Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Bardage_l%C3%A9gend%C3%A9%2Btitr%C3%A9_S.jpg/220px-Bardage_l%C3%A9gend%C3%A9%2Btitr%C3%A9_S.jpg
Coefficient d’isolation thermique wikipedia
Source google image: https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Bardage_l%C3%A9gend%C3%A9%2Btitr%C3%A9_S.jpg/220px-Bardage_l%C3%A9gend%C3%A9%2Btitr%C3%A9_S.jpg