{"id":17834,"date":"2026-11-08T09:39:16","date_gmt":"2026-11-08T08:39:16","guid":{"rendered":"https:\/\/ventsystems.de\/fensterantrieb-nach-glastausch\/"},"modified":"2026-11-08T09:39:16","modified_gmt":"2026-11-08T08:39:16","slug":"window-actuator-after-glass-replacement","status":"publish","type":"post","link":"https:\/\/ventsystems.de\/en\/fensterantrieb-nach-glastausch\/","title":{"rendered":"New glass, old actuator? What to check after replacing the glass"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong>In brief:<\/strong> Replacing double glazing with triple or laminated safety glass makes the sash about half as heavy again. For bottom-hung and fanlight windows, the existing actuator is usually still sufficient. With roof windows and dome lights it often gets tight \u2013 calculate beforehand.<\/p>\n\n\n<h2 class=\"wp-block-heading\">How much heavier does the sash get?<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Glass weighs about 2.5 kg per m\u00b2 and mm of glass thickness. Double glazing 4-16-4 weighs around 20 kg\/m\u00b2, triple glazing 4-14-4-14-4 around 30 kg\/m\u00b2. More under <a href=\"\/en\/dictionary\/glasaufbau\/\">Glazing build-up<\/a> and <a href=\"\/en\/dictionary\/verbundsicherheitsglas\/\">laminated safety glass<\/a>.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Is the actuator still sufficient?<\/h2>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Bottom-hung and fanlight windows in the facade:<\/strong> The actuator carries only a small part of the weight. A 250 N actuator is usually still sufficient, see <a href=\"\/en\/bottom-hung-window-triple-glazing-250-n-actuator\/\">Bottom-hung window with triple glazing<\/a>.<\/li>\n\n\n<li><strong>Roof windows and rooflights:<\/strong> The actuator lifts about half the sash weight. Here, recalculate with the <a href=\"\/en\/window-actuator-calculator\/\">Window actuator calculator<\/a> and 50 % <a href=\"\/en\/dictionary\/reserve-sicherheitszuschlag\/\">Reserve<\/a> .<\/li>\n\n\n<li><strong>Wide wings:<\/strong> From about 1.5 m width, plan two actuators.<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\">What else to check<\/h2>\n\n\n<ul class=\"wp-block-list\">\n<li>Hardware and hinges: approved for the new weight? The window manufacturer will clarify this.<\/li>\n\n\n<li><a href=\"\/en\/dictionary\/safety-stay\/\">safety stay<\/a>: still suitable for the higher weight?<\/li>\n\n\n<li>Stroke unchanged? If the sash height changes, check the stroke length.<\/li>\n<\/ul>\n\n\n<p class=\"wp-block-paragraph\">If the old actuator is too weak, see the guide <a href=\"\/en\/repair-or-replace-window-actuator\/\">Repair or replace?<\/a>. We are happy to check your case using photos via the <a href=\"\/en\/project-enquiry\/\">Project enquiry<\/a>.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n<h3 class=\"wp-block-heading\">Do I need a stronger actuator after replacing the glass?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Rarely for bottom-hung and fanlight windows, more often for roof windows and dome lights. What matters is sash weight, installation position and reserve.<\/p>\n\n\n<h3 class=\"wp-block-heading\">How can I tell that the actuator is too weak?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">The actuator runs more slowly, stops before the end position or switches off, especially in wind or cold.<\/p>","protected":false},"excerpt":{"rendered":"<p>After switching to triple or safety glass the sash gets heavier. How to check whether your existing window actuator still has enough force.<\/p>","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1958],"tags":[],"class_list":["post-17834","post","type-post","status-publish","format-standard","hentry","category-lueftung-gebaeudeautomation"],"acf":[],"_links":{"self":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/posts\/17834","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/comments?post=17834"}],"version-history":[{"count":0,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/posts\/17834\/revisions"}],"wp:attachment":[{"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/media?parent=17834"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/categories?post=17834"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ventsystems.de\/en\/wp-json\/wp\/v2\/tags?post=17834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}