Home / Environment / Clay Shrinkage Threatens Millions of French Homes
Clay Shrinkage Threatens Millions of French Homes
2 Apr
Summary
- Over 54% of French detached houses face structural risks from clay shrinkage.
- Annual compensation costs for clay shrinkage damage reach €1 billion.
- Climate change intensifies extreme heat and rainfall, worsening RGA.
Millions of properties in France are at risk due to clay shrinkage-swelling, or RGA, a phenomenon intensified by climate change. Over 12 million homes are threatened, with more than half of the mainland facing medium to high risks. This issue particularly affects houses built since the 1970s, where shrinking clay soils during dry spells can compromise foundations, and swelling during wet periods exacerbates the damage.
The consequences of RGA are severe, impacting 54% of detached houses in France and costing approximately €1 billion annually in compensation. The government has identified vulnerable areas, with millions of homes in regions like Allier and Dordogne considered high risk. Global warming fuels this problem by increasing the frequency and intensity of heatwaves and heavy rainfall.
France has recently experienced extreme weather, including record-breaking heatwaves in the summer of 2025 and extensive rainfall leading to severe flooding in early 2026. These events highlight the ongoing threat of intense dry and wet periods. To address these challenges, the government is piloting the Argile prevention fund to conduct vulnerability assessments and implement preventative work on at-risk homes.
