{"id":312,"date":"2021-02-15T12:11:42","date_gmt":"2021-02-15T12:11:42","guid":{"rendered":"https:\/\/www.inspec-pro.ca\/?p=312"},"modified":"2026-08-10T13:50:25","modified_gmt":"2026-08-10T17:50:25","slug":"the-difference-between-air-barriers-and-vapour-barriers","status":"publish","type":"post","link":"https:\/\/www.inspec-pro.ca\/fr\/the-difference-between-air-barriers-and-vapour-barriers\/","title":{"rendered":"Pare-air et pare-vapeur : ce que les propri\u00e9taires doivent savoir"},"content":{"rendered":"<p>Les pare-air et pare-vapeur sont des \u00e9l\u00e9ments importants de l\u2019enveloppe d\u2019une maison, mais ils remplissent des fonctions diff\u00e9rentes. Comprendre la diff\u00e9rence peut aider les propri\u00e9taires \u00e0 reconna\u00eetre pourquoi les ouvertures, les mat\u00e9riaux endommag\u00e9s et les r\u00e9novations mal ex\u00e9cut\u00e9es peuvent contribuer aux courants d\u2019air, \u00e0 la condensation et aux dommages caus\u00e9s par l\u2019humidit\u00e9.<\/p>\n<p>Un pare-air contr\u00f4le le mouvement de l\u2019air \u00e0 travers les murs, plafonds et autres parties de l\u2019enveloppe du b\u00e2timent. Un pare-vapeur, aussi appel\u00e9 retardateur de vapeur, limite le mouvement de la vapeur d\u2019eau \u00e0 travers les mat\u00e9riaux de construction.<\/p>\n<h2>Qu\u2019est-ce qu\u2019un pare-air?<\/h2>\n<p>Un pare-air est un syst\u00e8me continu con\u00e7u pour r\u00e9duire les fuites d\u2019air incontr\u00f4l\u00e9es \u00e0 travers l\u2019enveloppe du b\u00e2timent.<\/p>\n<p>Les fuites d\u2019air peuvent transporter de la chaleur et de l\u2019humidit\u00e9 \u00e0 travers des ouvertures autour de :<\/p>\n<ul>\n<li>Fen\u00eatres et portes ext\u00e9rieures.<\/li>\n<li>Bo\u00eetes \u00e9lectriques et luminaires.<\/li>\n<li>P\u00e9n\u00e9trations de plomberie et de c\u00e2blage.<\/li>\n<li>Trappes d\u2019acc\u00e8s \u00e0 l\u2019entretoit.<\/li>\n<li>Jonctions mur-plancher et mur-plafond.<\/li>\n<li>Conduits m\u00e9caniques et \u00e9vents d\u2019\u00e9vacuation.<\/li>\n<\/ul>\n<p>Un pare-air efficace doit \u00eatre continu et correctement scell\u00e9 aux joints, transitions et p\u00e9n\u00e9trations. Les mat\u00e9riaux pouvant faire partie d\u2019un syst\u00e8me pare-air comprennent les membranes pare-intemp\u00e9ries, les panneaux de rev\u00eatement ext\u00e9rieur, les cloisons s\u00e8ches, le poly\u00e9thyl\u00e8ne et d\u2019autres mat\u00e9riaux \u00e9tanches \u00e0 l\u2019air lorsque leurs joints et raccords sont correctement scell\u00e9s.<\/p>\n<h2>Qu\u2019est-ce qu\u2019un pare-vapeur?<\/h2>\n<p>Un pare-vapeur limite la diffusion de vapeur d\u2019eau \u00e0 travers les murs, plafonds et assemblages isol\u00e9s.<\/p>\n<p>Dans les climats froids canadiens, le pare-vapeur se trouve g\u00e9n\u00e9ralement du c\u00f4t\u00e9 int\u00e9rieur chaud de l\u2019isolation ou pr\u00e8s de celui-ci. Son r\u00f4le est de r\u00e9duire la quantit\u00e9 d\u2019humidit\u00e9 int\u00e9rieure pouvant migrer vers les parties plus froides du mur ou du plafond et s\u2019y condenser.<\/p>\n<p>Les mat\u00e9riaux courants de contr\u00f4le de la vapeur comprennent :<\/p>\n<ul>\n<li>Pellicule de poly\u00e9thyl\u00e8ne.<\/li>\n<li>Membranes intelligentes retardatrices de vapeur.<\/li>\n<li>Mat\u00e9riaux rev\u00eatus d\u2019une feuille m\u00e9tallique.<\/li>\n<li>Peintures pare-vapeur approuv\u00e9es.<\/li>\n<li>Certains types d\u2019isolants rigides et de panneaux de rev\u00eatement.<\/li>\n<\/ul>\n<p>Le mat\u00e9riau et l\u2019emplacement appropri\u00e9s d\u00e9pendent de l\u2019assemblage mural, du climat, de la configuration de l\u2019isolation et de la capacit\u00e9 pr\u00e9vue de s\u00e9chage.<\/p>\n<h2>Les fuites d\u2019air et la diffusion de vapeur sont diff\u00e9rentes<\/h2>\n<p>Une fuite d\u2019air se produit lorsque de l\u2019air traverse des ouvertures dans l\u2019enveloppe du b\u00e2timent. La diffusion de vapeur se produit lorsque la vapeur d\u2019eau traverse un mat\u00e9riau en raison de diff\u00e9rences de pression de vapeur.<\/p>\n<p>Une petite ouverture peut permettre \u00e0 une quantit\u00e9 importante d\u2019air chaud charg\u00e9 d\u2019humidit\u00e9 d\u2019entrer dans un mur ou un entretoit froid. Lorsque cet air refroidit, l\u2019humidit\u00e9 peut se condenser sur des mat\u00e9riaux plus froids.<\/p>\n<p>Pour cette raison, le maintien d\u2019un pare-air continu est un \u00e9l\u00e9ment important du contr\u00f4le des pertes de chaleur et du d\u00e9placement de l\u2019humidit\u00e9.<\/p>\n<h2>Un m\u00eame mat\u00e9riau peut-il remplir les deux fonctions?<\/h2>\n<p>Oui. Certains mat\u00e9riaux peuvent agir \u00e0 la fois comme pare-air et pare-vapeur lorsqu\u2019ils r\u00e9pondent aux caract\u00e9ristiques de performance requises et sont install\u00e9s de fa\u00e7on continue.<\/p>\n<p>La pellicule de poly\u00e9thyl\u00e8ne en est un exemple courant. Elle peut limiter la diffusion de vapeur et contr\u00f4ler le mouvement de l\u2019air lorsque tous les joints, bords, p\u00e9n\u00e9trations et raccords sont correctement scell\u00e9s.<\/p>\n<p>Toutefois, la simple installation de poly\u00e9thyl\u00e8ne ne cr\u00e9e pas automatiquement un syst\u00e8me pare-air efficace. Les joints ouverts, les zones endommag\u00e9es et les p\u00e9n\u00e9trations \u00e9lectriques ou de plomberie non scell\u00e9es peuvent permettre des fuites d\u2019air.<\/p>\n<h2>Qu\u2019est-ce qu\u2019une barri\u00e8re contre les intemp\u00e9ries?<\/h2>\n<p>Une barri\u00e8re contre les intemp\u00e9ries, ou membrane r\u00e9sistante \u00e0 l\u2019eau, est g\u00e9n\u00e9ralement install\u00e9e derri\u00e8re le rev\u00eatement ext\u00e9rieur. Elle aide \u00e0 g\u00e9rer l\u2019eau de pluie qui passe derri\u00e8re le parement, le placage de brique ou d\u2019autres finis ext\u00e9rieurs.<\/p>\n<p>L\u2019assemblage mural ext\u00e9rieur devrait offrir une voie de drainage permettant \u00e0 l\u2019eau incidente de s\u2019\u00e9couler vers le bas et de sortir de fa\u00e7on s\u00e9curitaire. Selon sa conception et son installation, le panneau de rev\u00eatement ext\u00e9rieur ou la membrane pare-intemp\u00e9ries peut aussi faire partie du syst\u00e8me pare-air.<\/p>\n<h2>Probl\u00e8mes courants li\u00e9s aux pare-air et pare-vapeur<\/h2>\n<p>Les conditions couramment observ\u00e9es lors d\u2019inspections r\u00e9sidentielles comprennent :<\/p>\n<ul>\n<li>Pellicule de poly\u00e9thyl\u00e8ne d\u00e9chir\u00e9e ou manquante.<\/li>\n<li>Joints et chevauchements non scell\u00e9s.<\/li>\n<li>Ouvertures autour des bo\u00eetes \u00e9lectriques.<\/li>\n<li>Espaces autour des p\u00e9n\u00e9trations de plomberie et de c\u00e2blage.<\/li>\n<li>Trappes d\u2019entretoit mal scell\u00e9es.<\/li>\n<li>Discontinuit\u00e9s \u00e0 la jonction entre un agrandissement et le b\u00e2timent d\u2019origine.<\/li>\n<li>\u00c9tanch\u00e9it\u00e9 \u00e0 l\u2019air manquante autour des fen\u00eatres et des portes.<\/li>\n<li>Conduits d\u2019extraction de salle de bains ou de cuisine se terminant dans l\u2019entretoit.<\/li>\n<li>Isolation install\u00e9e sans contr\u00f4le ad\u00e9quat de l\u2019air ou de la vapeur.<\/li>\n<li>Plusieurs couches \u00e0 faible perm\u00e9ance qui limitent le s\u00e9chage.<\/li>\n<\/ul>\n<h2>Pourquoi la condensation se forme-t-elle?<\/h2>\n<p>L\u2019air int\u00e9rieur chaud peut contenir une quantit\u00e9 importante d\u2019humidit\u00e9 provenant de la cuisson, des bains, de la lessive, des occupants et des humidificateurs. Si cet air atteint une surface froide dans un mur, un plafond ou un entretoit, l\u2019humidit\u00e9 peut se condenser.<\/p>\n<p>La condensation r\u00e9p\u00e9t\u00e9e peut contribuer \u00e0 :<\/p>\n<ul>\n<li>Isolation mouill\u00e9e ou comprim\u00e9e.<\/li>\n<li>D\u00e9t\u00e9rioration du bois.<\/li>\n<li>Corrosion des attaches m\u00e9talliques.<\/li>\n<li>Taches sur les plafonds ou les murs.<\/li>\n<li>Croissance ressemblant \u00e0 de la moisissure.<\/li>\n<li>R\u00e9duction de la performance de l\u2019isolation.<\/li>\n<\/ul>\n<p>L\u2019humidit\u00e9 int\u00e9rieure, la ventilation, le niveau d\u2019isolation, les temp\u00e9ratures ext\u00e9rieures et les fuites d\u2019air peuvent tous influencer la condensation.<\/p>\n<h2>Les r\u00e9novations n\u00e9cessitent une planification attentive<\/h2>\n<p>Ajouter de l\u2019isolation ou finir un sous-sol peut modifier la fa\u00e7on dont un mur existant g\u00e8re la chaleur et l\u2019humidit\u00e9. Installer des mat\u00e9riaux imperm\u00e9ables au mauvais endroit peut emprisonner l\u2019humidit\u00e9 entre les couches et r\u00e9duire la capacit\u00e9 de s\u00e9chage de l\u2019assemblage.<\/p>\n<p>Avant de modifier un mur ext\u00e9rieur, un mur de sous-sol ou un assemblage d\u2019entretoit, l\u2019ensemble de la construction devrait \u00eatre pris en compte. Les assemblages complexes ou inhabituels devraient \u00eatre examin\u00e9s par un professionnel qualifi\u00e9 de l\u2019enveloppe du b\u00e2timent.<\/p>\n<h2>Que peut rep\u00e9rer une inspection r\u00e9sidentielle?<\/h2>\n<p>Une inspection r\u00e9sidentielle peut rep\u00e9rer des pr\u00e9occupations visibles et accessibles li\u00e9es \u00e0 l\u2019isolation, aux fuites d\u2019air, aux mat\u00e9riaux de contr\u00f4le de la vapeur, \u00e0 la ventilation de l\u2019entretoit, \u00e0 la condensation et aux taches d\u2019humidit\u00e9.<\/p>\n<p>L\u2019inspection est visuelle et non invasive. Elle ne peut pas confirmer les mat\u00e9riaux dissimul\u00e9s ni la continuit\u00e9 des barri\u00e8res situ\u00e9es derri\u00e8re les murs et plafonds finis.<\/p>\n<p>Lorsque de l\u2019humidit\u00e9 importante, de la condensation ou des r\u00e9novations douteuses sont observ\u00e9es, une investigation plus approfondie par un entrepreneur qualifi\u00e9 ou un sp\u00e9cialiste de l\u2019enveloppe du b\u00e2timent peut \u00eatre recommand\u00e9e.<\/p>\n<h2>En savoir plus sur le contr\u00f4le de l\u2019air et de l\u2019humidit\u00e9<\/h2>\n<p>Ressources naturelles Canada fournit des renseignements suppl\u00e9mentaires sur les fuites d\u2019air, le contr\u00f4le de la vapeur et l\u2019isolation dans son <a href=\"https:\/\/natural-resources.canada.ca\/energy-efficiency\/home-energy-efficiency\/keeping-heat-section-2-your-house-works\" target=\"_blank\" rel=\"noopener\">guide du propri\u00e9taire Emprisonnons la chaleur<\/a>.<\/p>\n<h2>Prot\u00e9gez l\u2019enveloppe de votre maison<\/h2>\n<p>Inspec-Pro Inspection r\u00e9sidentielle offre des inspections r\u00e9sidentielles professionnelles partout \u00e0 Ottawa, Gatineau, en Outaouais et dans les communaut\u00e9s environnantes.<\/p>\n<p>Appelez <a href=\"tel:+18199625880\">819-962-5880<\/a>, par courriel \u00e0 <a href=\"mailto:info@inspec-pro.ca\">info@inspec-pro.ca<\/a>, ou <a href=\"https:\/\/www.inspec-pro.ca\/fr\/contact-us\/?scroll=form\"><strong>obtenir une soumission d\u2019inspection pour votre propri\u00e9t\u00e9<\/strong><\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Air barriers and vapour barriers are important parts of a home\u2019s building envelope, but they perform different jobs. Understanding the difference can help homeowners recognize why gaps, damaged materials and poorly completed renovations may contribute to drafts, condensation and moisture damage. An air barrier controls the movement of air through walls, ceilings and other parts [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":314,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_glsr_average":0,"_glsr_ranking":0,"_glsr_reviews":0,"footnotes":""},"categories":[31],"tags":[56,58,59,57],"class_list":["post-312","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-home-inspection-tips","tag-air-barrier","tag-building-envelope","tag-moisture-control","tag-vapour-barrier"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Air Barrier vs Vapour Barrier | Homeowner Guide<\/title>\n<meta name=\"description\" content=\"Learn the difference between air barriers and vapour barriers and how they help control drafts, condensation and moisture in Canadian 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