{"id":2188,"date":"2026-10-27T14:25:45","date_gmt":"2026-10-27T14:25:45","guid":{"rendered":"https:\/\/solutionsrenovationquebec.ca\/?p=2188"},"modified":"2026-11-04T14:52:15","modified_gmt":"2026-11-04T14:52:15","slug":"my-house-smells-damp-after-the-renovations-in-old-levis-why","status":"publish","type":"post","link":"https:\/\/solutionsrenovationquebec.ca\/en\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/","title":{"rendered":"My house smells damp after renovations in Vieux-L\u00e9vis: why?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">You just invested in renovations, and instead of a fresh and comfortable home, a musty smell sets in. It's frustrating, and it's more common than you'd think, <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/renovation-of-an-ancestral-house-respecting-the-past-in-old-levis\/\">especially in older homes in Old L\u00e9vis.<\/a><\/span><\/p>\n<p><span style=\"font-weight: 400;\">In most cases, the explanation comes down to a broken balance between the home's airtightness and its ventilation. But be careful:<a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/my-basement-smells-weird-is-it-mold-in-saint-henri\/\"> a smell alone does not confirm the presence of mold.<\/a> At Solutions R\u00e9novation Qu\u00e9bec (RBQ license 5811-7821-01), we often see this kind of situation after renovations. We don't do laboratory air analysis, but we know how to recognize the signs that warrant a serious evaluation of the work.<\/span><\/p>\n<h2><b>Why does the musty smell appear after renovations?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A renovation changes how a house behaves. By making the envelope tighter, we alter the way air and moisture circulate, sometimes without realizing it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The result is a house that retains heat better\u2026 and sometimes moisture better. Here are the two main mechanisms at play.<\/span><\/p>\n<h3><b>A tighter house, but not ventilated enough<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">When you change the windows, <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/services\/decontamination-insulation\/\">add insulation or seal air leaks<\/a>, you reduce infiltration. That's the goal: fewer drafts, lower heating bills.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The problem is that the moisture produced indoors used to escape through those same leaks. A tighter house that keeps its old ventilation system therefore ends up accumulating water vapor. The air becomes heavy, and the smell follows.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here, we need to distinguish three things that are often confused. <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/why-does-my-bathroom-smell-moldy-even-after-cleaning-in-levis\/\">An exhaust fan (bathroom, range hood)<\/a> removes air from a single room to the outside. An air exchanger, on the other hand, renews the air throughout the entire house. And the heat recovery ventilator, the famous HRV, does the same thing while recovering some of the heat from the outgoing air. All three do not play the same role.<\/span><\/p>\n<h3><b>Moisture sources that are always present<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Even with good ventilation, moisture continues to be produced every day: showers, cooking, drying laundry indoors, <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/wet-subsoil-at-vieux-levis-is-it-necessary-to-install-a-french-drain\/\">a damp basement, an infiltration or capillary rise through the foundation.<\/a> Improved ventilation helps manage the normal moisture of daily life, but it will never fix a leak or a drainage problem. If water is getting in somewhere, you first need to stop the water.<\/span><\/p>\n<h2><b>The particularities of older homes in Old L\u00e9vis<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Old L\u00e9vis has a character you don't find everywhere: stone houses, brick houses, wooden frames that have weathered the decades. These buildings were designed to \u00abbreathe\u00bb in a certain way.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When you renovate them with modern materials without taking this logic into account, you can create problems that didn't exist before. The issue isn't the age of the house, but the compatibility of what you add to it.<\/span><\/p>\n<h3><b>When modern materials trap moisture<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">An old stone or brick wall manages moisture by letting it migrate and evaporate. If you double it with insulation and a waterproof vapor barrier without analysis, you can block this natural drying. Moisture then remains trapped in the wall, where you can't see it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The right approach depends on the exact composition of the wall and its exposure to wind, rain and sun. A south-facing wall doesn't behave like a north-facing wall that takes the brunt of the weather. That's why we evaluate the assembly before proposing a solution, rather than applying a one-size-fits-all recipe.<\/span><\/p>\n<h4><b>The risk of a double vapor barrier<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">A classic trap: ending up with a membrane that prevents drying on both sides of the wall. When moisture can't dry toward the inside or the outside, <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/moldy-attic-in-winter-in-vieux-levis-the-role-of-condensation-and-frost\/\">it accumulates and eventually causes damage.<\/a> We therefore never prescribe a specific membrane without having examined the existing assembly, because the wrong decision here costs dearly later.<\/span><\/p>\n<h2><b>How to identify the causes without making the problem worse?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Before calling anyone, you can already observe certain things in your home. These checks don't replace an evaluation, but they help guide the next steps.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The important thing is not to make the situation worse by opening walls or scraping suspicious materials. You observe, you take notes, you don't demolish.<\/span><\/p>\n<h3><b>The homeowner's preliminary checks<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Get a hygrometer (a few dollars at the hardware store) and measure the relative humidity in the affected rooms. Note which rooms smell the most, at what time of day, and whether it gets worse after a shower or rain. Observe condensation on the windows and check that your fans and air exchanger start properly when you turn them on. That's it. You don't scrape anything, you don't open any walls.<\/span><\/p>\n<h3><b>When should you request a specialized evaluation?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Certain signs warrant having the situation evaluated: a smell that persists despite ventilation, stains, swollen or deformed materials, condensation that keeps coming back, or a clear worsening after rain. If members of the household <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/mold-in-the-attic-in-levis-what-risks-for-the-health-of-your-family\/\">experience symptoms (cough, irritation, headaches)<\/a>, consult a health professional first. And when mold is visible over a large area, you need a specialist in investigation and decontamination, not just a coat of paint.<\/span><\/p>\n<p><b>Describe the work done and the signs observed to SRQ to discuss the next steps.<\/b><\/p>\n<h2><b>What humidity level should you aim for and what solutions should you consider?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Once the signs are identified, the question becomes: what are we aiming for, and where do we start? The answer almost always combines two aspects, moisture control and ventilation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And above all, an order to follow: fix the cause before redoing the finishes.<\/span><\/p>\n<h3><b>Adjust ventilation and control moisture at the source<\/b><\/h3>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/www.canada.ca\/content\/dam\/hc-sc\/documents\/services\/publications\/healthy-living\/addressing-moisture-mould-your-home\/prendre-charge-problemes-humidite-et-moisissure-votre-demeure.pdf\">Health Canada generally recommends maintaining indoor relative humidity between 30 and 50%.<\/a>. In the middle of a Quebec winter, the goal is rather the lower end of this range: if condensation is running down your windows, it\u2019s a sign that the level needs to be lowered.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Concretely, this can mean installing or adjusting an HRV to renew the air in the house, making sure that the bathroom and kitchen exhaust fans <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/attic-ventilation-why-its-crucial-for-lisolation-a-levis\/\">actually vent to the outside<\/a>, and occasionally dehumidifying a basement that is too humid. It must be said honestly, however: a dehumidifier alone will not solve a ventilation problem or an infiltration. It treats a symptom, not the cause.<\/span><\/p>\n<h3><b>Correct the cause before redoing the finishes<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The logical order is this: we look for the source of the humidity, we check the ventilation and the assemblies, we correct the infiltration or the identified defect, and only then do we repair the damaged surfaces.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Skipping steps is the best way to pay twice. <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/water-stains-on-the-ceiling-in-levis-should-you-repaint-or-repair\/\">An antifungal paint applied to a wall that is still damp<\/a> will mask the problem for a few months, then it will come back, often worse. You never close up a wall over a cause you haven't fixed.<\/span><\/p>\n<p><b>Before repainting or closing up a wall, have the probable cause and the necessary work clarified.<\/b><\/p>\n<h2><b>How much can fixing a humidity problem cost?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">It's hard to give a single figure, because everything depends on what we find. The price varies according to the source of the problem, the accessibility of the premises, the layout of the ventilation ducts, the extent of the finishing repairs and whether or not decontamination is necessary.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For informational purposes only, the installation of an HRV in Quebec is generally between $2,300 and $6,500 depending on the model and complexity (2026\u20132027 estimate, to be validated with recent local sources). This is not an SRQ quote, and any potential financial assistance (for example through a program like R\u00e9noclimat) must be verified according to the criteria in effect at the time of the work. The only way to get a real figure is a quote based on your actual situation.<\/span><\/p>\n<h2><b>Why entrust the evaluation of the work to SRQ?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">We don't present ourselves as a laboratory or as a certified mold expert, that's not our trade. Our trade is well-done residential renovation, and it starts with understanding what's happening at your place before proposing anything.<\/span><\/p>\n<h3><b>A clear process, from needs assessment to delivery<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Our way of working is simple: we talk with you and assess the work on site, we prepare a detailed quote, we plan the job site, we execute, we verify and we deliver clean. Every step is transparent. If the situation goes beyond general renovation and requires an air quality or decontamination specialist, we tell you clearly rather than improvising.<\/span><\/p>\n<h3><b>A local business and concrete commitments<\/b><\/h3>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/about\/\">SRQ is a business from your area<\/a>, with its RBQ license 5811-7821-01, more than 10 years of combined experience and more than 500 projects completed in the region. Our five-year warranty on labour applies according to its conditions, which we explain to you in advance, without surprise fine print. We prefer commitments we can keep to impossible promises.<\/span><\/p>\n<p><b>Request a quote for the necessary renovation work, according to the identified cause.<\/b><\/p>\n<h2><b>FAQ: humidity after renovation in L\u00e9vis<\/b><\/h2>\n<h3><b>What humidity level is recommended in winter in Quebec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Health Canada suggests staying between 30 and 50% relative humidity. In winter, aim for the lower end of that range: if your windows are running with condensation, it means you need to lower the level.<\/span><\/p>\n<h3><b>Does a musty smell mean there is mold?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Not necessarily. The smell indicates excess humidity or a ventilation problem, but only an on-site check can confirm the presence of mold. <a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/my-basement-smells-moldy-in-levis-is-it-serious-doctor\/\">A persistent smell is still worth taking seriously.<\/a><\/span><\/p>\n<h3><b>Should an air exchanger run continuously?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Not always, but it must run enough to renew the air, especially in winter when the house is closed up. Several models operate in cycles or adjust according to humidity. The important thing is that it actually does its job.<\/span><\/p>\n<h3><b>Can a poorly installed vapour barrier cause humidity?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Yes. A misplaced or doubled vapour barrier can prevent a wall from drying and trap humidity in it. It's a common problem in renovations of older houses, and it requires an assessment of the assembly.<\/span><\/p>\n<h3><b>Is an HRV mandatory in an already-built house?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">No, an HRV is not automatically required in an existing house. Ventilation requirements mainly target new construction and certain major renovations. That said, <a href=\"https:\/\/ressources-naturelles.canada.ca\/histoires\/pleins-feux-efficacite-energitique\/qu-qu-ventilateur-recuperateur-chaleur-energie-pourquoi-ai-besoin\">in a house that has become very airtight, an HRV is often the most effective solution.<\/a><\/span><\/p>\n<h3><b>Do the stone walls of Old L\u00e9vis require particular materials?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Often, yes. Old walls manage humidity differently, and you must choose materials compatible with their ability to dry. The right solution depends on the composition of the wall and its exposure, hence the importance of an assessment.<\/span><\/p>\n<h3><b>Is a dehumidifier enough to solve the problem?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Rarely on its own. A dehumidifier reduces ambient humidity, but it doesn't renew the air and doesn't correct either an infiltration or a ventilation defect. It's a complement, not a complete solution.<\/span><\/p>\n<h3><b>Who to contact if the smell returns after the work?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Start by noting the signs observed and contact a contractor to have the work evaluated. In the case of extensive mold or health symptoms, a decontamination specialist or a health professional should be consulted.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A smell of humidity after renovations is not inevitable, and it's not normal either. It's a signal that must be listened to, understood and corrected in the right order, before redoing the finishes.<\/span><\/p>\n<p><b><a href=\"https:\/\/solutionsrenovationquebec.ca\/en\/contact\/\">Contact SRQ to discuss your project<\/a> and get a quote adapted to the required work.<\/b><\/p>","protected":false},"excerpt":{"rendered":"<p>Vous venez d&rsquo;investir dans des travaux, et au lieu d&rsquo;une maison fra\u00eeche et confortable, une odeur d&rsquo;humidit\u00e9 s&rsquo;installe. C&rsquo;est frustrant, et c&rsquo;est plus fr\u00e9quent qu&rsquo;on pense, surtout dans les maisons plus \u00e2g\u00e9es du Vieux-L\u00e9vis. Dans la plupart des cas, l&rsquo;explication tient \u00e0 un \u00e9quilibre bris\u00e9 entre l&rsquo;\u00e9tanch\u00e9it\u00e9 de la maison et sa ventilation. Mais attention [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2188","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Maison qui sent l\u2019humidit\u00e9 apr\u00e8s r\u00e9nos \u00e0 Vieux-L\u00e9vis?<\/title>\n<meta name=\"description\" content=\"Ma maison sent l\u2019humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi? Dans la plupart des cas, c\u2019est un \u00e9quilibre bris\u00e9 entre l\u2019\u00e9tanch\u00e9it\u00e9 et la ventilation. De nouvelles fen\u00eatres, de l\u2019isolation ajout\u00e9e ou un calfeutrage serr\u00e9 r\u00e9duisent les fuites d\u2019air par o\u00f9 l\u2019humidit\u00e9 s\u2019\u00e9chappait. La vapeur des douches, de la cuisson, du linge qui s\u00e8che ou d\u2019un sous-sol humide reste alors pi\u00e9g\u00e9e dans la maison. Une odeur, \u00e0 elle seule, ne confirme pas la pr\u00e9sence de moisissure.Solutions R\u00e9novation Qu\u00e9bec (SRQ), entrepreneur en r\u00e9novation r\u00e9sidentielle licenci\u00e9 RBQ 5811-7821-01, t\u2019explique trois choses :Ventilation : la diff\u00e9rence entre un ventilateur d\u2019extraction, un \u00e9changeur d\u2019air et un ventilateur r\u00e9cup\u00e9rateur de chaleur (VRC).Maisons anciennes : pourquoi les maisons en pierre, en brique et \u00e0 charpente de bois du Vieux-L\u00e9vis r\u00e9agissent mal \u00e0 certains mat\u00e9riaux modernes. Un isolant mal choisi ou un double pare-vapeur peut emp\u00eacher le mur de s\u00e9cher et y emprisonner l\u2019humidit\u00e9.V\u00e9rifications de base : ce que tu peux observer sans d\u00e9molir, avec un hygrom\u00e8tre, la condensation aux fen\u00eatres, les pi\u00e8ces qui sentent le plus et le d\u00e9marrage des ventilateurs.Tu y trouves aussi :le taux d\u2019humidit\u00e9 relative recommand\u00e9 par Sant\u00e9 Canada, entre 30 et 50 %, en visant le bas de la plage l\u2019hiver ;les signes qui demandent une \u00e9valuation, comme des taches, des mat\u00e9riaux gonfl\u00e9s ou une odeur qui empire apr\u00e8s la pluie ;quand consulter un sp\u00e9cialiste en d\u00e9contamination ou un professionnel de la sant\u00e9 ;pourquoi un d\u00e9shumidificateur seul ne r\u00e8gle pas la cause ;l\u2019ordre logique des travaux : trouver la source, corriger l\u2019infiltration ou la ventilation, puis seulement refaire les finis ;le co\u00fbt indicatif d\u2019un VRC au Qu\u00e9bec, d\u2019environ 2 300 $ \u00e0 6 500 $ (estimation), et l\u2019admissibilit\u00e9 possible \u00e0 R\u00e9noclimat.SRQ compte plus de 500 projets r\u00e9alis\u00e9s et offre une garantie de 5 ans sur la main-d\u2019\u0153uvre. Soumission gratuite \u00e0 Vieux-L\u00e9vis et partout \u00e0 L\u00e9vis au 418-476-1747.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/solutionsrenovationquebec.ca\/en\/my-house-smells-damp-after-the-renovations-in-old-levis-why\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Maison qui sent l\u2019humidit\u00e9 apr\u00e8s r\u00e9nos \u00e0 Vieux-L\u00e9vis?\" \/>\n<meta property=\"og:description\" content=\"Ma maison sent l\u2019humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi? Dans la plupart des cas, c\u2019est un \u00e9quilibre bris\u00e9 entre l\u2019\u00e9tanch\u00e9it\u00e9 et la ventilation. De nouvelles fen\u00eatres, de l\u2019isolation ajout\u00e9e ou un calfeutrage serr\u00e9 r\u00e9duisent les fuites d\u2019air par o\u00f9 l\u2019humidit\u00e9 s\u2019\u00e9chappait. La vapeur des douches, de la cuisson, du linge qui s\u00e8che ou d\u2019un sous-sol humide reste alors pi\u00e9g\u00e9e dans la maison. Une odeur, \u00e0 elle seule, ne confirme pas la pr\u00e9sence de moisissure.Solutions R\u00e9novation Qu\u00e9bec (SRQ), entrepreneur en r\u00e9novation r\u00e9sidentielle licenci\u00e9 RBQ 5811-7821-01, t\u2019explique trois choses :Ventilation : la diff\u00e9rence entre un ventilateur d\u2019extraction, un \u00e9changeur d\u2019air et un ventilateur r\u00e9cup\u00e9rateur de chaleur (VRC).Maisons anciennes : pourquoi les maisons en pierre, en brique et \u00e0 charpente de bois du Vieux-L\u00e9vis r\u00e9agissent mal \u00e0 certains mat\u00e9riaux modernes. Un isolant mal choisi ou un double pare-vapeur peut emp\u00eacher le mur de s\u00e9cher et y emprisonner l\u2019humidit\u00e9.V\u00e9rifications de base : ce que tu peux observer sans d\u00e9molir, avec un hygrom\u00e8tre, la condensation aux fen\u00eatres, les pi\u00e8ces qui sentent le plus et le d\u00e9marrage des ventilateurs.Tu y trouves aussi :le taux d\u2019humidit\u00e9 relative recommand\u00e9 par Sant\u00e9 Canada, entre 30 et 50 %, en visant le bas de la plage l\u2019hiver ;les signes qui demandent une \u00e9valuation, comme des taches, des mat\u00e9riaux gonfl\u00e9s ou une odeur qui empire apr\u00e8s la pluie ;quand consulter un sp\u00e9cialiste en d\u00e9contamination ou un professionnel de la sant\u00e9 ;pourquoi un d\u00e9shumidificateur seul ne r\u00e8gle pas la cause ;l\u2019ordre logique des travaux : trouver la source, corriger l\u2019infiltration ou la ventilation, puis seulement refaire les finis ;le co\u00fbt indicatif d\u2019un VRC au Qu\u00e9bec, d\u2019environ 2 300 $ \u00e0 6 500 $ (estimation), et l\u2019admissibilit\u00e9 possible \u00e0 R\u00e9noclimat.SRQ compte plus de 500 projets r\u00e9alis\u00e9s et offre une garantie de 5 ans sur la main-d\u2019\u0153uvre. Soumission gratuite \u00e0 Vieux-L\u00e9vis et partout \u00e0 L\u00e9vis au 418-476-1747.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/solutionsrenovationquebec.ca\/en\/my-house-smells-damp-after-the-renovations-in-old-levis-why\/\" \/>\n<meta property=\"og:site_name\" content=\"Solutions R\u00e9novation Qu\u00e9bec\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-27T14:25:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-11-04T14:52:15+00:00\" \/>\n<meta name=\"author\" content=\"ilias\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Maison qui sent l\u2019humidit\u00e9 apr\u00e8s r\u00e9nos \u00e0 Vieux-L\u00e9vis?\" \/>\n<meta name=\"twitter:description\" content=\"Ma maison sent l\u2019humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi? Dans la plupart des cas, c\u2019est un \u00e9quilibre bris\u00e9 entre l\u2019\u00e9tanch\u00e9it\u00e9 et la ventilation. De nouvelles fen\u00eatres, de l\u2019isolation ajout\u00e9e ou un calfeutrage serr\u00e9 r\u00e9duisent les fuites d\u2019air par o\u00f9 l\u2019humidit\u00e9 s\u2019\u00e9chappait. La vapeur des douches, de la cuisson, du linge qui s\u00e8che ou d\u2019un sous-sol humide reste alors pi\u00e9g\u00e9e dans la maison. Une odeur, \u00e0 elle seule, ne confirme pas la pr\u00e9sence de moisissure.Solutions R\u00e9novation Qu\u00e9bec (SRQ), entrepreneur en r\u00e9novation r\u00e9sidentielle licenci\u00e9 RBQ 5811-7821-01, t\u2019explique trois choses :Ventilation : la diff\u00e9rence entre un ventilateur d\u2019extraction, un \u00e9changeur d\u2019air et un ventilateur r\u00e9cup\u00e9rateur de chaleur (VRC).Maisons anciennes : pourquoi les maisons en pierre, en brique et \u00e0 charpente de bois du Vieux-L\u00e9vis r\u00e9agissent mal \u00e0 certains mat\u00e9riaux modernes. Un isolant mal choisi ou un double pare-vapeur peut emp\u00eacher le mur de s\u00e9cher et y emprisonner l\u2019humidit\u00e9.V\u00e9rifications de base : ce que tu peux observer sans d\u00e9molir, avec un hygrom\u00e8tre, la condensation aux fen\u00eatres, les pi\u00e8ces qui sentent le plus et le d\u00e9marrage des ventilateurs.Tu y trouves aussi :le taux d\u2019humidit\u00e9 relative recommand\u00e9 par Sant\u00e9 Canada, entre 30 et 50 %, en visant le bas de la plage l\u2019hiver ;les signes qui demandent une \u00e9valuation, comme des taches, des mat\u00e9riaux gonfl\u00e9s ou une odeur qui empire apr\u00e8s la pluie ;quand consulter un sp\u00e9cialiste en d\u00e9contamination ou un professionnel de la sant\u00e9 ;pourquoi un d\u00e9shumidificateur seul ne r\u00e8gle pas la cause ;l\u2019ordre logique des travaux : trouver la source, corriger l\u2019infiltration ou la ventilation, puis seulement refaire les finis ;le co\u00fbt indicatif d\u2019un VRC au Qu\u00e9bec, d\u2019environ 2 300 $ \u00e0 6 500 $ (estimation), et l\u2019admissibilit\u00e9 possible \u00e0 R\u00e9noclimat.SRQ compte plus de 500 projets r\u00e9alis\u00e9s et offre une garantie de 5 ans sur la main-d\u2019\u0153uvre. Soumission gratuite \u00e0 Vieux-L\u00e9vis et partout \u00e0 L\u00e9vis au 418-476-1747.\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"ilias\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\\\/\"},\"author\":{\"name\":\"ilias\",\"@id\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/#\\\/schema\\\/person\\\/bc9dfc39f32d5a847eb6f89e333e1877\"},\"headline\":\"Ma maison sent l&rsquo;humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi?\",\"datePublished\":\"2026-10-27T14:25:45+00:00\",\"dateModified\":\"2026-11-04T14:52:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\\\/\"},\"wordCount\":2267,\"publisher\":{\"@id\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/#organization\"},\"inLanguage\":\"en-CA\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\\\/\",\"url\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\\\/\",\"name\":\"Maison qui sent l\u2019humidit\u00e9 apr\u00e8s r\u00e9nos \u00e0 Vieux-L\u00e9vis?\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/solutionsrenovationquebec.ca\\\/#website\"},\"datePublished\":\"2026-10-27T14:25:45+00:00\",\"dateModified\":\"2026-11-04T14:52:15+00:00\",\"description\":\"Ma maison sent l\u2019humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi? Dans la plupart des cas, c\u2019est un \u00e9quilibre bris\u00e9 entre l\u2019\u00e9tanch\u00e9it\u00e9 et la ventilation. De nouvelles fen\u00eatres, de l\u2019isolation ajout\u00e9e ou un calfeutrage serr\u00e9 r\u00e9duisent les fuites d\u2019air par o\u00f9 l\u2019humidit\u00e9 s\u2019\u00e9chappait. La vapeur des douches, de la cuisson, du linge qui s\u00e8che ou d\u2019un sous-sol humide reste alors pi\u00e9g\u00e9e dans la maison. Une odeur, \u00e0 elle seule, ne confirme pas la pr\u00e9sence de moisissure.Solutions R\u00e9novation Qu\u00e9bec (SRQ), entrepreneur en r\u00e9novation r\u00e9sidentielle licenci\u00e9 RBQ 5811-7821-01, t\u2019explique trois choses :Ventilation : la diff\u00e9rence entre un ventilateur d\u2019extraction, un \u00e9changeur d\u2019air et un ventilateur r\u00e9cup\u00e9rateur de chaleur (VRC).Maisons anciennes : pourquoi les maisons en pierre, en brique et \u00e0 charpente de bois du Vieux-L\u00e9vis r\u00e9agissent mal \u00e0 certains mat\u00e9riaux modernes. Un isolant mal choisi ou un double pare-vapeur peut emp\u00eacher le mur de s\u00e9cher et y emprisonner l\u2019humidit\u00e9.V\u00e9rifications de base : ce que tu peux observer sans d\u00e9molir, avec un hygrom\u00e8tre, la condensation aux fen\u00eatres, les pi\u00e8ces qui sentent le plus et le d\u00e9marrage des ventilateurs.Tu y trouves aussi :le taux d\u2019humidit\u00e9 relative recommand\u00e9 par Sant\u00e9 Canada, entre 30 et 50 %, en visant le bas de la plage l\u2019hiver ;les signes qui demandent une \u00e9valuation, comme des taches, des mat\u00e9riaux gonfl\u00e9s ou une odeur qui empire apr\u00e8s la pluie ;quand consulter un sp\u00e9cialiste en d\u00e9contamination ou un professionnel de la sant\u00e9 ;pourquoi un d\u00e9shumidificateur seul ne r\u00e8gle pas la cause ;l\u2019ordre logique des travaux : trouver la source, corriger l\u2019infiltration ou la ventilation, puis seulement refaire les finis ;le co\u00fbt indicatif d\u2019un VRC au Qu\u00e9bec, d\u2019environ 2 300 $ \u00e0 6 500 $ (estimation), et l\u2019admissibilit\u00e9 possible \u00e0 R\u00e9noclimat.SRQ compte plus de 500 projets r\u00e9alis\u00e9s et offre une garantie de 5 ans sur la main-d\u2019\u0153uvre. 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In most cases, it's a broken balance between airtightness and ventilation. New windows, added insulation or tight caulking reduce the air leaks through which moisture escaped. Steam from showers, cooking, drying laundry or a damp basement then remains trapped in the house. An odor alone does not confirm the presence of mold.Solutions R\u00e9novation Qu\u00e9bec (SRQ), a licensed residential renovation contractor RBQ 5811-7821-01, explains three things to you:Ventilation: the difference between an exhaust fan, an air exchanger and a heat recovery ventilator (HRV).Old houses: why the stone, brick and wood-frame houses of Old L\u00e9vis react poorly to certain modern materials. A poorly chosen insulator or a double vapor barrier can prevent the wall from drying and trap moisture in it.Basic checks: what you can observe without demolishing, with a hygrometer, condensation on windows, the rooms that smell the most and the starting of the fans.You will also find:the relative humidity level recommended by Health Canada, between 30 and 50 %, aiming for the low end of the range in winter;the signs that require an evaluation, such as stains, swollen materials or an odor that worsens after rain;when to consult a decontamination specialist or a health professional;why a dehumidifier alone does not solve the cause;the logical order of the work: find the source, correct the infiltration or ventilation, then only redo the finishes;the indicative cost of an HRV in Quebec, approximately 2,300 $ to 6,500 $ (estimate), and possible eligibility for R\u00e9noclimat.SRQ has completed more than 500 projects and offers a 5-year warranty on labor. Free quote in Old L\u00e9vis and everywhere in L\u00e9vis at 418-476-1747.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/solutionsrenovationquebec.ca\/en\/my-house-smells-damp-after-the-renovations-in-old-levis-why\/","og_locale":"en_US","og_type":"article","og_title":"Maison qui sent l\u2019humidit\u00e9 apr\u00e8s r\u00e9nos \u00e0 Vieux-L\u00e9vis?","og_description":"Ma maison sent l\u2019humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi? Dans la plupart des cas, c\u2019est un \u00e9quilibre bris\u00e9 entre l\u2019\u00e9tanch\u00e9it\u00e9 et la ventilation. De nouvelles fen\u00eatres, de l\u2019isolation ajout\u00e9e ou un calfeutrage serr\u00e9 r\u00e9duisent les fuites d\u2019air par o\u00f9 l\u2019humidit\u00e9 s\u2019\u00e9chappait. La vapeur des douches, de la cuisson, du linge qui s\u00e8che ou d\u2019un sous-sol humide reste alors pi\u00e9g\u00e9e dans la maison. Une odeur, \u00e0 elle seule, ne confirme pas la pr\u00e9sence de moisissure.Solutions R\u00e9novation Qu\u00e9bec (SRQ), entrepreneur en r\u00e9novation r\u00e9sidentielle licenci\u00e9 RBQ 5811-7821-01, t\u2019explique trois choses :Ventilation : la diff\u00e9rence entre un ventilateur d\u2019extraction, un \u00e9changeur d\u2019air et un ventilateur r\u00e9cup\u00e9rateur de chaleur (VRC).Maisons anciennes : pourquoi les maisons en pierre, en brique et \u00e0 charpente de bois du Vieux-L\u00e9vis r\u00e9agissent mal \u00e0 certains mat\u00e9riaux modernes. Un isolant mal choisi ou un double pare-vapeur peut emp\u00eacher le mur de s\u00e9cher et y emprisonner l\u2019humidit\u00e9.V\u00e9rifications de base : ce que tu peux observer sans d\u00e9molir, avec un hygrom\u00e8tre, la condensation aux fen\u00eatres, les pi\u00e8ces qui sentent le plus et le d\u00e9marrage des ventilateurs.Tu y trouves aussi :le taux d\u2019humidit\u00e9 relative recommand\u00e9 par Sant\u00e9 Canada, entre 30 et 50 %, en visant le bas de la plage l\u2019hiver ;les signes qui demandent une \u00e9valuation, comme des taches, des mat\u00e9riaux gonfl\u00e9s ou une odeur qui empire apr\u00e8s la pluie ;quand consulter un sp\u00e9cialiste en d\u00e9contamination ou un professionnel de la sant\u00e9 ;pourquoi un d\u00e9shumidificateur seul ne r\u00e8gle pas la cause ;l\u2019ordre logique des travaux : trouver la source, corriger l\u2019infiltration ou la ventilation, puis seulement refaire les finis ;le co\u00fbt indicatif d\u2019un VRC au Qu\u00e9bec, d\u2019environ 2 300 $ \u00e0 6 500 $ (estimation), et l\u2019admissibilit\u00e9 possible \u00e0 R\u00e9noclimat.SRQ compte plus de 500 projets r\u00e9alis\u00e9s et offre une garantie de 5 ans sur la main-d\u2019\u0153uvre. Soumission gratuite \u00e0 Vieux-L\u00e9vis et partout \u00e0 L\u00e9vis au 418-476-1747.","og_url":"https:\/\/solutionsrenovationquebec.ca\/en\/my-house-smells-damp-after-the-renovations-in-old-levis-why\/","og_site_name":"Solutions R\u00e9novation Qu\u00e9bec","article_published_time":"2026-10-27T14:25:45+00:00","article_modified_time":"2026-11-04T14:52:15+00:00","author":"ilias","twitter_card":"summary_large_image","twitter_title":"Maison qui sent l\u2019humidit\u00e9 apr\u00e8s r\u00e9nos \u00e0 Vieux-L\u00e9vis?","twitter_description":"Ma maison sent l\u2019humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi? Dans la plupart des cas, c\u2019est un \u00e9quilibre bris\u00e9 entre l\u2019\u00e9tanch\u00e9it\u00e9 et la ventilation. De nouvelles fen\u00eatres, de l\u2019isolation ajout\u00e9e ou un calfeutrage serr\u00e9 r\u00e9duisent les fuites d\u2019air par o\u00f9 l\u2019humidit\u00e9 s\u2019\u00e9chappait. La vapeur des douches, de la cuisson, du linge qui s\u00e8che ou d\u2019un sous-sol humide reste alors pi\u00e9g\u00e9e dans la maison. Une odeur, \u00e0 elle seule, ne confirme pas la pr\u00e9sence de moisissure.Solutions R\u00e9novation Qu\u00e9bec (SRQ), entrepreneur en r\u00e9novation r\u00e9sidentielle licenci\u00e9 RBQ 5811-7821-01, t\u2019explique trois choses :Ventilation : la diff\u00e9rence entre un ventilateur d\u2019extraction, un \u00e9changeur d\u2019air et un ventilateur r\u00e9cup\u00e9rateur de chaleur (VRC).Maisons anciennes : pourquoi les maisons en pierre, en brique et \u00e0 charpente de bois du Vieux-L\u00e9vis r\u00e9agissent mal \u00e0 certains mat\u00e9riaux modernes. Un isolant mal choisi ou un double pare-vapeur peut emp\u00eacher le mur de s\u00e9cher et y emprisonner l\u2019humidit\u00e9.V\u00e9rifications de base : ce que tu peux observer sans d\u00e9molir, avec un hygrom\u00e8tre, la condensation aux fen\u00eatres, les pi\u00e8ces qui sentent le plus et le d\u00e9marrage des ventilateurs.Tu y trouves aussi :le taux d\u2019humidit\u00e9 relative recommand\u00e9 par Sant\u00e9 Canada, entre 30 et 50 %, en visant le bas de la plage l\u2019hiver ;les signes qui demandent une \u00e9valuation, comme des taches, des mat\u00e9riaux gonfl\u00e9s ou une odeur qui empire apr\u00e8s la pluie ;quand consulter un sp\u00e9cialiste en d\u00e9contamination ou un professionnel de la sant\u00e9 ;pourquoi un d\u00e9shumidificateur seul ne r\u00e8gle pas la cause ;l\u2019ordre logique des travaux : trouver la source, corriger l\u2019infiltration ou la ventilation, puis seulement refaire les finis ;le co\u00fbt indicatif d\u2019un VRC au Qu\u00e9bec, d\u2019environ 2 300 $ \u00e0 6 500 $ (estimation), et l\u2019admissibilit\u00e9 possible \u00e0 R\u00e9noclimat.SRQ compte plus de 500 projets r\u00e9alis\u00e9s et offre une garantie de 5 ans sur la main-d\u2019\u0153uvre. Soumission gratuite \u00e0 Vieux-L\u00e9vis et partout \u00e0 L\u00e9vis au 418-476-1747.","twitter_misc":{"Written by":"ilias","Est. reading time":"9 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/#article","isPartOf":{"@id":"https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/"},"author":{"name":"ilias","@id":"https:\/\/solutionsrenovationquebec.ca\/#\/schema\/person\/bc9dfc39f32d5a847eb6f89e333e1877"},"headline":"Ma maison sent l&rsquo;humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi?","datePublished":"2026-10-27T14:25:45+00:00","dateModified":"2026-11-04T14:52:15+00:00","mainEntityOfPage":{"@id":"https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/"},"wordCount":2267,"publisher":{"@id":"https:\/\/solutionsrenovationquebec.ca\/#organization"},"inLanguage":"en-CA"},{"@type":"WebPage","@id":"https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/","url":"https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/","name":"House that smells damp after renovations in Old L\u00e9vis?","isPartOf":{"@id":"https:\/\/solutionsrenovationquebec.ca\/#website"},"datePublished":"2026-10-27T14:25:45+00:00","dateModified":"2026-11-04T14:52:15+00:00","description":"My house smells musty after renovations in Old L\u00e9vis: why? In most cases, it's a broken balance between airtightness and ventilation. New windows, added insulation or tight caulking reduce the air leaks through which moisture escaped. Steam from showers, cooking, drying laundry or a damp basement then remains trapped in the house. An odor alone does not confirm the presence of mold.Solutions R\u00e9novation Qu\u00e9bec (SRQ), a licensed residential renovation contractor RBQ 5811-7821-01, explains three things to you:Ventilation: the difference between an exhaust fan, an air exchanger and a heat recovery ventilator (HRV).Old houses: why the stone, brick and wood-frame houses of Old L\u00e9vis react poorly to certain modern materials. A poorly chosen insulator or a double vapor barrier can prevent the wall from drying and trap moisture in it.Basic checks: what you can observe without demolishing, with a hygrometer, condensation on windows, the rooms that smell the most and the starting of the fans.You will also find:the relative humidity level recommended by Health Canada, between 30 and 50 %, aiming for the low end of the range in winter;the signs that require an evaluation, such as stains, swollen materials or an odor that worsens after rain;when to consult a decontamination specialist or a health professional;why a dehumidifier alone does not solve the cause;the logical order of the work: find the source, correct the infiltration or ventilation, then only redo the finishes;the indicative cost of an HRV in Quebec, approximately 2,300 $ to 6,500 $ (estimate), and possible eligibility for R\u00e9noclimat.SRQ has completed more than 500 projects and offers a 5-year warranty on labor. Free quote in Old L\u00e9vis and everywhere in L\u00e9vis at 418-476-1747.","breadcrumb":{"@id":"https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/#breadcrumb"},"inLanguage":"en-CA","potentialAction":[{"@type":"ReadAction","target":["https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/solutionsrenovationquebec.ca\/ma-maison-sent-lhumidite-apres-les-renovations-a-vieux-levis-pourquoi\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/solutionsrenovationquebec.ca\/"},{"@type":"ListItem","position":2,"name":"Ma maison sent l&#8217;humidit\u00e9 apr\u00e8s les r\u00e9novations \u00e0 Vieux-L\u00e9vis : pourquoi?"}]},{"@type":"WebSite","@id":"https:\/\/solutionsrenovationquebec.ca\/#website","url":"https:\/\/solutionsrenovationquebec.ca\/","name":"Solutions R\u00e9novation Qu\u00e9bec","description":"Turn Your House Into Your Home. 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