Within a few years, more than three-quarters of homes could crack, study shows where they are

A real scourge in France, the cracks should be even more numerous within a few years. Certain regions will be particularly affected.

Seeing cracks on the walls of your house is never reassuring. One in two detached houses is already damaged. We are affected by such problems today and it is only getting worse. According to a study by the Consequences association and the climate risk assessment start-up Callendar, the long poles of the climate risk assessment system are being tested. Periods of drought are partly responsible. Homes sit on clay soil, which alternately expands or contracts depending on the moisture content, a phenomenon called shrinkage-swelling. clayey soils (RGA), their structures become unstable and tend to deteriorate. crack.

This study returned to the evolution of the phenomenon and made some rather worried projections. aunts. Between 2006 and 2022, the number of these disasters increased. in France by 145%. Such damage is also very expensive. In 2022, the Central Reinsurance Fund has assessed &agrav; 3.5 billion euros the costs for 7,000 municipalities recognized as being in a state of natural disaster. 

200% Deposit Bonus up to €3,000 180% First Deposit Bonus up to $20,000

35 years ago, this only concerned four regions: Occitanie, Nouvelle-Aquitaine, Centre-Val-de-Loire and Ile. -of France. Today, the Grand Est, Burgundy-Franche-Comté and Auvergne Rhône-Alpes are also strongly affected. The region whose share of the population is the most affected remains Centre-Val-de-Loire with 1,720 million inhabitants exposed. eacutes in medium or high hazard zones, i.e. 67% of the population. 3.4 million inhabitants of Ile-de-France are also affected but this only represents 28% of the population in view of the density.

Population affected today and forecast for 2050 © Callendar

By 2050, the figures could skyrocket: three quarters of individual houses could thus be affected . Thus, regions with very little exposure today, such as Brittany or Normandy, could become more exposed in the years to come. come and see their loss ratio increase by more than 100%.

By crossing the figures from INSEE, BRGM (Bureau de recherche geologique et minières) and IGN (National Institute of ;#39;geographic and forestry information), the study concluded that more than 20 million French people would be exposed to s à RGA risks. In a low scenario  In an additional 2 degrees by 2050, 13.6 million homes would find themselves facing the risk of overheating. such problems à a level of average &agrav; very loud. This represents 77.5% of the individual housing stock, therefore more than three quarters of houses. A rehabilitation of these housing seems inevitable.

Callendar put à provision of a  questionnaire which allows à everyone to know the risks of cracks for their home by providing their address and a few other criteria such as the shape of the building or the presence or absence of a basement .