External Wall Insulation Gains Traction in France as Old Stone Homes Stay Cool

External wall insulation (ITE) is promoted in France as a way to improve the thermal envelope of existing buildings without reducing interior space. The method coats the façade continuously, treats floor‑wall junctions and window reveals, and reduces thermal bridges. Common ITE solutions include insulated render (PSE), rock‑wool under ventilated cladding, and polyurethane panels, each differing in cost, thickness and fire performance. When installed by an RGE‑certified professional, homeowners can access financial aid such as MaPrimeRénov’ to offset renovation expenses.

Older stone houses also benefit from natural thermal inertia. Thick masonry walls store heat slowly, keeping interior temperatures up to 10 °C lower than outside during heatwaves, even without air‑conditioning. Features such as small windows, high ceilings and night‑time ventilation further enhance comfort. The combination of historic building techniques and modern ITE offers a durable, energy‑efficient solution for French residents facing rising summer temperatures.