![\"\"](\"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-content\/uploads\/2026\/03\/DOC4-DeperditionChaleur.jpg\")
<\/p>\n1-Dans une maison individuelle non isol\u00e9e, les parts des d\u00e9perditions de chaleur sont:<\/p>\n
<\/p>\n
a-pour le toit: 25% \u00e0 30%<\/p>\n
b-pour les murs :20% \u00e0 25%<\/p>\n
c-pour l’air renouvel\u00e9 et fuites: 20% \u00e0 25%<\/p>\n
d-pour les fen\u00eatres: 10% \u00e0 15%<\/p>\n
e-pour les planchers bas: 7% \u00e0 10<\/p>\n
f-pour les ponts thermiques: 5% \u00e0 10%<\/p>\n
<\/p>\n
2-Une mauvaise isolation du toit (ou des combles) peut-\u00eatre d\u00e9tectable en hiver par temps de neige. La neige accumul\u00e9e sur les toits, fondra plus vite, d\u00e8s qu’une habitation pr\u00e9sentera un d\u00e9faut d’isolation au niveau de sa toiture. Voir exemple de la photo ci-contre.<\/p>\n
![\"\"](\"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-content\/uploads\/2026\/03\/DOC4-Toit-mal-isole.jpg\")
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3-Pour am\u00e9liorer le confort thermique d’une habitation, nous utilisons des isolants thermiques qui permettent de r\u00e9duire la quantit\u00e9 de chaleur transmise avec l’ext\u00e9rieur.<\/p>\n
Plusieurs types de mat\u00e9riaux isolants existent:<\/p>\n
4-On am\u00e9liore l’isolation thermique d’un mat\u00e9riau en augmentant son \u00e9paisseur. Pour une efficacit\u00e9 optimale, toutes les parois doivent \u00eatre isol\u00e9es<\/strong>. Pour une habitation, on isole les murs ext\u00e9rieurs, le plancher sur vide sanitaire et le plafond sous les combles (toiture).<\/p>\n 5-La performance thermique d’un mat\u00e9riau isolant s’appelle la r\u00e9sistance thermique R.\u00a0<\/strong>Plus R<\/strong> est grand et plus le mat\u00e9riau est isolant.\u00a0R<\/strong> d\u00e9pend de deux param\u00e8tres : en fonction de la conductivit\u00e9 thermique \u00b5 (lambda) propre \u00e0 chaque mat\u00e9riau et en fonction de son \u00e9paisseur\u00a0e.<\/strong> <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n Photo traditionnelle\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Image infrarouge<\/p>\n <\/p>\n Sur l’image infrarouge, plus la zone va vers la couleur jaune\/blanc, plus les d\u00e9perditions de chaleur sont importantes. Dans ce cas, le haut du toit ainsi que les planchers bas sont des zones de fortes d\u00e9perditions de chaleur (certainement un d\u00e9faut d’isolation).<\/strong><\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n Photo traditionnelle\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Image infrarouge avec cam\u00e9ra\u00a0FLIR Agema 550<\/strong><\/p>\n <\/p>\n <\/p>\n Maison en ITI<\/strong> :<\/p>\n I<\/strong>solation\u00a0T<\/strong>hermique par l’I<\/strong>nt\u00e9rieur<\/p>\n (apparition de ponts thermiques)<\/p>\n <\/p>\n <\/p>\n <\/p>\n Maison en ITE<\/strong> :<\/p>\n I<\/strong>solation\u00a0T<\/strong>hermique par l’E<\/strong>xt\u00e9rieur<\/p>\n (disparition des ponts thermiques)<\/p>\n <\/p>\n <\/p>\n Photos traditionnelles\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Images infrarouges<\/p>\n","protected":false},"excerpt":{"rendered":" 1-Dans une maison individuelle non isol\u00e9e, les parts des d\u00e9perditions de chaleur sont: a-pour le toit: 25% \u00e0 30% b-pour les murs :20% \u00e0 25% c-pour l’air renouvel\u00e9 et fuites: 20% \u00e0 25% d-pour les fen\u00eatres: 10% \u00e0 15% e-pour les planchers bas: 7% \u00e0 10 f-pour les ponts thermiques: 5% \u00e0 10% 2-Une … Lire la suite<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1054","post","type-post","status-publish","format-standard","hentry","category-table-5-groupe-2"],"_links":{"self":[{"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/posts\/1054","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/comments?post=1054"}],"version-history":[{"count":24,"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/posts\/1054\/revisions"}],"predecessor-version":[{"id":1180,"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/posts\/1054\/revisions\/1180"}],"wp:attachment":[{"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/media?parent=1054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/categories?post=1054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-json\/wp\/v2\/tags?post=1054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-content\/uploads\/2026\/03\/DOC4-Tableau-resistance-thermique.jpg\")
<\/p>\nThermographies infrarouges :<\/span>\u00a0<\/strong><\/h1>\n
![\"\"](\"https:\/\/www.saint-paul-angouleme.fr\/blogs4\/401\/wp-content\/uploads\/2026\/03\/DOC5-image1.jpg\")
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