{"id":4897,"date":"2026-02-04T12:09:45","date_gmt":"2026-02-04T11:09:45","guid":{"rendered":"https:\/\/avant4degres.fr\/?page_id=4897"},"modified":"2026-08-14T13:39:53","modified_gmt":"2026-08-14T11:39:53","slug":"faut-il-isoler-une-zone-contrainte-en-epaisseur","status":"publish","type":"page","link":"https:\/\/avant4degres.fr\/en\/faut-il-isoler-une-zone-contrainte-en-epaisseur\/","title":{"rendered":"Faut-il isoler une zone contrainte en \u00e9paisseur ?"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"4897\" class=\"elementor elementor-4897\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8cd1e60 e-flex e-con-boxed e-con e-parent\" data-id=\"8cd1e60\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-951714b elementor-widget elementor-widget-heading\" data-id=\"951714b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Faut-il isoler\n(m\u00eame un peu)\nune zone contrainte\nen \u00e9paisseur ?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3bdff10 e-flex e-con-boxed e-con e-parent\" data-id=\"3bdff10\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ee0f0cd elementor-widget elementor-widget-text-editor\" data-id=\"ee0f0cd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><em>4 f\u00e9vrier 2026<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-16c20ec elementor-arrows-position-inside elementor-pagination-position-outside elementor-widget elementor-widget-image-carousel\" data-id=\"16c20ec\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;navigation&quot;:&quot;both&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;pause_on_hover&quot;:&quot;yes&quot;,&quot;pause_on_interaction&quot;:&quot;yes&quot;,&quot;autoplay_speed&quot;:5000,&quot;infinite&quot;:&quot;yes&quot;,&quot;speed&quot;:500}\" data-widget_type=\"image-carousel.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-image-carousel-wrapper swiper\" role=\"region\" aria-roledescription=\"carousel\" aria-label=\"Carrousel d\u2019images\" dir=\"ltr\">\n\t\t\t<div class=\"elementor-image-carousel swiper-wrapper\" aria-live=\"off\">\n\t\t\t\t\t\t\t\t<div class=\"swiper-slide\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"1 of 3\" data-no-translation-aria-label=\"\"><figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/avant4degres.fr\/wp-content\/uploads\/elementor\/thumbs\/Pont-thermique-francais-2-rinnfe8obtuktflid0q04nhj998sj56mzdbsvzo61s.png\" alt=\"Pont thermique fran\u00e7ais (Oliva &amp; Courgey 2010)\" \/><\/figure><\/div><div class=\"swiper-slide\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"2 of 3\" data-no-translation-aria-label=\"\"><figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/avant4degres.fr\/wp-content\/uploads\/elementor\/thumbs\/Resistance-thermique-rinn7816wontvhgv2zjry7q9bniwlvqnix4todse5c.png\" alt=\"R\u00e9sistance thermique R\" \/><\/figure><\/div><div class=\"swiper-slide\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"3 of 3\" data-no-translation-aria-label=\"\"><figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/avant4degres.fr\/wp-content\/uploads\/elementor\/thumbs\/Coefficient-de-transmission-surfacique-rinn7cqduuu9hja1bjkwsojkakvqod9b7ke92rlfa8.png\" alt=\"Coefficient de transmission surfacique U\" \/><\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-swiper-button elementor-swiper-button-prev\" role=\"button\" tabindex=\"0\">\n\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-chevron-left\" viewbox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M646 125C629 125 613 133 604 142L308 442C296 454 292 471 292 487 292 504 296 521 308 533L604 854C617 867 629 875 646 875 663 875 679 871 692 858 704 846 713 829 713 812 713 796 708 779 692 767L438 487 692 225C700 217 708 204 708 187 708 171 704 154 692 142 675 129 663 125 646 125Z\"><\/path><\/svg>\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"elementor-swiper-button elementor-swiper-button-next\" role=\"button\" tabindex=\"0\">\n\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-chevron-right\" viewbox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M696 533C708 521 713 504 713 487 713 471 708 454 696 446L400 146C388 133 375 125 354 125 338 125 325 129 313 142 300 154 292 171 292 187 292 204 296 221 308 233L563 492 304 771C292 783 288 800 288 817 288 833 296 850 308 863 321 871 338 875 354 875 371 875 388 867 400 854L696 533Z\"><\/path><\/svg>\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"swiper-pagination\"><\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5fcd225 e-flex e-con-boxed e-con e-parent\" data-id=\"5fcd225\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3723539 elementor-widget elementor-widget-text-editor\" data-id=\"3723539\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>C\u2019est une question assez fr\u00e9quente en r\u00e9novation : <strong>est-il pertinent d\u2019isoler seulement un peu une zone contrainte en \u00e9paisseur (les tableaux de menuiseries, derri\u00e8re des tuyaux) qui constituera un pont thermique dans une isolation se voulant performante ?<\/strong> Vaut-il mieux ne rien faire ?<\/p><p>Pour commencer, qu\u2019est-ce qu\u2019un pont thermique ? Un pont thermique est une <strong>faiblesse dans l\u2019isolation d\u2019un b\u00e2timent<\/strong>, une zone o\u00f9 la r\u00e9sistance thermique est affaiblie, provoquant des d\u00e9perditions de chaleur l\u2019hiver et des surchauffes l\u2019\u00e9t\u00e9. Il existe plusieurs cat\u00e9gories de ponts thermiques : <strong>de liaison<\/strong> (lin\u00e9aires comme une liaison mur\/dalle ou ponctuels comme un poteau), <strong>structurels<\/strong> (rails, vis) ou <strong>parasites<\/strong> (passage de r\u00e9seaux, tassement de l\u2019isolant), le plus parlant \u00e0 mon sens \u00e9tant le \u00ab pont thermique fran\u00e7ais \u00bb d\u00e9crit par Oliva &amp; Courgey 2010 (figure 1).<\/p><p>Il existe de nombreuses grandeurs physiques li\u00e9es au flux de chaleur qui m\u00e9riteraient d&rsquo;\u00eatre d\u00e9velopp\u00e9es, mais je vais m\u2019arr\u00eater ici sur la bien connue <strong>r\u00e9sistance thermique R<\/strong> et son inverse moins connu du grand public le <strong>coefficient de transmission surfacique U<\/strong>.<\/p><p>La r\u00e9sistance thermique R, exprim\u00e9e en m\u00b2.K\/W, correspond \u00e0 la r\u00e9sistance que rencontre le flux de chaleur traversant une paroi. Sa formule est \u00e9paisseur e\/coefficient de conductivit\u00e9 thermique \u028e. <strong>Plus l&rsquo;\u00e9paisseur d&rsquo;un mat\u00e9riau est grande, plus le flux de chaleur qui le traverse rencontre de r\u00e9sistance.<\/strong> On retrouve le R et le \u028e sur les fiches techniques des isolants : <strong>plus le R d\u2019un mat\u00e9riau est grand, plus ce mat\u00e9riau sera isolant<\/strong>, comme l\u2019illustre la figure 2 qui repr\u00e9sente la r\u00e9sistance thermique d\u2019un isolant dont le \u028e = 0,036 W\/m.K.<\/p><p>Le coefficient de transmission surfacique U, exprim\u00e9 en W\/m\u00b2.K, correspond \u00e0 la <strong>conductance<\/strong> de la paroi. En d\u2019autres termes, U repr\u00e9sente <strong>l\u2019intensit\u00e9 du flux de chaleur qui traverse 1 m\u00b2 de paroi pour une diff\u00e9rence de temp\u00e9rature de 1\u00b0K entre les deux ambiances qui s\u00e9parent cette paroi<\/strong>. Sa formule est 1\/R (l\u2019inverse de la r\u00e9sistance thermique). Et c\u2019est l\u00e0 que l\u2019on se rend compte que <strong>les premiers centim\u00e8tres d\u2019isolant sont les plus efficaces<\/strong> (figure 3). Dans cet exemple, j\u2019ai simul\u00e9 un mur en pierre calcaire de 40 cm d\u2019\u00e9paisseur, pour lequel R \u2248 0,2 m\u00b2.K\/W et U \u2248 6 W\/m\u00b2.K. D\u00e8s que j\u2019ajoute 1 cm d&rsquo;isolant \u028e = 0,036 W\/m.K., U tombe \u00e0 \u2248 2,25 W\/m\u00b2.K !<\/p><p>En conclusion, <strong>m\u00eame si vous ne pouvez mettre que 3 cm sur vos tableaux de fen\u00eatres, mettez-les<\/strong> ! Il est \u00e9galement possible d\u2019utiliser un isolant au \u028e plus faible qui permettra de limiter l\u2019\u00e9paisseur et les ponts thermiques. <strong>Cela ne veut pas dire qu&rsquo;il faut se contenter de 3 cm partout<\/strong> : plus l&rsquo;on montera en \u00e9paisseur d&rsquo;isolant, plus le flux thermique sera diminu\u00e9 (sous r\u00e9serve d&rsquo;une mise en \u0153uvre bien r\u00e9alis\u00e9e, mais c&rsquo;est une autre histoire).<\/p><p>\ud83d\udcd6 Oliva J.-P., Courgey S. (2010, 2023) &#8211; <em>L\u2019isolation thermique \u00e9cologique<\/em>, \u00c9ditions Terre Vivante, 256 p.<\/p><p>\ud83c\udfa5 <a href=\"https:\/\/www.youtube.com\/watch?v=Xbcq19Y5W5M\" target=\"_blank\" rel=\"noopener\"><span style=\"text-decoration: underline;\">Webinaire du 06\/01\/2026 sur l&rsquo;isolation organis\u00e9 par Kenzai et anim\u00e9 par Julien Vye<\/span><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6484fb1 elementor-align-center elementor-mobile-align-right elementor-widget__width-initial elementor-widget elementor-widget-button\" data-id=\"6484fb1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/avant4degres.fr\/en\/mes-offres-daccompagnement-dans-votre-parcours-de-renovation\/\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">J'ai des questions sur l'isolation de mon b\u00e2timent<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Faut-il isoler (m\u00eame un peu) une zone contrainte en \u00e9paisseur ? 4 f\u00e9vrier 2026 C\u2019est une question assez fr\u00e9quente en r\u00e9novation : est-il pertinent d\u2019isoler seulement un peu une zone contrainte en \u00e9paisseur (les tableaux de menuiseries, derri\u00e8re des tuyaux) qui constituera un pont thermique dans une isolation se voulant performante ? Vaut-il mieux ne [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ocean_front_end_style_editor":"no","ocean_post_layout":"full-width","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"off","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"on","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"off","ocean_custom_footer_template":"","footnotes":""},"class_list":["post-4897","page","type-page","status-publish","hentry","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Faut-il isoler une zone contrainte en \u00e9paisseur ? - Avant 4 degr\u00e9s<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/avant4degres.fr\/en\/faut-il-isoler-une-zone-contrainte-en-epaisseur\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Faut-il isoler une zone contrainte en \u00e9paisseur ? - Avant 4 degr\u00e9s\" \/>\n<meta property=\"og:description\" content=\"Faut-il isoler (m\u00eame un peu) une zone contrainte en \u00e9paisseur ? 4 f\u00e9vrier 2026 C\u2019est une question assez fr\u00e9quente en r\u00e9novation : est-il pertinent d\u2019isoler seulement un peu une zone contrainte en \u00e9paisseur (les tableaux de menuiseries, derri\u00e8re des tuyaux) qui constituera un pont thermique dans une isolation se voulant performante ? 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