detected.
Based on the findings in this space, the findings associated with IEQ Concern #CXPRES2024000334, and discussions with other occupants, corrective actions were planned for each classroom within the portable.
A board-approved restoration contractor cleaned the supply diffusers, in each classroom and cleaned/vacuumed the wood framing at each supply diffuser in the portable (excluding Room 1, which was already complete). After the cleaning, the wood framing was encapsulated.
Building Maintenance closed/sealed the opening to the "attic" space in each classroom. Ventilation will be added to the attic space that does not utilize a nexus between the attic/occupied space. Building Maintenance anticipates that work to be completed on March 29, 2025.
The Office of the Environment has added the portable to our "summer watch list." The Office of the Environment will monitor portable conditions through the summer. If additional dehumidification is necessary, this will be coordinated through the Office of the Environment.
The supply ductwork and return section was cleaned by a board-approved contractor as a precaution. The interior of the supply ductwork was encapsulated after the cleaning.