{"id":6581,"date":"2025-08-08T08:05:29","date_gmt":"2025-08-08T06:05:29","guid":{"rendered":"https:\/\/www.la-maison-naturelle.com\/blog\/?p=6581"},"modified":"2025-08-13T09:01:26","modified_gmt":"2025-08-13T07:01:26","slug":"iti-sur-mur-en-pierre-composition-type-validee-et-bonnes-pratiques","status":"publish","type":"post","link":"https:\/\/www.la-maison-naturelle.com\/blog\/iti-sur-mur-en-pierre-composition-type-validee-et-bonnes-pratiques\/","title":{"rendered":"ITI sur mur en pierre : composition type valid\u00e9e et bonnes pratiques"},"content":{"rendered":"<p data-start=\"271\" data-end=\"671\"><strong data-start=\"271\" data-end=\"284\">Objectif.<\/strong> Mettre en \u0153uvre une isolation thermique par l\u2019int\u00e9rieur (ITI) sur un mur en pierre massif en garantissant performance et durabilit\u00e9, sur la base d\u2019une validation hygrothermique multi\u2011annuelle et de conditions de mise en \u0153uvre pr\u00e9cises. Le mur support doit \u00eatre sain et exempt de remont\u00e9es capillaires, faute de quoi la solution n\u2019est pas recevable. <button class=\"ms-1 flex h-[22px] items-center rounded-xl px-2 relative bottom-[-2px] bg-[#f4f4f4] text-token-text-secondary! hover:bg-token-bg-secondary dark:bg-token-main-surface-secondary dark:hover:bg-token-bg-secondary\"><\/button><\/p>\n<h2 data-start=\"673\" data-end=\"736\">Pourquoi une membrane hygrovariable et de la fibre de bois ?<\/h2>\n<p data-start=\"737\" data-end=\"1286\">Sur un mur en pierre, l\u2019ITI impose d\u2019arbitrer entre <strong data-start=\"789\" data-end=\"808\">confort d\u2019hiver<\/strong>, <strong data-start=\"810\" data-end=\"831\">risque d\u2019humidit\u00e9<\/strong> et <strong data-start=\"835\" data-end=\"866\">capacit\u00e9 de s\u00e9chage estival<\/strong>. Une <strong data-start=\"872\" data-end=\"898\">membrane <a href=\"https:\/\/www.la-maison-naturelle.com\/blog\/un-pare-vapeur-hygrovariable\/\" data-internallinksmanager029f6b8e52c=\"120\" title=\"Qu'est-ce qu'un pare vapeur hygrovariable ?\">hygrovariable<\/a><\/strong> fonctionne en <strong data-start=\"913\" data-end=\"922\">frein<\/strong> l\u2019hiver (<strong data-start=\"932\" data-end=\"945\"><a href=\"https:\/\/www.la-maison-naturelle.com\/blog\/cest-quoi-la-valeur-sd-dun-pare-vapeur\/\" data-internallinksmanager029f6b8e52c=\"76\" title=\"valeur SD\">Sd<\/a> &gt; 25 m<\/strong>) et <strong data-start=\"950\" data-end=\"961\">s\u2019ouvre<\/strong> l\u2019\u00e9t\u00e9 (<strong data-start=\"969\" data-end=\"981\">\u2248 0,25 m<\/strong>) pour permettre la <strong data-start=\"1001\" data-end=\"1016\">rediffusion<\/strong> d\u2019une humidit\u00e9 \u00e9ventuellement pi\u00e9g\u00e9e. Associ\u00e9e \u00e0 <strong data-start=\"1066\" data-end=\"1076\">160 mm<\/strong> de <strong data-start=\"1080\" data-end=\"1097\">fibre de bois<\/strong> (<strong data-start=\"1099\" data-end=\"1118\">R = 4,57 m\u00b2\u00b7K\/W<\/strong>), on obtient un syst\u00e8me performant <strong data-start=\"1154\" data-end=\"1169\">\u00e0 condition<\/strong> de respecter l\u2019<a href=\"https:\/\/www.la-maison-naturelle.com\/3042-etancheite-a-l-air\" data-internallinksmanager029f6b8e52c=\"138\" title=\"\u00e9tanch\u00e9it\u00e9 \u00e0 l\u2019air\">\u00e9tanch\u00e9it\u00e9 \u00e0 l\u2019air<\/a> et les r\u00e8gles d\u2019ex\u00e9cution d\u00e9crites plus bas. <button class=\"ms-1 flex h-[22px] items-center rounded-xl px-2 relative bottom-[-2px] bg-[#f4f4f4] text-token-text-secondary! hover:bg-token-bg-secondary dark:bg-token-main-surface-secondary dark:hover:bg-token-bg-secondary\"><\/button><\/p>\n<h2 data-start=\"1288\" data-end=\"1331\">Composition type (int\u00e9rieur \u2192 ext\u00e9rieur)<\/h2>\n<ul data-start=\"1332\" data-end=\"1692\">\n<li data-start=\"1332\" data-end=\"1370\">\n<p data-start=\"1334\" data-end=\"1370\">Parement <strong data-start=\"1343\" data-end=\"1368\">ouvert \u00e0 la diffusion<\/strong><\/p>\n<\/li>\n<li data-start=\"1371\" data-end=\"1418\">\n<p data-start=\"1373\" data-end=\"1418\"><strong data-start=\"1373\" data-end=\"1391\">Vide technique<\/strong> (<strong data-start=\"1393\" data-end=\"1404\">\u2265 22 mm<\/strong> recommand\u00e9)<\/p>\n<\/li>\n<li data-start=\"1419\" data-end=\"1485\">\n<p data-start=\"1421\" data-end=\"1485\"><strong data-start=\"1421\" data-end=\"1483\">Membrane d\u2019\u00e9tanch\u00e9it\u00e9 \u00e0 l\u2019air \/ frein\u2011vapeur hygrovariable<\/strong><\/p>\n<\/li>\n<li data-start=\"1486\" data-end=\"1523\">\n<p data-start=\"1488\" data-end=\"1523\"><strong data-start=\"1488\" data-end=\"1521\">Fibre de bois 160 mm (R 4,57)<\/strong><\/p>\n<\/li>\n<li data-start=\"1524\" data-end=\"1545\">\n<p data-start=\"1526\" data-end=\"1545\"><strong data-start=\"1526\" data-end=\"1543\">Mortier 15 mm<\/strong><\/p>\n<\/li>\n<li data-start=\"1546\" data-end=\"1692\">\n<p data-start=\"1548\" data-end=\"1692\"><strong data-start=\"1548\" data-end=\"1565\">Pierre 400 mm<\/strong><br data-start=\"1565\" data-end=\"1568\" \/>Cette composition a fait l\u2019objet d\u2019une <strong data-start=\"1607\" data-end=\"1621\">validation<\/strong> dans le cadre d\u00e9crit ci\u2011dessous. <button class=\"ms-1 flex h-[22px] items-center rounded-xl px-2 relative bottom-[-2px] bg-[#f4f4f4] text-token-text-secondary! hover:bg-token-bg-secondary dark:bg-token-main-surface-secondary dark:hover:bg-token-bg-secondary\"><\/button><\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"1694\" data-end=\"1745\">Hypoth\u00e8ses de validation (exemple de simulation)<\/h2>\n<ul data-start=\"1746\" data-end=\"2340\">\n<li data-start=\"1746\" data-end=\"1820\">\n<p data-start=\"1748\" data-end=\"1820\"><strong data-start=\"1748\" data-end=\"1767\">Site climatique<\/strong> : zone de montagne du <strong data-start=\"1790\" data-end=\"1796\">06<\/strong>, <strong data-start=\"1798\" data-end=\"1818\">orientation Nord<\/strong><\/p>\n<\/li>\n<li data-start=\"1821\" data-end=\"1865\">\n<p data-start=\"1823\" data-end=\"1865\"><strong data-start=\"1823\" data-end=\"1834\">P\u00e9riode<\/strong> : <strong data-start=\"1837\" data-end=\"1847\">10 ans<\/strong> (<strong data-start=\"1849\" data-end=\"1862\">2025\u20132035<\/strong>)<\/p>\n<\/li>\n<li data-start=\"1866\" data-end=\"1923\">\n<p data-start=\"1868\" data-end=\"1923\"><strong data-start=\"1868\" data-end=\"1892\">Conditions initiales<\/strong> : <strong data-start=\"1895\" data-end=\"1906\">HR 80 %<\/strong>, <strong data-start=\"1908\" data-end=\"1921\">T = 20\u202f\u00b0C<\/strong><\/p>\n<\/li>\n<li data-start=\"1924\" data-end=\"2029\">\n<p data-start=\"1926\" data-end=\"2029\"><strong data-start=\"1926\" data-end=\"1942\">Exfiltration<\/strong> (d\u00e9fauts mineurs) : <strong data-start=\"1963\" data-end=\"1986\">q50 = 2,5 m\u00b3\/(m\u00b2\u00b7h)<\/strong> affectant les <strong data-start=\"2001\" data-end=\"2009\">5 mm<\/strong> int\u00e9rieurs du mur<\/p>\n<\/li>\n<li data-start=\"2030\" data-end=\"2081\">\n<p data-start=\"2032\" data-end=\"2081\"><strong data-start=\"2032\" data-end=\"2056\">Absorptivit\u00e9 solaire<\/strong> : <strong data-start=\"2059\" data-end=\"2066\">0,6<\/strong> (gris moyen)<\/p>\n<\/li>\n<li data-start=\"2082\" data-end=\"2340\">\n<p data-start=\"2084\" data-end=\"2340\"><strong data-start=\"2084\" data-end=\"2102\">Base mat\u00e9riaux<\/strong> : enduit ciment (A = 0,51 kg\/(m\u00b2\u00b7h^0,5)) ; pierre tendre g\u00e9n\u00e9rique (<strong data-start=\"2171\" data-end=\"2189\">\u03c1 = 1920 kg\/m\u00b3<\/strong>)<br data-start=\"2190\" data-end=\"2193\" \/><strong data-start=\"2193\" data-end=\"2218\">Conclusion de l\u2019\u00e9tude<\/strong> : <strong data-start=\"2221\" data-end=\"2240\">complexe valide<\/strong> selon les <strong data-start=\"2251\" data-end=\"2281\">crit\u00e8res du guide SimHuBat<\/strong> dans ces conditions. <button class=\"ms-1 flex h-[22px] items-center rounded-xl px-2 relative bottom-[-2px] bg-[#f4f4f4] text-token-text-secondary! hover:bg-token-bg-secondary dark:bg-token-main-surface-secondary dark:hover:bg-token-bg-secondary\"><\/button><\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"2342\" data-end=\"2380\">8 r\u00e8gles d\u2019or pour la mise en \u0153uvre<\/h2>\n<ol data-start=\"2381\" data-end=\"2980\">\n<li data-start=\"2381\" data-end=\"2462\">\n<p data-start=\"2384\" data-end=\"2462\"><strong data-start=\"2384\" data-end=\"2396\">Mur sain<\/strong> : pas de <strong data-start=\"2406\" data-end=\"2431\">remont\u00e9es capillaires<\/strong> (sinon, solution inadapt\u00e9e).<\/p>\n<\/li>\n<li data-start=\"2463\" data-end=\"2530\">\n<p data-start=\"2466\" data-end=\"2530\"><strong data-start=\"2466\" data-end=\"2478\">Bois sec<\/strong> : humidit\u00e9 <strong data-start=\"2490\" data-end=\"2500\">&lt; 18 %<\/strong> (bois et panneaux d\u00e9riv\u00e9s).<\/p>\n<\/li>\n<li data-start=\"2531\" data-end=\"2587\">\n<p data-start=\"2534\" data-end=\"2587\"><strong data-start=\"2534\" data-end=\"2555\">Aucune lame d\u2019air<\/strong> entre mur\/mortier et isolant.<\/p>\n<\/li>\n<li data-start=\"2588\" data-end=\"2649\">\n<p data-start=\"2591\" data-end=\"2649\"><strong data-start=\"2591\" data-end=\"2610\">S\u00e9chage complet<\/strong> du mortier avant isolant + membrane.<\/p>\n<\/li>\n<li data-start=\"2650\" data-end=\"2697\">\n<p data-start=\"2653\" data-end=\"2697\"><strong data-start=\"2653\" data-end=\"2680\">HR int\u00e9rieure ma\u00eetris\u00e9e<\/strong> : <strong data-start=\"2683\" data-end=\"2694\">30\u201365 %<\/strong>.<\/p>\n<\/li>\n<li data-start=\"2698\" data-end=\"2759\">\n<p data-start=\"2701\" data-end=\"2759\"><strong data-start=\"2701\" data-end=\"2723\">\u00c9tanch\u00e9it\u00e9 \u00e0 l\u2019air<\/strong> : au minimum <strong data-start=\"2737\" data-end=\"2756\">RT2012 \/ RE2020<\/strong>.<\/p>\n<\/li>\n<li data-start=\"2760\" data-end=\"2841\">\n<p data-start=\"2763\" data-end=\"2841\"><strong data-start=\"2763\" data-end=\"2778\">Ventilation<\/strong> : <strong data-start=\"2781\" data-end=\"2799\">VMC \u00e9quilibr\u00e9e<\/strong> ; \u00e9viter la <strong data-start=\"2812\" data-end=\"2838\">surpression permanente<\/strong>.<\/p>\n<\/li>\n<li data-start=\"2842\" data-end=\"2980\">\n<p data-start=\"2845\" data-end=\"2980\"><strong data-start=\"2845\" data-end=\"2857\">Parement<\/strong> : <strong data-start=\"2860\" data-end=\"2885\">ouvert \u00e0 la diffusion<\/strong> (ex. pl\u00e2tre, <a href=\"https:\/\/www.la-maison-naturelle.com\/blog\/un-lambris\/\" data-internallinksmanager029f6b8e52c=\"108\" title=\"Qu'est-ce qu'un lambris ?\">lambris<\/a>) ; <strong data-start=\"2910\" data-end=\"2926\"><a href=\"https:\/\/www.la-maison-naturelle.com\/blog\/comparatif-des-panneaux-bois-osb-mdf-hdf-dfp\/\" data-internallinksmanager029f6b8e52c=\"58\" title=\"osb vs mdf\">OSB<\/a> proscrit<\/strong> c\u00f4t\u00e9 int\u00e9rieur. <button class=\"ms-1 flex h-[22px] items-center rounded-xl px-2 relative bottom-[-2px] bg-[#f4f4f4] text-token-text-secondary! hover:bg-token-bg-secondary dark:bg-token-main-surface-secondary dark:hover:bg-token-bg-secondary\"><\/button><\/p>\n<\/li>\n<\/ol>\n<h2 data-start=\"2982\" data-end=\"3030\">D\u00e9tail pratique \u2014 le vide technique (\u2265 22 mm)<\/h2>\n<p data-start=\"3031\" data-end=\"3238\">Plac\u00e9 <strong data-start=\"3037\" data-end=\"3067\">entre membrane et parement<\/strong>, ce vide prot\u00e8ge la membrane (pas de percement lors des fixations) et facilite le <strong data-start=\"3150\" data-end=\"3173\">passage des r\u00e9seaux<\/strong>. Recommand\u00e9 \u00e0 <strong data-start=\"3188\" data-end=\"3199\">\u2265 22 mm<\/strong>. <button class=\"ms-1 flex h-[22px] items-center rounded-xl px-2 relative bottom-[-2px] bg-[#f4f4f4] text-token-text-secondary! hover:bg-token-bg-secondary dark:bg-token-main-surface-secondary dark:hover:bg-token-bg-secondary\"><\/button><\/p>\n<h2 data-start=\"3240\" data-end=\"3284\">\u00c9tanch\u00e9it\u00e9 \u00e0 l\u2019air : soigner les raccords<\/h2>\n<p data-start=\"3285\" data-end=\"3583\">Coller <strong data-start=\"3292\" data-end=\"3318\">tous les recouvrements<\/strong> des l\u00e9s et <strong data-start=\"3330\" data-end=\"3343\">raccorder<\/strong> la membrane aux supports adjacents avec des <strong data-start=\"3388\" data-end=\"3398\">rubans<\/strong> et <strong data-start=\"3402\" data-end=\"3419\">mastic\u2011colles<\/strong> adapt\u00e9s au <strong data-start=\"3431\" data-end=\"3450\">type de support<\/strong> (lisse\/non min\u00e9ral versus min\u00e9ral\/irr\u00e9gulier), conform\u00e9ment aux <strong data-start=\"3515\" data-end=\"3544\">recommandations fabricant<\/strong>. <button class=\"ms-1 flex h-[22px] items-center rounded-xl px-2 relative bottom-[-2px] bg-[#f4f4f4] text-token-text-secondary! hover:bg-token-bg-secondary dark:bg-token-main-surface-secondary dark:hover:bg-token-bg-secondary\"><\/button><\/p>\n<p data-start=\"3585\" data-end=\"3789\"><strong data-start=\"3585\" data-end=\"3599\">\u00c0 retenir.<\/strong> Sur un <strong data-start=\"3607\" data-end=\"3624\">mur en pierre<\/strong>, la <strong data-start=\"3629\" data-end=\"3653\">gestion de la vapeur<\/strong> (Sd variable) et l\u2019<strong data-start=\"3673\" data-end=\"3695\">\u00e9tanch\u00e9it\u00e9 \u00e0 l\u2019air<\/strong> sont <strong data-start=\"3701\" data-end=\"3724\">aussi d\u00e9terminantes<\/strong> que l\u2019\u00e9paisseur d\u2019isolant.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Objectif. Mettre en \u0153uvre une isolation thermique par l\u2019int\u00e9rieur (ITI) sur un mur en pierre massif en garantissant performance et durabilit\u00e9, sur la base d\u2019une validation hygrothermique multi\u2011annuelle et de conditions de mise en \u0153uvre pr\u00e9cises. Le mur support doit \u00eatre sain et exempt de remont\u00e9es capillaires, faute de quoi la solution n\u2019est pas recevable. 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Mettre en \u0153uvre une isolation thermique par l\u2019int\u00e9rieur (ITI) sur un mur en pierre massif en garantissant performance et durabilit\u00e9, sur la base d\u2019une validation hygrothermique multi\u2011annuelle et de conditions de mise en \u0153uvre pr\u00e9cises. Le mur support doit \u00eatre sain et exempt de remont\u00e9es capillaires, faute de quoi la solution n\u2019est pas recevable. 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