{"id":278124,"date":"2022-03-02T13:15:15","date_gmt":"2022-03-02T13:15:15","guid":{"rendered":"https:\/\/www.sanier.pl\/bw-hasla\/hydroizolacja-fundamentu-najczestsze-bledy\/"},"modified":"2025-02-13T07:51:43","modified_gmt":"2025-02-13T07:51:43","slug":"hydroizolacja-fundamentu-najczestsze-bledy","status":"publish","type":"knowledgebase","link":"https:\/\/www.sanier.pl\/en\/bw-hasla\/hydroizolacja-fundamentu-najczestsze-bledy\/","title":{"rendered":"Foundation Waterproofing \u2013 What Are the Most Common Mistakes?"},"content":{"rendered":"<p>[vc_row][vc_column][vc_column_text]<\/p>\n<h2>Foundation Waterproofing \u2013 What Are the Most Common Mistakes?<\/h2>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<h3>A <strong>properly executed foundation waterproofing system ensures long-term protection<\/strong>.<\/h3>\n<p>[\/vc_column_text][vc_column_text]It is best to invest in quality waterproofing at the construction stage. The cost of repairing a damaged or poorly applied waterproofing system is much higher than the cost of using high-quality materials and specialized labor. This is not an area where cutting costs is advisable.[\/vc_column_text][vc_column_text]By the time you notice <strong>damp walls, lifting parquet and tiles, or mold growth<\/strong>, it is often <strong>too late<\/strong>. In many cases, only the symptoms can be treated, not the root cause (since water can migrate from different areas of the structure).[\/vc_column_text][vc_column_text]It is difficult to predict future <strong>risks for a building\u2019s foundation<\/strong>. Even the construction of nearby residential developments <strong>can disrupt groundwater levels<\/strong>, potentially leading to <strong>increased water pressure on the foundation<\/strong>.[\/vc_column_text][vc_column_text]<\/p>\n<h3><strong>Common Mistakes in Foundation Waterproofing<\/strong><\/h3>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<h4><strong>Buildings Without Basements<\/strong><\/h4>\n<h4><strong>Mistakes:<\/strong><\/h4>\n<ul>\n<li><strong>Foundation wall placed directly on the footing<\/strong>\n<ul>\n<li><em>Mistake:<\/em> Not installing <strong>fillets (fascia strips)<\/strong> at the connection between the <strong>footing and the foundation wall<\/strong>.<\/li>\n<li><em>Solution:<\/em> Fillets must be applied both <strong>inside and outside<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Poorly prepared substrate<\/strong>\n<ul>\n<li><em>Mistake:<\/em> Not properly <strong>leveling<\/strong> the surface before applying waterproofing.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Sharp edges not rounded<\/strong>\n<ul>\n<li><em>Mistake:<\/em> Leaving sharp <strong>corners and junctions<\/strong> at <strong>wall-to-wall<\/strong> or <strong>footing-to-wall<\/strong> connections.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4><strong>Recommendations &amp; Tips:<\/strong><\/h4>\n<p><strong>Fillets inside the foundation<\/strong> should be applied at <strong>footing-to-wall connections<\/strong> and <strong>wall-to-wall joints<\/strong> to ensure <strong>seamless vertical surfaces<\/strong>.<\/p>\n<p><strong>Use waterproofing slurries instead of roofing felt (bituminous membranes)<\/strong>.<\/p>\n<ul>\n<li>Moisture barriers should be made with <strong>mineral-based sealing slurries<\/strong>, as <strong>bituminous membranes cannot create a seamless barrier<\/strong>.<\/li>\n<\/ul>\n<p><strong>Apply external waterproofing<\/strong> only <strong>after<\/strong> the structural walls are completed.<\/p>\n<ul>\n<li>The waterproofing <strong>must extend at least 30 cm up the external walls<\/strong> (<em>Sanier recommends 50 cm<\/em>).<\/li>\n<li>If the waterproofing is applied too low, <strong>an additional perimeter waterproofing band<\/strong> must be installed to <strong>connect the foundation waterproofing with the wall waterproofing<\/strong>.<\/li>\n<\/ul>\n<p>[\/vc_column_text][vc_column_text]<\/p>\n<h4><strong>Buildings with Basements<\/strong><\/h4>\n<h5><strong>Mistakes:<\/strong><\/h5>\n<ul>\n<li><strong>Poorly prepared substrate<\/strong>\n<ul>\n<li><em>Mistake:<\/em> Not properly <strong>leveling<\/strong> the surface before applying waterproofing.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Sharp edges not rounded<\/strong>\n<ul>\n<li><em>Mistake:<\/em> Leaving sharp <strong>corners and junctions<\/strong> at <strong>wall-to-wall<\/strong> or <strong>footing-to-wall<\/strong> connections.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4><strong>Recommendations &amp; Tips:<\/strong><\/h4>\n<p><strong>Install waterproofing between the lean concrete layer and the base slab<\/strong>.<\/p>\n<ul>\n<li>Avoid using <strong>roofing felt (bituminous membranes) or construction foil<\/strong> for waterproofing!<\/li>\n<li>If leaks occur, water can <strong>spread underneath<\/strong> the felt or foil, causing long-term damage.<\/li>\n<li>Construction foil <strong>is not a waterproofing material<\/strong> and should never be used for this purpose.<\/li>\n<\/ul>\n<p><strong>If the basement extends under the entire building<\/strong>, only <strong>external waterproofing (perimeter waterproofing)<\/strong> is necessary.<\/p>\n<ul>\n<li><em>Mistake:<\/em> Applying <strong>internal vertical waterproofing on basement walls<\/strong>\u2014this is unnecessary when a full external waterproofing system is in place.<\/li>\n<\/ul>\n<p>[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text]<\/p>\n<h4><strong>Need More Information?<\/strong><\/h4>\n<p>For <strong>detailed guidance<\/strong> on waterproofing processes, check out our waterproofing guide:<\/p>\n<p><strong><a href=\"https:\/\/www.sanier.pl\/poradniki_sanier\/hydroizolacja-poradnik-cz1\/\" rel=\"noopener\">Part 1 \u2013 Click Here<\/a><\/strong><br \/>\n<strong><a href=\"https:\/\/www.sanier.pl\/poradniki_sanier\/hydroizolacja-poradnik-dla-kazdego-cz2-ebook\/\" rel=\"noopener\">Part 2 \u2013 Click Here<\/a><\/strong><\/p>\n<p><strong>Got Questions?<\/strong> Our team of experts is happy to help!<br \/>\n<strong>Call us at (+48) 12 307 24 98<\/strong> for professional advice.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"author":55,"featured_media":270884,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","categories":[873],"tags":[],"class_list":["post-278124","knowledgebase","type-knowledgebase","status-publish","has-post-thumbnail","hentry","category-knowledge-base"],"_links":{"self":[{"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/knowledgebase\/278124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/knowledgebase"}],"about":[{"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/types\/knowledgebase"}],"author":[{"embeddable":true,"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/comments?post=278124"}],"version-history":[{"count":0,"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/knowledgebase\/278124\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/media\/270884"}],"wp:attachment":[{"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/media?parent=278124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/categories?post=278124"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sanier.pl\/en\/wp-json\/wp\/v2\/tags?post=278124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}