{"id":2398,"date":"2026-05-01T07:30:50","date_gmt":"2026-05-01T07:30:50","guid":{"rendered":"https:\/\/mywarmhome.co.uk\/newsite\/?p=2398"},"modified":"2026-05-13T16:42:28","modified_gmt":"2026-05-13T16:42:28","slug":"science-behind-mold-and-condensation","status":"publish","type":"post","link":"https:\/\/mywarmhome.co.uk\/newsite\/2026\/05\/01\/science-behind-mold-and-condensation\/","title":{"rendered":"Whats Behind Mold and Condensation?"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">A warm, energy-efficient home only works properly when:<br>insulation + heating + ventilation all work together.<\/h1>\n\n\n\n<p>Cooking, showering, drying clothes and even breathing all add water vapour into the air.<br>When this warm, moist air hits colder surfaces, it turns into condensation.<\/p>\n\n\n\n<p>If this moisture isn\u2019t controlled, it can lead to mould growth.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The Balance!<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Too little ventilation = Moisture builds up \u2192 Condensation \u2192 Mould.<\/li>\n\n\n\n<li>Too much ventilation = Heat is lost \u2192 Home feels cold.<\/li>\n\n\n\n<li>Just right,  Fresh air in =  moisture out \u2192 Healthy home.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-accent-5-color has-custom-color-1-background-color has-text-color has-background has-link-color wp-elements-ccc5c433ea2228b07c242e50777f87fd\">Ventilation is not heat loss, it\u2019s control.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">How retrofit changes our home..<\/h2>\n\n\n\n<p>With insulation and heating upgrades, your home now:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Holds heat better.<\/li>\n\n\n\n<li>Is more airtight.<\/li>\n\n\n\n<li>Needs managed and controlled ventilation, not accidental draughts.<\/li>\n<\/ul>\n\n\n\n<p>Think of it like wearing a warm coat, you still need to adjust the zip if you gret too warm..<\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a0976de6fa18&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a0976de6fa18\" class=\"wp-block-image size-large wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"683\" height=\"1024\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/mywarmhome.co.uk\/newsite\/wp-content\/uploads\/2026\/05\/condeninfo-683x1024.jpg\" alt=\"\" class=\"wp-image-2403\" srcset=\"https:\/\/mywarmhome.co.uk\/newsite\/wp-content\/uploads\/2026\/05\/condeninfo-683x1024.jpg 683w, https:\/\/mywarmhome.co.uk\/newsite\/wp-content\/uploads\/2026\/05\/condeninfo-200x300.jpg 200w, https:\/\/mywarmhome.co.uk\/newsite\/wp-content\/uploads\/2026\/05\/condeninfo-768x1152.jpg 768w, https:\/\/mywarmhome.co.uk\/newsite\/wp-content\/uploads\/2026\/05\/condeninfo.jpg 1024w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\taria-label=\"Enlarge\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.imageButtonRight\"\n\t\t\tdata-wp-style--top=\"state.imageButtonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>USING YOUR HOME CORRECTLY<\/strong><\/h3>\n\n\n\n<p>\u2714 Open trickle vents or background vents.<br>\u2714 Use extractor fans when cooking or showering.<br>\u2714 Keep internal doors slightly open for airflow.<br>\u2714 Heat your home steadily (not on\/off extremes).<br>\u2714 Avoid drying clothes indoors without ventilation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Understanding what goes on behind the scenes!<\/h2>\n\n\n\n<p>Interstitial condensation is the formation of liquid water <em>inside<\/em> the hidden, internal layers of a building\u2019s structure (walls, roofs, or floors) rather than on the visible surface. It occurs when warm, moist air penetrates the building envelope and reaches a cold surface (dew point) within insulation, brickwork, or behind cladding, often causing structural damage, rot, and reduced insulation performance. This is extremely important when internal wall insulation is installed as any failures in design will cause weak points, This allows moisture to venture behind and out of sight. This is why ventilation and attention to design and detail is paramount.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is Relative Humidity (RH)?<\/h2>\n\n\n\n<p>RH tells you how much moisture is in the air. <br>Take a look at the video below to show you what 100% humidity is like.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\" style=\"margin-top:var(--wp--preset--spacing--30);margin-bottom:var(--wp--preset--spacing--30)\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Relative humidity hits 100% in southern China\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/tzb4d8ykSJM?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Below 40%<\/strong> \u2192 Air too dry.<\/li>\n\n\n\n<li><strong>40\u201360%<\/strong> \u2192 Ideal range .<\/li>\n\n\n\n<li><strong>Above 60%<\/strong> \u2192 Risk of condensation &amp; mould .<\/li>\n<\/ul>\n\n\n\n<p>A simple humidity monitor can help you stay in the safe zone.<\/p>\n\n\n\n<p><em>Signs to watch out for.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Water droplets on windows.<\/li>\n\n\n\n<li>Musty smells.<\/li>\n\n\n\n<li>Black spots on walls or ceilings.<\/li>\n\n\n\n<li>Damp patches behind furniture.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What is the Dew Point?<\/h2>\n\n\n\n<p>The dew point is the temperature to which air must cool down to become fully saturated with water vapor and start producing dew, fog, or condensation.  A higher dew point means more moisture in the air, making it feel stickier and more uncomfortable outside.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-accent-5-color has-custom-amber-background-color has-text-color has-background has-link-color wp-elements-d8a513ece491b6206c68827e7254ac40\">Dew point and Relative Humidity (RH) are linked because they both measure moisture in the air, but they do so in different ways: dew point measures the actual amount of moisture, while RH measures how &#8220;full&#8221; the air is with moisture compared to its capacity at a specific temperature.<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-accent-5-color has-custom-color-1-background-color has-text-color has-background has-link-color wp-elements-cd1f7d795933b1e091028aba876e7de6\"><strong>REMEMBER<\/strong>.<br>A warm, energy-efficient home only works properly when:<br>insulation + heating + ventilation all work together.<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>A warm, energy-efficient home only works properly when:insulation + heating + ventilation all work together. Cooking, showering, drying clothes and even breathing all add water vapour into the air.When this warm, moist air hits colder surfaces, it turns into condensation. If this moisture isn\u2019t controlled, it can lead to mould growth. The Balance! Ventilation is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1300,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[10,12,1,13],"tags":[],"class_list":["post-2398","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-efficiency","category-media","category-uncategorized","category-ventilation"],"_links":{"self":[{"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/posts\/2398","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/comments?post=2398"}],"version-history":[{"count":25,"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/posts\/2398\/revisions"}],"predecessor-version":[{"id":2770,"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/posts\/2398\/revisions\/2770"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/media\/1300"}],"wp:attachment":[{"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/media?parent=2398"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/categories?post=2398"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mywarmhome.co.uk\/newsite\/wp-json\/wp\/v2\/tags?post=2398"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}