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Ventilation, moisture and HVAC

Ventilation and moisture: control causes before multiplying devices

Ventilation dilutes and removes some contaminants, but it does not fix a leak, dust source or poorly captured process. Assessment connects airflow, occupancy, pressure, maintenance and sources.

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RSBQ professional fieldwork — Ventilation, moisture and HVAC

Measure what answers the question

CO₂ is a contextual indicator of occupancy-related air renewal; it does not represent every contaminant.

  • Actual occupancy
  • Outdoor-air rates
  • Temperature and humidity
  • Pressure between zones
  • Particles and targeted sources

Maintain the entire air path

Intakes, filters, coils, drains, humidifiers, ducts, dampers and control sequences must operate as one system.

  • Access and cleanliness
  • Suitable filtration
  • Drainage without stagnation
  • Schedules and purges
  • Balancing

Adapt criteria to the building

Residential, commercial, school, care and industrial buildings do not use the same objectives or competence.

  • ASHRAE 62.1 for non-residential
  • ASHRAE 62.2 for dwellings
  • Adopted Québec requirements
  • Industrial source capture
  • Specialized care protocols

RSBQ field guide · Moisture and mould

Questions a serious file should answer.

Context determines the method. These guideposts help distinguish a structured investigation from a simple collection of results.

01

Where is the water coming from?

Leak, condensation, infiltration, loss event, drainage or indoor humidity.

02

What is the real extent?

Visible surfaces, plausible concealed materials, odours, cavities and adjacent areas.

03

Who requires protection?

Vulnerable occupants, workers, clean zones and continuity of occupancy.

04

When is work closed?

Source corrected, materials addressed, cleanliness, drying and verification documented.

Minimum deliverables
  • Assignment and assessed areas
  • Method and conditions
  • Competence and instruments
  • Results and observations
  • Limitations and uncertainty
  • Decision, correction and follow-up

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