Self-Assessment Tools

Practical guidance to help you understand mould and asbestos risk — and know when professional help is needed

1. Mould & Moisture Self-Assessment

Understand how humidity drives mould growth

Mould is not just a cleanliness issue — it is a moisture and building performance issue. Relative humidity (RH), ventilation, surface temperature, and material type all influence whether mould can establish and persist.

This self-assessment tool helps you:

• Understand mould-favourable conditions

• Identify early warning signs

• Take low-risk, preventative steps

• Recognise when professional assessment is recommended

2. Relative Humidity & Mould Risk Chart

(See Online Store)

Indoor Relative Humidity Risk Bands

Relative Humidity (RH)Risk Level Interpretation Below 50%✅ Low Risk Unfavourable for mould growth 50–60%⚠️ Mode rate Early mould risk on cool surfaces 60–70%❗ Elevated Mould likely on porous materials Above 70%🚨 High Risk Active mould growth likely

Key notes :

• Sustained humidity is more important than short spikes

• Cold surfaces (corners, windows, wardrobes) are higher risk

• Bathrooms, bedrooms, laundries, and south-facing rooms are common problem areas

3. Visual Mould Risk Assessment Matrix

(See Online Store)

Mould Likelihood Matrix

Moisture Level × Surface Type

Surface Type Low Moisture Moderate Moisture High Moisture Non-porous (tiles, glass)Low Moderate Moderate Semi-porous (painted plaster)Low Elevated High Porous (timber, carpet, plasterboard) Moderate High Very High

Supporting Information:
Mould prefers porous materials and poorly ventilated spaces. Visible mould often represents a broader moisture issue.

4. Simple Mould Self-Check (Checklist)

You may be at increased mould risk if you answer “yes” to two or more:

• Condensation forms regularly on windows or walls

• Musty or earthy odours are present

• Rooms feel damp or stale

• RH consistently above 60%

• Discolouration appears in corners, ceilings, or wardrobes

If unsure, professional assessment can confirm whether mould is present and whether remediation is required.

5. Asbestos Awareness & Sampling Pathway

Know the risk — choose the safe next step

Many building materials installed prior to 1990 may contain asbestos. Disturbing these materials without proper controls can present a health risk.

This section is designed to:

• Help users recognise suspect asbestos-containing materials (ACMs)

• Understand when sampling may be required

• Choose safe, compliant pathways for testing

Typical Materials of Concern

• Cement sheeting (walls, eaves, fences)

• Vinyl floor tiles and adhesives

• Textured coatings

• Roofing and backing boards

Important principle:

If a material is in good condition and undisturbed, it may not pose an immediate risk.

6. Safe Decision Pathways

If You Suspect Asbestos:

1. Do not disturb the material

2. Seek professional advice

3. Arrange testing via:

   • Independent occupational hygienist

   • NATA-accredited laboratory

Results help determine:

• Whether asbestos is present

• Risk level

• Management or removal requirements

7. Disclaimer

These tools are educational only.
They are designed to support awareness and early decision-making. Where health risks or regulatory obligations may apply, professional assessment is recommended.