Mould Risk Calculator

Key Thresholds:

  • >90% RH: High mould risk
  • 75-90% RH: Moderate risk
  • <75% RH: Low risk

How to Use This Tool

1. Measure surface and air temperatures

2. Measure relative humidity

3. Enter values and click Calculate

4. View mould risk assessment and chart

Recommended Reading

Straight-talking guides to damp, defects and what surveyors miss.

Rising Damp: The Myth, The Mess, and the Real Fixes
Rising Damp: The Myth, The Mess, and the Real Fixes
Buy on Amazon Buy on Google Play
Buying a House – The Things Surveyors Miss
Buying a House – The Things Surveyors Miss
Buy on Amazon Buy on Google Play