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LEARNING · IICRC S520 CONCEPTS

Mould basics:
Conditions 1, 2 & 3

Plain-English guide to how restoration professionals describe mould contamination in a building. Condition describes what is on and in the materials — it is not a medical diagnosis.

Overview

What “Condition” means

In mould remediation, Condition describes how contaminated an indoor area is with mould and mould-related particles. It guides containment, cleaning, removal and verification while giving restorers, insurers and hygienists a shared language.

  • Condition 1 — normal indoor fungal ecology for that building
  • Condition 2 — settled spores and fragments elevated above Condition 1, without actual growth
  • Condition 3 — actual mould growth is present
Remember: Mould remediation without correcting the moisture source is incomplete. S500 water Category/Class and S520 mould Condition answer different questions.
Condition 1

Normal fungal ecology

An indoor environment consistent with a well-maintained building: mould and related particles remain at normal background levels without evidence of amplification from water or humidity.

  • No visible mould growth attributed to the loss
  • No growth-associated odour tied to wet materials
  • Surfaces and air consistent with a clean, dry indoor space
Condition 1 is the practical goal after remediation and drying — a normal indoor ecology, not a sterile building with zero spores.
Condition 2

Settled spores and fragments

Settled spores, fragments and related particles are elevated above Condition 1, but actual mould growth is not present on those surfaces. This can occur beside a Condition 3 area or after poor containment and disturbance.

  • Often found adjacent to active growth
  • Can follow demolition, air movement or inadequate containment
  • Usually requires detailed cleaning, commonly with HEPA controls
Condition 2 cleaning will not hold if active Condition 3 growth and the moisture source remain nearby.
Condition 3

Actual mould growth

Actual mould growth is present on materials, either visibly or confirmed in a concealed area. This Condition commonly drives material-removal, containment and verification decisions.

  • Growth on plasterboard, timber, skirtings, ceilings or contents
  • Growth inside walls, beneath floors or behind joinery
  • Porous materials with growth may require removal; sound non-porous materials may be cleanable
Condition 3 remediation commonly uses containment, controlled demolition, HEPA vacuuming and detailed cleaning, followed by drying and verification.
On site

How Condition guides the job

  • Find and stop moisture — leaks, storms, humidity or HVAC overflow
  • Assess each area — one building can contain different Conditions
  • Contain — protect clean rooms and HVAC pathways
  • Remove or clean — manage materials according to contamination and salvageability
  • Dry and document — moisture readings, photographs and scope notes
  • Verify — visual and moisture checks, with clearance sampling where required
Learn Water Categories & Classes
Test your knowledge

Seven quick mould questions.

Submit your answers to see the score and explanations.

1. Actual visible mould colonies on plasterboard are best described as:
2. No growth, but settled spores from a mouldy room next door, is often:
3. Condition 1 means:
4. Can active Condition 3 growth remain while only the adjoining room is cleaned?
5. Which pair is accurate?
6. The practical post-remediation goal is generally:
7. Why is moisture control essential?

Dealing with mould on a real job?

We assess Condition by area, explain containment and material decisions, and partner with you through the claim.

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