{"id":2632,"date":"2026-10-20T08:00:00","date_gmt":"2026-10-20T08:00:00","guid":{"rendered":"https:\/\/biomattone.it\/?p=2632"},"modified":"2026-10-20T13:34:11","modified_gmt":"2026-10-20T13:34:11","slug":"transmission-thermique-du-biomattone-comment-interpreter-u-et-rt-pour-chaque-format","status":"publish","type":"post","link":"https:\/\/biomattone.it\/fr\/transmission-thermique-du-biomattone-comment-interpreter-u-et-rt-pour-chaque-format\/","title":{"rendered":"Transmission thermique du Biomattone\u00ae\u00a0: lire U et Rt par format"},"content":{"rendered":"<p class=\"wp-block-paragraph\">La transmission thermique du Biomattone mesure la quantit\u00e9 de chaleur qui traverse le mur et diminue avec l\u2019\u00e9paisseur\u00a0: de U 0,5 W\/m\u00b2K pour le BA8 \u00e0 U 0,09 W\/m\u00b2K pour le BA50. La r\u00e9sistance thermique Rt, elle, augmente de 1,99 \u00e0 11,53 m\u00b2K\/W.<\/p><h2 class=\"wp-block-heading\">En bref<\/h2><ul class=\"wp-block-list\"><li>Transmission thermique U\u00a0: quantit\u00e9 de chaleur qui passe\u00a0; plus elle est basse, mieux le mur isole.<\/li><li>R\u00e9sistance thermique Rt\u00a0: capacit\u00e9 du mur \u00e0 s\u2019opposer au passage de la chaleur.<\/li><li>Valeurs\u00a0: U de 0,5 \u00e0 0,09 W\/m\u00b2K\u00a0; Rt de 1,99 \u00e0 11,53 m\u00b2K\/W.<\/li><li>Mat\u00e9riau\u00a0: conductivit\u00e9 thermique 0,044 W\/mK.<\/li><li>Source\u00a0: fiche technique Biomattone\u00ae NOV25.<\/li><\/ul><p class=\"wp-block-paragraph\"><em>Mis \u00e0 jour le 5 octobre 2026. Source des donn\u00e9es\u00a0: fiche technique Biomattone\u00ae NOV25.<\/em><\/p><h2 class=\"wp-block-heading\">Dans cet article<\/h2><ul class=\"wp-block-list\"><li><a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"#cos-e\">Que sont la transmission thermique et la r\u00e9sistance thermique<\/a><\/li><li><a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"#formati\">La transmission thermique du Biomattone par format<\/a><\/li><li><a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"#leggere\">Comment lire les valeurs de la fiche<\/a><\/li><li><a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"#progetto\">Transmission thermique et projet<\/a><\/li><li><a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"#territorio\">Transmission thermique du Biomattone \u00e0 Brescia et \u00e0 Bolzano<\/a><\/li><li><a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"#faq\">Questions fr\u00e9quentes sur la transmission thermique<\/a><\/li><\/ul><h2 class=\"wp-block-heading\" id=\"cos-e\">Que sont la transmission thermique et la r\u00e9sistance thermique<\/h2><p class=\"wp-block-paragraph\">U indique la puissance qui traverse chaque m\u00e8tre carr\u00e9 de mur et s\u2019exprime en W\/m\u00b2K. Une valeur basse signifie une meilleure isolation.<\/p><p class=\"wp-block-paragraph\">Rt mesure la capacit\u00e9 du mur \u00e0 s\u2019opposer au passage de la chaleur et s\u2019exprime en m\u00b2K\/W. Les deux valeurs sont li\u00e9es\u00a0: U correspond approximativement \u00e0 l\u2019inverse de Rt.<\/p><h2 class=\"wp-block-heading\" id=\"formati\">La transmission thermique du Biomattone par format<\/h2><p class=\"wp-block-paragraph\">La fiche technique indique U et Rt pour chaque format. Par exemple, le BA30 a un U de 0,14 W\/m\u00b2K et une Rt de 6,99 m\u00b2K\/W.<\/p><figure class=\"wp-block-table\"><table><thead><tr><th>Format<\/th><th>\u00c9paisseur (cm)<\/th><th>U (W\/m\u00b2K)<\/th><th>Rt (m\u00b2K\/W)<\/th><\/tr><\/thead><tbody><tr><td>BA8<\/td><td>8<\/td><td>0,5<\/td><td>1,99<\/td><\/tr><tr><td>BA12<\/td><td>12<\/td><td>0,34<\/td><td>2,9<\/td><\/tr><tr><td>BA20<\/td><td>20<\/td><td>0,21<\/td><td>4,71<\/td><\/tr><tr><td>BA25<\/td><td>25<\/td><td>0,17<\/td><td>5,85<\/td><\/tr><tr><td>BA30<\/td><td>30<\/td><td>0,14<\/td><td>6,99<\/td><\/tr><tr><td>BA36<\/td><td>36<\/td><td>0,12<\/td><td>8,35<\/td><\/tr><tr><td>BA40<\/td><td>40<\/td><td>0,11<\/td><td>9,01<\/td><\/tr><tr><td>BA50<\/td><td>50<\/td><td>0,09<\/td><td>11,53<\/td><\/tr><\/tbody><\/table><\/figure><p class=\"wp-block-paragraph\">La transmission thermique s\u2019am\u00e9liore \u00e0 chaque format sup\u00e9rieur\u00a0: le U du BA50 est plus de cinq fois inf\u00e9rieur \u00e0 celui du BA8.<\/p><h2 class=\"wp-block-heading\" id=\"leggere\">Comment lire les valeurs de la fiche<\/h2><p class=\"wp-block-paragraph\">Pour lire la fiche, partez du U du format, contr\u00f4lez ensuite la Rt et v\u00e9rifiez enfin \u00e0 quelle composition de paroi les valeurs se rapportent.<\/p><ul class=\"wp-block-list\"><li>le format et l\u2019\u00e9paisseur du bloc\u00a0;<\/li><li>l\u2019\u00e9ventuel enduit et les finitions\u00a0;<\/li><li>la source et la date de la donn\u00e9e.<\/li><\/ul><p class=\"wp-block-paragraph\">La transmission thermique ne suffit cependant pas\u00a0: le <a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"https:\/\/biomattone.it\/fr\/dephasage-thermique-du-biomattone-valeurs-par-format\/\">d\u00e9phasage thermique du Biomattone<\/a>, qui mesure le retard de la chaleur, compte aussi.<\/p><h2 class=\"wp-block-heading\" id=\"progetto\">Transmission thermique et projet<\/h2><p class=\"wp-block-paragraph\">Les limites r\u00e9glementaires d\u00e9pendent de la zone climatique et du type d\u2019intervention\u00a0; c\u2019est donc le concepteur qui les v\u00e9rifie. Le bon format d\u00e9pend lui aussi de la composition de paroi compl\u00e8te.<\/p><h2 class=\"wp-block-heading\" id=\"territorio\">Transmission thermique du Biomattone \u00e0 Brescia et \u00e0 Bolzano<\/h2><p class=\"wp-block-paragraph\">Pour Bolzano, consultez les <a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"https:\/\/biomattone.it\/fr\/biomattone-a-bolzano-performances-thermiques-en-climat-rigoureux\/\">performances pour les climats rigoureux<\/a>, avec U 0,09 W\/m\u00b2K pour le BA50. Pour Brescia, voyez plut\u00f4t <a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"https:\/\/biomattone.it\/fr\/biomattone-a-brescia-formats-prix-et-donnees-techniques\/\">formats, prix et donn\u00e9es techniques<\/a>.<\/p><p class=\"wp-block-paragraph\">Les notions de base sur le produit se trouvent dans le guide <a style=\"color:#9e5931;text-decoration:underline;font-weight:600;\" href=\"https:\/\/biomattone.it\/fr\/quest-ce-que-le-biomattone-composition-formats-et-fonctionnement\/\">qu\u2019est-ce que le Biomattone<\/a>.<\/p><h2 class=\"wp-block-heading\" id=\"faq\">Questions fr\u00e9quentes sur la transmission thermique<\/h2>\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1791548916473\"><strong class=\"schema-faq-question\">Qu\u2019est-ce que la transmission thermique\u00a0?<\/strong> <p class=\"schema-faq-answer\">C\u2019est la quantit\u00e9 de chaleur qui traverse un m\u00e8tre carr\u00e9 de mur, en W\/m\u00b2K. Une valeur basse indique une meilleure isolation.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1791548916474\"><strong class=\"schema-faq-question\">Quelle est la transmission thermique du Biomattone\u00a0?<\/strong> <p class=\"schema-faq-answer\">Elle d\u00e9pend du format\u00a0: de 0,5 W\/m\u00b2K pour le BA8 \u00e0 0,09 W\/m\u00b2K pour le BA50. Elle diminue avec l\u2019\u00e9paisseur.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1791548916475\"><strong class=\"schema-faq-question\">Quelle diff\u00e9rence entre U et Rt\u00a0?<\/strong> <p class=\"schema-faq-answer\">La Rt mesure la capacit\u00e9 du mur \u00e0 s\u2019opposer \u00e0 la chaleur, le U en est approximativement l\u2019inverse. Plus la Rt est \u00e9lev\u00e9e, plus le U est bas.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1791548916476\"><strong class=\"schema-faq-question\">Quel format a la transmission thermique la plus basse\u00a0?<\/strong> <p class=\"schema-faq-answer\">Le BA50, avec U 0,09 W\/m\u00b2K et Rt 11,53 m\u00b2K\/W. C\u2019est aussi le format le plus \u00e9pais, avec 50 cm.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1791548916477\"><strong class=\"schema-faq-question\">La transmission thermique suffit-elle pour choisir le format\u00a0?<\/strong> <p class=\"schema-faq-answer\">Non. Le d\u00e9phasage thermique compte aussi, tout comme l\u2019espace, la composition de paroi et la zone climatique. Il faut \u00e9valuer le projet dans son ensemble.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Transmission thermique du Biomattone\u00ae\u00a0: U de 0,5 \u00e0 0,09 W\/m\u00b2K et Rt de 1,99 \u00e0 11,53 m\u00b2K\/W. Tableau par format et guide de lecture.<\/p>\n","protected":false},"author":2,"featured_media":2457,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[52],"tags":[49,48],"class_list":["post-2632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-prestazioni-e-dati-tecnici","tag-bolzano","tag-brescia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Transmission thermique du Biomattone\u00a0: lire U et Rt par format<\/title>\n<meta name=\"description\" content=\"Transmission thermique du Biomattone de 0,5 \u00e0 0,09 W\/m\u00b2K\u00a0: tableau U et Rt par format, du BA8 au BA50, et lecture des valeurs de la fiche.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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Une valeur basse indique une meilleure isolation.\",\"inLanguage\":\"fr-FR\"},\"inLanguage\":\"fr-FR\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/biomattone.it\\\/fr\\\/transmission-thermique-du-biomattone-comment-interpreter-u-et-rt-pour-chaque-format\\\/#faq-question-1791548916474\",\"position\":2,\"url\":\"https:\\\/\\\/biomattone.it\\\/fr\\\/transmission-thermique-du-biomattone-comment-interpreter-u-et-rt-pour-chaque-format\\\/#faq-question-1791548916474\",\"name\":\"Quelle est la transmission thermique du Biomattone\u00a0?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Elle d\u00e9pend du format\u00a0: de 0,5 W\\\/m\u00b2K pour le BA8 \u00e0 0,09 W\\\/m\u00b2K pour le BA50. 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