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Mould and moisture

Mould in buildings: find the cause before correcting the damage

Mould growth usually indicates a water or moisture issue. The priority is to identify and correct the cause, then plan remediation suited to the affected area and materials.

RSBQ professional fieldwork — Mould and moisture

Identify the moisture source

Leak, infiltration, condensation, water damage or insufficient ventilation: the mechanism should be understood before corrective work begins.

  • Water-damage history
  • Possible moisture pathways
  • Affected materials
  • Temperature and ventilation
  • Hidden contamination risk

Define the extent

The inspection documents affected areas and materials. Sampling may support the investigation when a precise question justifies it, but it does not replace inspection.

  • Observations and photographs
  • Moisture readings
  • Controlled exploratory openings
  • Targeted sampling when relevant
  • Recorded assumptions and limits

Remediate and verify

The work area, methods, occupant protection and waste management should be planned. Final verification examines the completed work and control of the source.

  • Risk-appropriate containment
  • Material removal or cleaning
  • Dispersion control
  • Post-work inspection
  • Closure documentation

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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