French homeowners urged to improve roof insulation for energy savings

Insulating a roof can cut up to 30% of a building's heat loss, boosting indoor comfort and lowering energy bills. French guides highlight that a few centimeters of well‑chosen material—such as polyurethane (PU), phenolic, PSE, XPS foam or natural options like wood wool, cellulose and hemp—can seal gaps, reduce thermal bridges and enhance airtightness.

Effective installation is crucial: the substrate must be sound, the application dense and free of air pockets, and professional expertise is often recommended. Costs vary with surface area, thickness and material type, but the long‑term savings and environmental benefits make the investment worthwhile for both new builds and renovations.

The guidance also outlines different approaches—interior insulation, exterior insulation and attic‑specific solutions—allowing homeowners to select the method that best fits their building layout and budget while complying with France's energy‑performance standards.