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Pilot 2

Addressing gaps in insurance cover for clay shrink swell

Pilot lead: Sustainable Finance Observatory
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This pilot focusses on the problem of property damage caused by clay shrink swell events and raising homeowner awareness of the potential financial risks associated with inadequate insurance cover. There is currently a significant challenge with a lack of understanding regarding the potential financial implications associated with this hazard. This phenomenon poses a substantial threat for homeowners as the property damage can range from minor cosmetic damage to serious structural issues, often requiring costly repairs. Many areas in Europe have high clay content in the soil and are potentially at risk and the level of risk is projected to increase due to climate change. At the same time there is a clear gap in insurance cover for property damage caused by these events. Our goal was to create an online dashboard that educates and empowers homeowners to manage their financial risks effectively from gaps in insurance cover.



During PIISA, our main objectives were the following:

  • Develop a methodology for illustrating the potential financial losses in the event of property damage caused by a clay shrink swell event occurring.
  • Design a web dashboard to educate homeowners in relation to their insurance cover that employs the above-mentioned methodology.
  • Provide guidance for homeowners on steps they can take to mitigate their risk.


We developed a tool called the Clay Shrink Swell Building Damage Assessor, or CSSBDA. This is a web-based tool designed to communicate financial and related risks to homeowners in a clear and accessible way. The pilot began with defining the tool's specifications. It was then developed and tested in the city of Lyon, before being scaled to the national level in France.

At the same time, additional research was carried out to assess CSS risk and insurance frameworks across other EU countries. This research forms the basis of a Risk Alert Briefing addressed to key stakeholders and designed to support informed discussion among policymakers, regulators, insurers and public authorities on the implications of climate-driven CSS property damage for housing resilience, insurance markets and climate adaptation.





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