{"id":8796,"date":"2026-02-24T13:27:50","date_gmt":"2026-02-24T12:27:50","guid":{"rendered":"https:\/\/impera.cat\/?p=8796"},"modified":"2026-03-23T14:32:43","modified_gmt":"2026-03-23T13:32:43","slug":"waterproofing-basements-and-buried-walls-how-to-avoid-permanent-humidity","status":"publish","type":"post","link":"https:\/\/impera.cat\/en\/waterproofing-basements-and-buried-walls-how-to-avoid-permanent-humidity\/","title":{"rendered":"Waterproofing basements and buried walls: how to avoid permanent humidity"},"content":{"rendered":"\n<p>Basements and buried walls are one of the most vulnerable areas of a building in terms of humidity and water leaks. Unlike roofs and facades, these elements are in <strong>direct contact with the ground<\/strong> , constantly exposed to soil moisture, groundwater and hydrostatic pressure.<\/p>\n\n<p>In <strong>Catalonia and the Balearic Islands<\/strong> , where clayey soils, areas with occasional intense rainfall and coastal areas with high environmental humidity coexist, problems in basements are especially frequent. When <strong>professional basement waterproofing<\/strong> has not been carried out, moisture becomes a chronic problem.<\/p>\n\n<p>In this article we explain <strong>why moisture appears in basements<\/strong> , what errors are most common and what solutions exist to guarantee dry and structurally safe spaces.<\/p>\n\n<p><\/p>\n\n<h3 class=\"wp-block-heading\">Why are basements so sensitive to moisture?<\/h3>\n\n<p><\/p>\n\n<p>Unlike other parts of the building, basements are subject to <strong>constant exposure to ground moisture<\/strong> . Water not only comes from rain, but also from:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Soil capillarity<\/li>\n\n\n\n<li>Side leaks<\/li>\n\n\n\n<li>Occasional increase in water table<\/li>\n\n\n\n<li>Accumulated hydrostatic pressure<\/li>\n<\/ul>\n\n<p>When buried walls are not properly waterproofed, water ends up finding its way inside.<\/p>\n\n<p><\/p>\n\n<h3 class=\"wp-block-heading\">Most common types of humidity in basements<\/h3>\n\n<p><\/p>\n\n<h5 class=\"wp-block-heading\"><strong>Moisture by capillarity<\/strong><\/h5>\n\n<p>Water rises through the pores of the materials. It is common in old buildings without waterproof barriers.<\/p>\n\n<p><\/p>\n\n<h5 class=\"wp-block-heading\"><strong>Side leaks<\/strong><\/h5>\n\n<p>Water penetrates directly through buried walls when waterproofing is non-existent or degraded.<\/p>\n\n<p><\/p>\n\n<h5 class=\"wp-block-heading\"><strong>Hydrostatic pressure<\/strong><\/h5>\n\n<p>When the ground accumulates water, it exerts constant pressure on the walls, causing leaks even through the concrete.<\/p>\n\n<p>Correctly identifying the type of humidity is key to applying an effective solution.<\/p>\n\n<p><\/p>\n\n<h2 class=\"wp-block-heading\">Clear symptoms of a poorly waterproofed basement<\/h2>\n\n<p><\/p>\n\n<p>Some common indicators are:<\/p>\n\n<p><\/p>\n\n<ul class=\"wp-block-list\">\n<li>Persistent moisture stains on the walls<\/li>\n\n\n\n<li>Peeling paint or plaster<\/li>\n\n\n\n<li>Appearance of mold<\/li>\n\n\n\n<li>Constant damp smell<\/li>\n\n\n\n<li>Efflorescences (white salts)<\/li>\n\n\n\n<li>Cold and unhealthy environments<\/li>\n<\/ul>\n\n<p><\/p>\n\n<p>These problems not only affect the use of space, but also the structure of the building.<\/p>\n\n<p><\/p>\n\n<h2 class=\"wp-block-heading\">Common errors in basement waterproofing<\/h2>\n\n<p><\/p>\n\n<p>One of the most common mistakes is <strong>trying to solve the problem only from the inside<\/strong> . \u201cAnti-humidity\u201d paints or surface treatments can temporarily hide the problem, but <strong>they do not eliminate the source of the water<\/strong> .<\/p>\n\n<p><\/p>\n\n<p>Other common mistakes are:<\/p>\n\n<p><\/p>\n\n<ul class=\"wp-block-list\">\n<li>Do not act on the outside terrain<\/li>\n\n\n\n<li>Do not install drainage systems<\/li>\n\n\n\n<li>Using materials incompatible with the support<\/li>\n\n\n\n<li>Spot repairs without prior diagnosis<\/li>\n<\/ul>\n\n<p><\/p>\n\n<p>As we explain in our article on the difference between <a href=\"https:\/\/impera.cat\/en\/what-is-professional-waterproofing-and-why-is-it-not-the-same-as-a-one-time-repair\/\"><strong>professional waterproofing and a one-off repair<\/strong> ,<\/a> acting without technical judgment usually worsens the problem over time.<\/p>\n\n<p><\/p>\n\n<h3 class=\"wp-block-heading\">Professional solutions for waterproofing basements<\/h3>\n\n<p><\/p>\n\n<p>The appropriate solution always depends on the condition of the wall, the terrain and the type of humidity. At <strong>IMPERA<\/strong> we apply strategies adapted to each case.<\/p>\n\n<p><\/p>\n\n<h5 class=\"wp-block-heading\"><strong>Exterior waterproofing of buried walls<\/strong><\/h5>\n\n<p>It is the most effective solution when you can intervene from the outside. Includes:<\/p>\n\n<p><\/p>\n\n<ul class=\"wp-block-list\">\n<li>Preparation of the support<\/li>\n\n\n\n<li>Application of waterproof membranes<\/li>\n\n\n\n<li>Mechanical protection<\/li>\n\n\n\n<li>Controlled filling<\/li>\n<\/ul>\n\n<p><\/p>\n\n<h5 class=\"wp-block-heading\"><strong>Drainage sheets<\/strong><\/h5>\n\n<p>They allow water to be evacuated and reduce hydrostatic pressure on the wall.<\/p>\n\n<p><\/p>\n\n<h5 class=\"wp-block-heading\"><strong>Perimeter drainage<\/strong><\/h5>\n\n<p>It channels water towards drainage points, avoiding accumulations around the building.<\/p>\n\n<p><\/p>\n\n<h5 class=\"wp-block-heading\"><strong>Combined systems<\/strong><\/h5>\n\n<p>In many cases, the best solution is a combination of several systems to ensure lasting results.<\/p>\n\n<p><\/p>\n\n<h2 class=\"wp-block-heading\">Particularities in Catalonia and the Balearic Islands<\/h2>\n\n<p><\/p>\n\n<p>In <strong>Catalonia<\/strong> , basements affected by clayey soils and concentrated intense rain are common.<br\/>In the <strong>Balearic Islands<\/strong> , the proximity to the sea, salinity and high water table make particularly robust waterproofing essential.<\/p>\n\n<p>Therefore, each project requires a <strong>specific analysis of the terrain and the environment<\/strong> .<\/p>\n\n<p><\/p>\n\n<h2 class=\"wp-block-heading\">When is it necessary to act without delay?<\/h2>\n\n<p><\/p>\n\n<p>It is advisable to intervene when:<\/p>\n\n<p><\/p>\n\n<ul class=\"wp-block-list\">\n<li>The humidity is persistent.<\/li>\n\n\n\n<li>The space is used as a storage room, garage or home.<\/li>\n\n\n\n<li>There is structural damage or risk of mold.<\/li>\n\n\n\n<li>The property is to be revalued.<\/li>\n<\/ul>\n\n<p><\/p>\n\n<p>Ignoring the problem only increases the cost of future intervention.<\/p>\n\n<p><\/p>\n\n<p><strong>Waterproofing basements and buried walls<\/strong> is a key technical action to guarantee the durability and health of a building. There are no universal solutions, but there are professional methodologies adapted to each case.<\/p>\n\n<p>At <strong>IMPERA<\/strong> we work with technical criteria and proven experience <strong>throughout Catalonia and the Balearic Islands<\/strong> , offering durable solutions adapted to each building.<\/p>\n\n<p>For technical advice, you can <strong><a href=\"https:\/\/impera.cat\/en\/contact\/\">contact us<\/a><\/strong> .<\/p>\n\n<p><\/p>\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Basements and buried walls are one of the most vulnerable areas of a building in terms of humidity and water leaks. Unlike roofs and facades, these elements are in direct contact with the ground , constantly exposed to soil moisture, groundwater and hydrostatic pressure. In Catalonia and the Balearic Islands , where clayey soils, areas [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8917,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[80],"tags":[241,390,389,388,320,172,173,165,387],"class_list":["post-8796","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips","tag-balearic-islands","tag-basements","tag-building-rehabilitation","tag-buried-walls","tag-catalonia","tag-humidity","tag-leaks","tag-waterproofing","tag-waterproofing-of-basements"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Waterproofing basements and buried walls: how to avoid permanent humidity - IMPERA - Impermeabilitzacions i a\u00efllaments d&#039;obra nova, Rehabilitacions<\/title>\n<meta name=\"description\" content=\"Discover how to waterproof basements and buried walls to avoid permanent moisture. 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