Source google image: https://www.toutsurlisolation.com/var/toutsurlisolation/storage/images/media/images/choisir-son-isolant-les-isolants/les-isolants-isolants-polystyrenes-pse-xps-et-pur/75381-1-fre-FR/Les-isolants-Isolants-polystyrenes-PSE-XPS-et-PUR_reference.jpg
Isolant mince 4 cm
Source google image: https://www.toutsurlisolation.com/var/toutsurlisolation/storage/images/media/images/choisir-son-isolant-les-isolants/les-isolants-isolants-polystyrenes-pse-xps-et-pur/75381-1-fre-FR/Les-isolants-Isolants-polystyrenes-PSE-XPS-et-PUR_reference.jpg