{"id":9092,"date":"2026-05-27T11:50:52","date_gmt":"2026-05-27T09:50:52","guid":{"rendered":"https:\/\/impera.cat\/?p=9092"},"modified":"2026-05-14T12:53:11","modified_gmt":"2026-05-14T10:53:11","slug":"why-many-flat-roofs-accumulate-water-even-when-they-are-new","status":"publish","type":"post","link":"https:\/\/impera.cat\/en\/why-many-flat-roofs-accumulate-water-even-when-they-are-new\/","title":{"rendered":"Why many flat roofs accumulate water even when they are new"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Many people think that a new roof should not present any problems for years. However, at <strong>IMPERA<\/strong> we are detecting more and more cases of relatively new flat roofs that accumulate water after each rain.<\/p>\n\n<p class=\"wp-block-paragraph\">This seemingly minor problem can end up causing leaks, premature degradation of materials and costly interventions if not acted on in time.<\/p>\n\n<p class=\"wp-block-paragraph\">Stagnant water is not normal. Although many people assume it is a common situation, a well-executed roof must guarantee correct water drainage.<\/p>\n\n<p class=\"wp-block-paragraph\">When this does not happen, there is often an underlying problem related to drainage, slopes or the execution of the construction system. Many of these problems could be avoided with good initial planning and correct roof waterproofing, especially in buildings constantly exposed to rain and solar radiation.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>Why does water accumulate on a flat roof?<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Flat roofs are not completely flat.<\/p>\n\n<p class=\"wp-block-paragraph\">To ensure correct drainage, they need small slopes that direct the water towards the drains or drainage points.<\/p>\n\n<p class=\"wp-block-paragraph\">When these slopes are not well executed, water becomes trapped in different areas of the surface.<\/p>\n\n<p class=\"wp-block-paragraph\">The most common reasons are:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>insufficient pending<\/li>\n\n\n\n<li>runtime errors<\/li>\n\n\n\n<li>structural settlements<\/li>\n\n\n\n<li>poorly placed drains<\/li>\n\n\n\n<li>deformations over time<\/li>\n\n\n\n<li>waste accumulation<\/li>\n\n\n\n<li>inappropriate materials<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Many of these problems appear because an adequate technical diagnosis is not made before executing the roof or because systems are used that are not prepared to withstand current climatic demands.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>The problem can appear even in new buildings<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">One of the most surprising situations is seeing stagnant water problems in recently constructed buildings.<\/p>\n\n<p class=\"wp-block-paragraph\">This happens because many incidents are not related to the age of the roof, but to:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>project defects<\/li>\n\n\n\n<li>too fast executions<\/li>\n\n\n\n<li>lack of technical control<\/li>\n\n\n\n<li>low quality materials<\/li>\n\n\n\n<li>errors in the slopes<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">In some cases, the problem has existed since day one, but is not detected until the first significant rains.<\/p>\n\n<p class=\"wp-block-paragraph\">Many of these situations are also related to construction errors similar to those we explain in our article on <a href=\"https:\/\/impera.cat\/en\/what-is-professional-waterproofing-and-why-is-it-not-the-same-as-a-one-time-repair\/\">what professional waterproofing is<\/a> .<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>Stagnant water accelerates deterioration<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">When a roof holds water for hours or days, the materials suffer much more.<\/p>\n\n<p class=\"wp-block-paragraph\">This situation can cause:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>premature membrane degradation<\/li>\n\n\n\n<li>loss of grip<\/li>\n\n\n\n<li>interior leaks<\/li>\n\n\n\n<li>cracks<\/li>\n\n\n\n<li>appearance of mold<\/li>\n\n\n\n<li>structural deterioration<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Furthermore, during the months of intense heat, the combination of solar radiation and stagnant water further accelerates the deterioration of waterproofing systems.<\/p>\n\n<p class=\"wp-block-paragraph\">As we also explain in the article on <a href=\"https:\/\/impera.cat\/en\/extreme-heat-is-degrading-many-roofs-prematurely\/\">roof degradation due to extreme heat<\/a> , high temperatures accelerate the deterioration of materials much earlier than expected.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>The most conflict areas<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">There are particularly sensitive points within a flat roof.<\/p>\n\n<p class=\"wp-block-paragraph\">The most common are:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Drains<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">When they do not have sufficient capacity or are poorly located, the water does not drain properly.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Joints and joints<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">They are vulnerable points to constant accumulations of moisture.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Corners and perimeters<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Many leaks start at these singular points.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Sunken areas<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Small deformations can generate permanent water pockets.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">That\u2019s why it\u2019s so important to do a complete technical inspection before applying any surface repair.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>When does a small accumulation stop being normal?<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">It is common for small sheets of water to remain for a few hours after a rain.<\/p>\n\n<p class=\"wp-block-paragraph\">The problem appears when:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>the water does not disappear<\/li>\n\n\n\n<li>accumulations are constantly repeated<\/li>\n\n\n\n<li>moisture stains appear<\/li>\n\n\n\n<li>cracks are detected<\/li>\n\n\n\n<li>there is visible degradation<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">In many cases, water accumulation ends up leading to moisture and leakage problems that directly affect the interior of the building.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>The most common mistakes in flat roofs<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">At <strong>IMPERA<\/strong> , there are some errors that we repeatedly detect:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Insufficient slopes<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">It is one of the most common causes.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Lack of maintenance<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Leaves, sand or dirt can clog drains.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Makeshift repairs<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Applying superficial solutions without correcting the source of the problem only prolongs the deterioration.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Inappropriate materials<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Not all systems withstand constant exposure to water and sun equally.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Executions without technical control<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">A bad application can cause problems from the start.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>Preventive maintenance is essential<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Many incidents could be avoided with regular checks.<\/p>\n\n<p class=\"wp-block-paragraph\">Good maintenance allows:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>detect deformations<\/li>\n\n\n\n<li>check drains<\/li>\n\n\n\n<li>clean drainage points<\/li>\n\n\n\n<li>repair small cracks<\/li>\n\n\n\n<li>extend the life of the roof<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Carrying out preventive checks is much cheaper than having to face complete rehabilitation after a few years.<\/p>\n\n<p class=\"wp-block-paragraph\">As we also explain in our article on <a href=\"https:\/\/impera.cat\/en\/what-is-professional-waterproofing-and-why-is-it-not-the-same-as-a-one-time-repair\/\">what professional waterproofing is<\/a> , good execution and adequate maintenance are key to guaranteeing the durability of the system.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>The relationship between drainage and energy efficiency<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">A roof with moisture problems can also affect the energy efficiency of the building.<\/p>\n\n<p class=\"wp-block-paragraph\">When materials degrade:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>insulation capacity is lost<\/li>\n\n\n\n<li>increases thermal transmission<\/li>\n\n\n\n<li>condensation appears<\/li>\n\n\n\n<li>increases energy consumption<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Currently, many renovations combine waterproofing and thermal insulation to improve energy efficiency and better protect the building.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>Is it possible to correct the problem without lifting the entire roof?<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">It depends on each case.<\/p>\n\n<p class=\"wp-block-paragraph\">In some situations they can be applied:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>slope regrowths<\/li>\n\n\n\n<li>specific drainage improvements<\/li>\n\n\n\n<li>waterproofing reinforcements<\/li>\n\n\n\n<li>localized repairs<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">In other cases, especially when the deterioration is advanced, it is necessary to carry out a more complete rehabilitation.<\/p>\n\n<p class=\"wp-block-paragraph\">That is why a technical diagnosis is essential before deciding on any intervention.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<h4 class=\"wp-block-heading\"><strong>The importance of acting on time<\/strong><\/h4>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Many homeowners wait until interior leaks appear.<\/p>\n\n<p class=\"wp-block-paragraph\">The problem is that, when this happens, the deterioration is often already very advanced.<\/p>\n\n<p class=\"wp-block-paragraph\">Acting on time allows:<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<ul class=\"wp-block-list\">\n<li>reduce costs<\/li>\n\n\n\n<li>avoid internal damage<\/li>\n\n\n\n<li>extend the life of the roof<\/li>\n\n\n\n<li>prevent structural problems<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">A small water buildup today can become a very expensive repair in the future.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\">Stagnant water on flat roofs is not just an aesthetic issue.<\/p>\n\n<p class=\"wp-block-paragraph\">It is a sign that something is not working properly and that it can end up causing leaks, material degradation and significant structural problems.<\/p>\n\n<p class=\"wp-block-paragraph\">At <strong><a href=\"https:\/\/impera.cat\/en\/\">IMPERA<\/a><\/strong> , we analyze each roof in a personalized way to identify the real origin of the problem and apply professional waterproofing solutions adapted to each building throughout Catalonia and the Balearic Islands.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Many people think that a new roof should not present any problems for years. However, at IMPERA we are detecting more and more cases of relatively new flat roofs that accumulate water after each rain. This seemingly minor problem can end up causing leaks, premature degradation of materials and costly interventions if not acted on [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9093,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[88],"tags":[241,320,535,172,173,539,537,538,536,165],"class_list":["post-9092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en","tag-balearic-islands","tag-catalonia","tag-flat-roofs","tag-humidity","tag-leaks","tag-preventive-maintenance","tag-roof-drainage","tag-roof-rehabilitation","tag-stagnant-water","tag-waterproofing"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why many flat roofs accumulate water even when they are new - IMPERA - Impermeabilitzacions i a\u00efllaments d&#039;obra nova, Rehabilitacions<\/title>\n<meta name=\"description\" content=\"Discover why many flat roofs accumulate water even when they are new and how to avoid leaks and premature deterioration.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/impera.cat\/en\/why-many-flat-roofs-accumulate-water-even-when-they-are-new\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why many flat roofs accumulate water even when they are new - 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