{"id":5477,"date":"2025-12-06T13:02:49","date_gmt":"2025-12-06T11:02:49","guid":{"rendered":"https:\/\/bepelesio.lt\/?p=5477"},"modified":"2025-12-06T13:02:50","modified_gmt":"2025-12-06T11:02:50","slug":"mold-on-windows-heres-why-it-happens-and-how-to-keep-it-away","status":"publish","type":"post","link":"https:\/\/bepelesio.lt\/en\/mold-on-windows-heres-why-it-happens-and-how-to-keep-it-away\/","title":{"rendered":"Mold on windows? Here\u2019s why it happens and how to keep it away"},"content":{"rendered":"\n<p>Mold on windows is a common problem during the colder months. It\u2019s not only unpleasant to look at \u2014 <strong>it can also damage window frames, sealing materials, sills, and even pose risks to your health and overall well-being at home.<\/strong><\/p>\n\n\n\n<p>However, you can deal with this issue effectively only if you understand <em>why<\/em> mold forms around windows in the first place and what steps you can take to prevent it.<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of contents<\/h2><nav><ul><li class=\"\"><a href=\"#pagrindines-priezastys-kodel-pelija-langai\">The main reasons why mold grows on windows<\/a><ul><li class=\"\"><a href=\"#per-didele-dregme-patalpose\">High humidity indoors<\/a><\/li><li class=\"\"><a href=\"#netinkama-ventiliacija\">Poor ventilation<\/a><\/li><li class=\"\"><a href=\"#pelesis-ant-langu-del-rasojimo\">Mold on windows from condensation<\/a><\/li><li class=\"\"><a href=\"#defektai\">Window defects<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#mediniai-ir-plastikiniai-langai-kurie-pelija-labiau\">Wooden vs. plastic windows: which ones are more prone to mold?<\/a><\/li><li class=\"\"><a href=\"#kaip-pasalinti-pelesi-nuo-langu\">How to remove mold from windows<\/a><ul><li class=\"\"><a href=\"#kaip-isvengti-pelesio-ateityje\">How to keep mold from coming back<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#ka-daryti-jei-pelesis-vis-grizta\">What to do if mold keeps coming back?<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pagrindines-priezastys-kodel-pelija-langai\"><strong>The main reasons why mold grows on windows<\/strong><\/h2>\n\n\n\n<p>Mold on windows usually appears when condensation builds up on the glass or the window frame. Let\u2019s take a look at the conditions that cause this moisture to form.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"per-didele-dregme-patalpose\"><strong>High humidity indoors<\/strong><\/h3>\n\n\n\n<p><strong>Mold around windows most often appears because <a href=\"https:\/\/bepelesio.lt\/en\/humidity-in-the-home\/\">the indoor air is too humid<\/a>.<\/strong> When warm indoor air comes into contact with a cold surface \u2014 in this case, the window frame \u2014 the moisture condenses and creates ideal conditions for mold spores to grow.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"netinkama-ventiliacija\"><strong>Poor ventilation<\/strong><\/h3>\n\n\n\n<p><strong>Poor or insufficient ventilation can also contribute to mold forming on windows.<\/strong> When a room isn\u2019t aired out regularly, excess moisture builds up \u2014 and that\u2019s the quickest path to mold growth.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"pelesis-ant-langu-del-rasojimo\"><strong>Mold on windows from condensation<\/strong><\/h3>\n\n\n\n<p><strong>Windows that fog up often are much more likely to develop mold. <\/strong>In the kitchen, this usually happens while cooking or if a kettle is placed near the window. In living spaces, condensation can form when you dry laundry indoors, and in the bathroom \u2014 because of heat and steam.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"2240\" height=\"1260\" src=\"https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/rasoja-langas-pelesis-prie-lango.jpg\" alt=\"Foggy windows as a cause of mold buildup\" class=\"wp-image-5421\" title=\"\" srcset=\"https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/rasoja-langas-pelesis-prie-lango.jpg 2240w, https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/rasoja-langas-pelesis-prie-lango-300x169.jpg 300w, https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/rasoja-langas-pelesis-prie-lango-1024x576.jpg 1024w\" sizes=\"(max-width: 2240px) 100vw, 2240px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"defektai\"><strong>Window defects<\/strong><\/h3>\n\n\n\n<p><strong>Window defects or installation issues can also lead to mold.<\/strong> Poor-quality windows, incorrect installation, old frames, or weak sealing can create cold bridges and allow moisture to accumulate.<\/p>\n\n\n\n<p>Also, if you notice mold forming on different surfaces around the room, it\u2019s a sign that the overall humidity is too high. In this case, you should focus on reducing indoor moisture levels. The ideal indoor humidity is around 50%, and if it goes above that, using a <a href=\"https:\/\/bepelesio.lt\/en\/dehumidifiers\/\">dehumidifier<\/a> is recommended.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mediniai-ir-plastikiniai-langai-kurie-pelija-labiau\"><strong>Wooden vs. plastic windows: which ones are more prone to mold?<\/strong><\/h2>\n\n\n\n<p>Both wooden and plastic windows can develop mold, but the conditions that cause it \u2014 and how often it appears \u2014 can differ between the two. Let\u2019s take a closer look.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wooden windows.<\/strong> Wood naturally absorbs moisture \u2014 and in this case, that becomes a problem. Mold can grow deep into the wood, making it very difficult to remove. Mold on wooden windows usually appears because the wood is old, worn out, not impregnated, or when condensation drips onto the wooden surface. A damaged layer of paint or poorly sealed corners can also contribute.<\/li>\n\n\n\n<li><strong>Plastic (PVC) windows.<\/strong> Mold on plastic windows usually forms due to poor ventilation, high humidity indoors, cold bridges, or condensation. PVC windows are very airtight, which means there\u2019s little natural air circulation. The most vulnerable spots are the sealing rubber, the corners of the windowsill, and the edges of the plastic frames.<\/li>\n<\/ul>\n\n\n\n<p>While any window can develop mold if the conditions are right, <strong>plastic windows tend to get moldy more often. However, mold on wooden windows is much more problematic<\/strong> \u2014 it can penetrate deeper into the material, making it harder to remove.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"kaip-pasalinti-pelesi-nuo-langu\"><strong>How to remove mold from windows<\/strong><\/h2>\n\n\n\n<p>First, check how much mold has formed on the windows \u2014 is it just a small spot, or has it spread over a larger area? If the affected area is small, you can <a href=\"https:\/\/bepelesio.lt\/en\/folk-remedies-against-mould\/\">try removing the mold using simple products you already have at home<\/a>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Disinfect the area.<\/strong> You can use a vinegar solution (mix it with water in a 1:1 ratio), hydrogen peroxide, or specialized mold-removal products. Clean not only the visible mold spots but also the surrounding area, and then make sure everything is thoroughly dried.<\/li>\n\n\n\n<li><strong>Remove excess moisture from the room. <\/strong>Wipe off any condensation that collects on the windows, and ventilate the space 2\u20133 times a day. If the humidity is high, use a dehumidifier to keep moisture under control.<\/li>\n\n\n\n<li><strong>Wipe down the windowsills and the window seals.<\/strong> Mold often absorbs into the rubber seals, so cleaning and maintaining them is especially important.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"2240\" height=\"1260\" src=\"https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/pelesio-ant-langu-salinimas-acto-tirpalu.jpg\" alt=\"Removing mold from a window with a vinegar solution\" class=\"wp-image-5426\" title=\"\" srcset=\"https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/pelesio-ant-langu-salinimas-acto-tirpalu.jpg 2240w, https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/pelesio-ant-langu-salinimas-acto-tirpalu-300x169.jpg 300w, https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/pelesio-ant-langu-salinimas-acto-tirpalu-1024x576.jpg 1024w\" sizes=\"(max-width: 2240px) 100vw, 2240px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"kaip-isvengti-pelesio-ateityje\">How to keep mold from coming back<\/h3>\n\n\n\n<p>As mentioned earlier, excess moisture and poor ventilation are two of the most common reasons why mold appears on windows. To minimize the conditions that cause mold, you can take a few simple \u2014 but very effective \u2014 steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If you want to get rid of mold for good, <strong>the two most important factors are proper ventilation and keeping indoor humidity low<\/strong>. Don\u2019t be afraid to open the windows for a few minutes even in winter \u2014 you won\u2019t lose much heat in such a short time, but the rooms will get a boost of fresh air and balanced moisture. Whenever you notice condensation on the windows, wipe it off immediately, dry the area, and try to identify what\u2019s causing the moisture buildup. Ventilation also helps reduce condensation. Use a humidity meter and a dehumidifier to keep humidity levels under control.<\/li>\n\n\n\n<li><strong>Clean your windows and frames regularly to remove built-up dirt, dust, and moisture.<\/strong> Use a soft damp cloth or a dedicated window cleaner if you prefer. Just make sure to dry the window thoroughly afterward \u2014 that part is essential.<\/li>\n\n\n\n<li><strong>Check the drainage system around your windows from time to time <\/strong>\u2014 it\u2019s important to make sure water isn\u2019t accumulating near them. Clean gutters and downpipes regularly to keep everything flowing properly.<\/li>\n\n\n\n<li><strong>Good insulation around the windows is important<\/strong>, but make sure you use proper sealing materials designed for this purpose.<\/li>\n<\/ul>\n\n\n\n<p>According to the <em>Be pel\u0117sio<\/em> specialists, one common mistake people make is keeping too many plants on the windowsill. <em><strong>\u201cA very typical issue is placing lots of plant pots on the windowsill \u2014 plants release moisture as they \u2018breathe,\u2019 which leads to even faster condensation on the windows during the colder months.\u201d<\/strong><\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"2240\" height=\"1260\" src=\"https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/dregno-lango-valymas.jpg\" alt=\"Cleaning a wet window\" class=\"wp-image-5431\" title=\"\" srcset=\"https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/dregno-lango-valymas.jpg 2240w, https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/dregno-lango-valymas-300x169.jpg 300w, https:\/\/bepelesio.lt\/wp-content\/uploads\/2025\/11\/dregno-lango-valymas-1024x576.jpg 1024w\" sizes=\"(max-width: 2240px) 100vw, 2240px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ka-daryti-jei-pelesis-vis-grizta\">What to do if mold keeps coming back?<\/h2>\n\n\n\n<p>If you clean the mold but it keeps coming back after some time \u2014 or if you simply can\u2019t get it under control \u2014 it\u2019s worth <a href=\"https:\/\/bepelesio.lt\/en\/contact\/\">contacting professional mold removal specialists<\/a>.<\/p>\n\n\n\n<p><strong>Our team will assess the situation professionally and recommend an effective, long-lasting solution. <\/strong>Protect not only your windows but your entire home from mold \u2014 it can cause far more damage than you might think.<\/p>\n\n\n\n<div class=\"blog-cta\">\n<div>\n<span class=\"blog-cta-heading\">Forget mould damage for good!<\/span>\n<span class=\"blog-cta-text\">Eradicating deep mould<\/span>\n<span class=\"blog-cta-text\">We work with all objects<\/span>\n<span class=\"blog-cta-text\">Tackling complex causes<\/span>\n<a class=\"btn\" href=\"https:\/\/bepelesio.lt\/en\/contact\/\">Free consultation <svg width=\"7\" height=\"12\" viewBox=\"0 0 7 12\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M4.60078 6.00078L0.700781 2.10078C0.517448 1.91745 0.425781 1.68411 0.425781 1.40078C0.425781 1.11745 0.517448 0.884115 0.700781 0.700781C0.884115 0.517448 1.11745 0.425781 1.40078 0.425781C1.68411 0.425781 1.91745 0.517448 2.10078 0.700781L6.70078 5.30078C6.80078 5.40078 6.87161 5.50911 6.91328 5.62578C6.95495 5.74245 6.97578 5.86745 6.97578 6.00078C6.97578 6.13411 6.95495 6.25911 6.91328 6.37578C6.87161 6.49245 6.80078 6.60078 6.70078 6.70078L2.10078 11.3008C1.91745 11.4841 1.68411 11.5758 1.40078 11.5758C1.11745 11.5758 0.884115 11.4841 0.700781 11.3008C0.517448 11.1174 0.425781 10.8841 0.425781 10.6008C0.425781 10.3174 0.517448 10.0841 0.700781 9.90078L4.60078 6.00078Z\" fill=\"#186FAF\"\/><\/svg><\/a>\n<\/div>\n<div>\n<img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/12\/pamirskite-pelesio-keliama-zala.png\" alt=\"\" title=\"\">\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Mold on windows is a common problem during the colder months. It\u2019s not only unpleasant to look at \u2014 it can also damage window frames, sealing materials, sills, and even pose risks to your health and overall well-being at home. However, you can deal with this issue effectively only if you understand why mold forms [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5419,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25,8],"tags":[],"class_list":["post-5477","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mould","category-pelesis"],"_links":{"self":[{"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/posts\/5477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/comments?post=5477"}],"version-history":[{"count":13,"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/posts\/5477\/revisions"}],"predecessor-version":[{"id":5490,"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/posts\/5477\/revisions\/5490"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/media\/5419"}],"wp:attachment":[{"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/media?parent=5477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/categories?post=5477"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bepelesio.lt\/en\/wp-json\/wp\/v2\/tags?post=5477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}