{"id":3360,"date":"2026-03-05T15:58:42","date_gmt":"2026-03-05T12:58:42","guid":{"rendered":"https:\/\/ecoverti.com\/?p=3360"},"modified":"2026-04-02T12:18:39","modified_gmt":"2026-04-02T09:18:39","slug":"static-weight-of-a-planted-roof","status":"publish","type":"post","link":"https:\/\/ecoverti.com\/en\/blog\/static-weight-of-a-planted-roof\/","title":{"rendered":"Static weight of a planted roof"},"content":{"rendered":"<h2>How Much Weight Does a Planted Roof Add?<\/h2>\n<p>Weight does not only concern the substrate and the plants.<\/p>\n<p>It concerns the saturated system, that is, the weight when the substrate is fully wetted.<\/p>\n<p>Indicatively:<\/p>\n<p>Extensive system 120 \u2013 150 kg\/m\u00b2 saturated<\/p>\n<p>Semi-intensive 180 \u2013 300 kg\/m\u00b2<\/p>\n<p>Intensive (roof garden) 300 \u2013 600+ kg\/m\u00b2<\/p>\n<p>In special cases (trees, large plantings) it can exceed 800 kg\/m\u00b2<\/p>\n<p>These numbers are not theoretical. These are real loads that must be taken into account in the static study.<\/p>\n<h2>What Does a Civil Engineer Check?<\/h2>\n<p>The static check examines:<\/p>\n<ul>\n<li>The load-bearing structure (slabs, beams, columns)<\/li>\n<li>The permanent and mobile loads<\/li>\n<li>The additional load from the planted system<\/li>\n<li>The water loads in case of heavy rainfall<\/li>\n<li>Local reinforcements for zones with greater planting depth<\/li>\n<\/ul>\n<p>In many apartment buildings from the 70s\u201390s, there is the possibility of an extensive system without reinforcement. In intensive systems, however, the check is necessary.<\/p>\n<h2>Myth: \u201cThe Roof Can\u2019t Hold Up\u201d<\/h2>\n<p>In most cases, the problem is not that the roof can\u2019t hold up.<\/p>\n<p>The problem is that the load distribution has not been done correctly.<\/p>\n<p>A properly designed green roof:<\/p>\n<ul>\n<li>Distributes loads evenly<\/li>\n<li>Avoids overloads at specific points<\/li>\n<li>Takes into account the position of the pillars<\/li>\n<\/ul>\n<p>Technical detail makes the difference.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-3355\" src=\"https:\/\/ecoverti.com\/wp-content\/uploads\/2026\/03\/lightweight_roof.jpg\" alt=\"lightweight_roof\" width=\"1800\" height=\"1032\" srcset=\"https:\/\/ecoverti.com\/wp-content\/uploads\/2026\/03\/lightweight_roof.jpg 1800w, https:\/\/ecoverti.com\/wp-content\/uploads\/2026\/03\/lightweight_roof-300x172.jpg 300w, https:\/\/ecoverti.com\/wp-content\/uploads\/2026\/03\/lightweight_roof-1024x587.jpg 1024w, https:\/\/ecoverti.com\/wp-content\/uploads\/2026\/03\/lightweight_roof-768x440.jpg 768w, https:\/\/ecoverti.com\/wp-content\/uploads\/2026\/03\/lightweight_roof-1536x881.jpg 1536w\" sizes=\"(max-width: 1800px) 100vw, 1800px\" \/><\/p>\n<h2>Which Factors Increase Weight?<\/h2>\n<ol>\n<li>Deep substrate depth<\/li>\n<li>Trees with heavy roots<\/li>\n<li>Poor drainage (standing water = additional weight)<\/li>\n<li>Incorrect substrate (e.g. common soil instead of a light mix)<\/li>\n<\/ol>\n<p>The use of a specialized substrate, such as ERSM \u2013 Ecoverti Roof Substrate Mix, significantly reduces the load compared to conventional soil.<\/p>\n<h2>Why Stratigraphy Is Crucial<\/h2>\n<p>Weight is not just a matter of substrate.<\/p>\n<p>Certified systems, such as those of Optigreen, are designed to:<\/p>\n<ul>\n<li>have controlled water retention<\/li>\n<li>drain properly<\/li>\n<li>avoid supersaturation<\/li>\n<\/ul>\n<p>Poor drainage can increase the weight much more than calculated.<\/p>\n<h2>What Happens If a Static Check Is Not Done?<\/h2>\n<p>The risks include:<\/p>\n<ul>\n<li>Cracks<\/li>\n<li>Settlements<\/li>\n<li>Overloading of beams<\/li>\n<li>Waterproofing problems<\/li>\n<\/ul>\n<p>A static study is not a standard procedure. It is a safety issue.<\/p>\n<h2>Can I Do a Green Roof on an Old Apartment Building?<\/h2>\n<p>Yes \u2014 in most cases an extensive system can be applied.<\/p>\n<p>However, the final decision is made after:<\/p>\n<ul>\n<li>Checking the plans<\/li>\n<li>Inspection<\/li>\n<li>Calculation of loads<\/li>\n<\/ul>\n<p>Each building is different.<\/p>\n<p><strong>Conclusion<\/strong><\/p>\n<p>The question is not \u201ccan it withstand?\u201d<\/p>\n<p>The correct question is:<\/p>\n<p>\u201cWhich system can withstand?\u201d<\/p>\n<p>With proper design, proper load distribution and technical precision, most buildings can support some type of green roof.<\/p>\n<p>Success lies in:<\/p>\n<ul>\n<li>working with a civil engineer<\/li>\n<li>using certified systems<\/li>\n<li>applying the right technology<\/li>\n<\/ul>\n<h2>Want to Know If Your Building Can Withstand?<\/h2>\n<p>ECOVERTI works with engineers and provides technical guidance for the proper design of green roofs, with high-end systems.<\/p>\n<p>A green roof can be done safely. It just has to be done right!<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you are thinking about building a planted roof, the most critical question is not the cost. It is this: \u201cCan my roof support the weight?\u201d<br \/>\nThe correct answer requires a technical approach. Let\u2019s see what really applies.<\/p>\n","protected":false},"author":3,"featured_media":3356,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[],"class_list":["post-3360","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/posts\/3360","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/comments?post=3360"}],"version-history":[{"count":5,"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/posts\/3360\/revisions"}],"predecessor-version":[{"id":3365,"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/posts\/3360\/revisions\/3365"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/media\/3356"}],"wp:attachment":[{"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/media?parent=3360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/categories?post=3360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecoverti.com\/en\/wp-json\/wp\/v2\/tags?post=3360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}