CINXE.COM
VELUX Commercial Blog | VELUX Commercial
<!DOCTYPE html> <!--[if lt IE 7]> <html class="lt-ie9 lt-ie8 lt-ie7"> <![endif]--> <!--[if IE 7]> <html class="lt-ie9 lt-ie8"> <![endif]--> <!--[if IE 8]> <html class="lt-ie9"> <![endif]--> <!--[if IE 9 ]> <html class="ie9"> <![endif]--> <!--[if gt IE 8]><!--> <html ng-app="vmsshop" class="" lang="en"> <!--<![endif]--> <head><meta charset="utf-8" /><meta name="viewport" content="width=device-width,initial-scale=1" /> <meta name="pageid" content="{CA91D8DD-5B01-47A7-9499-0EC55037775C}" /> <!--[if lt IE 9]> <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script> <![endif]--> <link rel="preload" as="style" onload="this.rel='stylesheet'" href="//afd-commercial.velux.com/style/marketing/css/vms/library/960.min.css?key=171679635228904" /> <link rel="preload" as="style" onload="this.rel='stylesheet'" href="/style/marketing/css/vms/dist/css/core.min.css" /> <link rel="stylesheet" href="//afd-commercial.velux.com/style/marketing/css/vms/dist/css/components.min.css?key=171679635941691 " /> <link rel="stylesheet" href="//afd-commercial.velux.com/script/marketing/js/common/shadowbox/shadowbox.min.css?key=171679634950321" media="print" onload="this.media='screen'"/> <link rel="stylesheet" href="//afd-commercial.velux.com/style/marketing/css/baguettebox.min.css?key=171679634161987" media="print" onload="this.media='screen'" /> <!--[if lt IE 9]> <link media="screen" rel="stylesheet" href="/style/marketing/css/lt-ie9.css" /> <![endif]--> <!-- Fix for jQuery in Preview Mode--> <link rel="shortcut icon" href="//afd-commercial.velux.com/style/marketing/images/favicon.ico?key=171679634215457" type="image/x-icon" /> <meta id="openGraphTitle" content="VELUX Commercial Blog" property="og:title" /><meta id="openGraphUrl" content="https://commercial.velux.com/blog" property="og:url" /><meta id="openGraphDescription" content="VELUX Commercial鈥檚 blog area offers inspirational and detailed information for daylight design and skylight installations within commercial buildings." property="og:description" /><meta id="openGraphImage" content="http://afd-commercial.velux.com/-/media/vms/blog/building-design/skylight-energy-performance/6555568universityoflyonfrance.jpg" property="og:image" /><meta id="openGraphType" content="blog" property="og:type" /><meta id="twitterCard" content="summary" name="twitter:card" /><meta id="twitterSite" content="@VELUXCommercial" name="twitter:site" /><meta id="twitterCreator" content="@VELUXCommercial" name="twitter:creator" /><meta id="twitterTitle" content="VELUX Commercial Blog" name="twitter:title" /><meta id="twitterImage" content="http://afd-commercial.velux.com/-/media/vms/blog/building-design/skylight-energy-performance/6555568universityoflyonfrance.jpg" name="twitter:image:src" /> <script></script><!-- here to ensure a non-blocking load still occurs in IE and Edge, even if scripts follow loadCSS in head--> <link rel="canonical" href="https://commercial.velux.com/blog" /><script type="text/javascript">var dataLayer = [{page_id:"CA91D8DD-5B01-47A7-9499-0EC55037775C" ,page_type: "GenericPage", country:"Global",language:"en-US",http_code: "200", customer_status: "not logged in"}];</script> <script>window.countryCode = 'en-US';</script> <!-- Google Tag Manager --> <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-KGQZDJB8');</script> <!-- End Google Tag Manager --> <title> VELUX Commercial Blog | VELUX Commercial </title><meta name="description" content="VELUX Commercial鈥檚 blog area offers inspirational and detailed information for daylight design and skylight installations within commercial buildings." /></head> <body class=" " style=""> <form method="post" action="/blog" id="form1"> <div class="aspNetHidden"> <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="ppcIWfGvDQS10PYAWiE4u+Uldvm20tuF/8pl2MtxrpflmZV6xkBpYAv6k5vcf3nG3S/4pn1Sax9AwLGXJTwyrKbNJRbGdDtDFHV7VE15grU=" /> </div> <div class="aspNetHidden"> <input type="hidden" name="__VIEWSTATEGENERATOR" id="__VIEWSTATEGENERATOR" value="27E92332" /> <input type="hidden" name="__VIEWSTATEENCRYPTED" id="__VIEWSTATEENCRYPTED" value="" /> <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="1Al1+W0N80pFxU9PhdAWQV8WJh0lobNXvt/4whAH+tnzx0174rL3FVellJ82nrY7VL1708V6D+DvngSH7/ovRv7bq1JvEVl7LxKXrfwYqgeHRWVqcI2JYZmb2rGxiXVioEr6TftYmiNw/25n9egHGSotdAD9TRTGGMv8kI+3pXOoovUVywK6pi4/TvhDtdxqRwdtkAxaLJ5GxrkT1N4DYA==" /> </div> <div id="main"> <div class="fixedHeaderWrapper"> <div class="service-menu "> <div class="container_12 clearfix"> <div class="grid_12"> <ul class="nav"> <nav> <ul class="level-1"> <li class="sub-menu " visible="False"> <div class=""> <a href="https://commercial.velux.com/blog" target="_self" title="Go to our VELUX Commercial Blog"> <p>Blog</p> </a> </div> <ul class="level-2"> </ul> </li> <li class="sub-menu " visible="False"> <div class=""> <a href="https://commercial.velux.com/contact-us" target="_self" > Contact </a> </div> <ul class="level-2"> </ul> </li> </ul> </nav> <nav> <li class="country-selector-menu"> <i class="far fa-globe"></i> <a style="cursor: pointer" onclick="showCountrySelectorPopup(this);"> Global </a> </li> <div id="geo_module" style="display: none;"> <div id="geo_overlay"></div> <div id="geo_content"> <div class="close"> <i class="far fa-times"></i> </div> <h2 class="blue"> Select your country site </h2> <a href="/" target="_self"> <i class="far fa-globe"></i> Global website </a> <div id="marketing_main_header_0_AlternativeMenu_marketing_country_selector_pLocalSites" class="regionList1"> <div class="countryList1"> <a href="https://commercial.velux.at/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_austria.png" alt="Flag Austria" /><span>Austria</span></a><a href="https://commercial.velux.be" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_belgium.png" alt="Flag Belgium" /><span>Belgium</span></a><a href="https://commercial.velux.hr/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_croatia.png" alt="Flag Croatia" /><span>Croatia</span></a><a href="https://commercial.velux.cz/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_czech_republic.png" alt="Flag Czech Republic" /><span>Czechia</span></a><a href="https://commercial.velux.dk/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_denmark.png" alt="Flag Denmark" /><span>Denmark</span></a><a href="https://commercial.velux.fr/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_france.png" alt="" /><span>France</span></a><a href="https://commercial.velux.de/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_germany.png" alt="Flag Germany" /><span>Germany</span></a><a href="https://commercial.velux.hu/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_hungary.png" alt="Flag Hungary" /><span>Hungary</span></a><a href="https://commercial.velux.nl/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_netherlands.png" alt="Flag Netherland" /><span>Netherlands</span></a> </div><div class="countryList1"> <a href="https://commercial.velux.no" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_norway.png" alt="Flag Norway" /><span>Norway</span></a><a href="https://commercial.velux.pl/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_poland.png" alt="Flag Poland" /><span>Poland</span></a><a href="https://commercial.velux.ro/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_romania.png" alt="Flag Romania" /><span>Romania</span></a><a href="https://commercial.velux.se/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_sweden.png" alt="Flag Sweden" /><span>Sweden</span></a><a href="https://commercial.velux.ch" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_switzerland.png" alt="Flag Switzerland" /><span>Switzerland</span></a><a href="https://commercial.velux.co.uk/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_united_kingdom.png" alt="Flag United Kingdom" /><span>United Kingdom</span></a><a href="https://www.velux.ca/en/professional/products/modular-skylights" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_canada.png" alt="Flag Canada" /><span>Canada</span></a><a href="https://commercial.veluxusa.com/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_usa.png" alt="Flag USA" /><span>United States</span></a><a href="https://commercial.velux.com/export" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/earth.png" alt="globe" /><span>Rest of the world</span></a> </div> </div> </div> </div> </nav> </ul> </div> </div> </div> <header class="big-menu"> <div class="header-bottom-bg"></div> <div class="big-menu-wrapper"> <div class="container_12 clearfix"> <div class="grid_12"> <div class="menu wrapper white"> <div class="logo"> <a href="/"> <img src="//afd-commercial.velux.com/-/media/vms/logo/velux-commercial-logo-2.png?h=50&iar=0&w=303&key=1724664251" alt="VELUX Commercial" width="303" height="50" /> </a> </div> <aside class="search show" data-full-search-url="/search?search="> <i class="velux-icon icon-search"></i> <div class="search-box"> <div tabindex="-1" class="search-field"> <input name="marketing_main_header_0$Search$SearchInput" type="text" id="marketing_main_header_0_Search_SearchInput" autocomplete="off" data-siteid="com_en" /> <i class="velux-icon icon-cross"></i> <div class="search-suggest"></div> </div> <div class="button right red"> <a> Search<i class="velux-icon icon-search-white"></i> </a> </div> <div class="search-filters" > </div> </div> </aside> <nav> <div class="nav-toggle"><i class="velux-icon icon-menu-toggle"></i></div> <ul class="level-1"> <li class="sub-menu "> <a>Products</a> <ul class="level-2"> <li class="sub-menu "> <ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/products" target="_self" > <h3>Products</h3> </a> </li> <li > <a href="https://commercial.velux.com/products/dome-rooflights-and-flat-glass-rooflights" target="_self" > Dome Rooflights and Flat Glass Rooflights </a> </li> <li > <a href="https://commercial.velux.com/products/continuous-polycarbonate-rooflights" target="_self" > Continuous Polycarbonate Rooflights </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/products/glass-roof-systems" target="_self" > <br /> Glass Roof Systems </a> </li> <li > <a href="https://commercial.velux.com/products/smoke-and-natural-ventilation" target="_self" > Smoke and Natural Ventilation </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/products/service-and-support" target="_self" > <br /> <p>Service and Support</p> </a> </li> </ul> </li></ul> </li> </ul> </li> <li class="sub-menu "> <a>Inspiration</a> <ul class="level-2"> <li class="sub-menu "> <ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/inspiration" target="_self" > <h3>Inspiration</h3> </a> </li> <li > <a href="https://commercial.velux.com/inspiration/case-study" target="_self" > Case studies </a> </li> <li > <a href="https://commercial.velux.com/inspiration/gallery" target="_self" > Gallery </a> </li> <li > <a href="https://commercial.velux.com/inspiration/news-and-events" target="_self" > News and Events </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/inspiration/daylight-visualizer" target="_self" > <br /> VELUX Daylight Visualizer </a> </li> <li > <a href="https://commercial.velux.com/inspiration/cad-bim" target="_self" > CAD / BIM </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li class="active"> <a href="https://commercial.velux.com/blog" target="_self" > <br /> Blog </a> </li> <li > <a href="https://commercial.velux.com/inspiration/ebooks" target="_self" > eBooks </a> </li> <li > </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title">Subscribe to our newsletter</li> <li > <a href="https://commercial.velux.com/inspiration/newsletter" target="_self" > <p><img alt="Modular skylights in University of Southern Denmark" src="//afd-commercial.velux.com/-/media/vms/newsletter/university-of-southern-denmar-280.jpg?h=185&w=240" style="height:185px; width:240px;" /></p> <p>Receive regular insights straight to your inbox</p> </a> </li> </ul> </li></ul> </li> </ul> </li> <li class="sub-menu "> <a>About us</a> <ul class="level-2"> <li class="sub-menu "> <ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/about" target="_self" > <h3>About us</h3> </a> </li> <li > <a href="https://commercial.velux.com/about/who-we-are" target="_self" > Who we are </a> </li> <li > <a href="https://commercial.velux.com/about/our-history" target="_self" > Our history </a> </li> <li > <a href="https://commercial.velux.com/about/management" target="_self" > Management </a> </li> <li > <a href="https://commercial.velux.com/about/locations" target="_self" > Locations </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/about/solutions-for-commercial-buildings" target="_self" > <br /> Solutions for commercial buildings </a> </li> <li > <a href="https://commercial.velux.com/contact-us" target="_self" > Contact </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/about/sustainability" target="_self" > <br /> <p><strong>Sustainability</strong></p> </a> </li> <li > <a href="https://commercial.velux.com/about/sustainability/sustainability-strategy-2030" target="_self" > Sustainability Strategy 2030 </a> </li> <li > <a href="https://commercial.velux.com/about/sustainability/daylight-solutions-for-sustainable-buildings" target="_self" > Daylight solutions for sustainable buildings </a> </li> </ul> </li></ul><ul class="level-3"><li></li></ul> </li> </ul> </li> <li class="sub-menu "> <a>Career</a> <ul class="level-2"> <li class="sub-menu "> <ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/career" target="_self" > <h3>Career</h3> </a> </li> <li > <a href="https://commercial.velux.com/career" target="_self" > Available Jobs </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/career/working-at-velux-commercial" target="_self" > <br /> Working at VELUX Commercial </a> </li> </ul> </li></ul><ul class="level-3"><li> <ul> <li class="menu-title"></li> <li > <a href="https://commercial.velux.com/career/inclusive-workplace" target="_self" > <br /> Inclusive Workplace </a> </li> </ul> </li></ul><ul class="level-3"><li></li></ul> </li> </ul> </li> </ul> </nav> </div> </div> </div> </div> </header> <header class="mobile-menu "> <div class="header-bottom-bg"></div> <div class="menu wrapper white clearfix"> <div class="logo"> <a href="/"> <img src="//afd-commercial.velux.com/-/media/vms/logo/velux-commercial-logo-mobile.png?h=104&iar=0&w=150&key=1612604649" alt="VELUX Commercial logo" width="150" height="104" /> </a> </div> <div class="menu-container"> <a href="/contact-us" class="header-menu-link"> Contact us </a> <div class="nav-toggle">Menu<i class="velux-icon icon-menu-toggle"></i></div> <nav class="is-hidden"> <aside class="language-wrapper"> </aside> <!-- Server needs to fill in url's for full search (page redirect) --> <aside class="search show" data-full-search-url="/search?search="> <div class="search-box"> <div class="search-field"> <input placeholder="Search" type="Search" /> <i class="velux-icon icon-cross"></i> </div> <div class="button right small"> <a>Search<i class="velux-icon icon-search-white"></i></a></div> </div> </aside> <div class="regular"> <ul class="open"> <li class="sub-menu "> <div class="menu-item"> Products </div> <ul class="level-2"> <li> <div class=""> <a href="https://commercial.velux.com/products" target="_self" class='menu-link'> <h2>Products</h2> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/products/dome-rooflights-and-flat-glass-rooflights" target="_self" class='menu-link'> Dome Rooflights and Flat Glass Rooflights </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/products/continuous-polycarbonate-rooflights" target="_self" class='menu-link'> Continuous Polycarbonate Rooflights </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/products/glass-roof-systems" target="_self" class='menu-link'> Glass Roof Systems </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/products/smoke-and-natural-ventilation" target="_self" class='menu-link'> <p>Additional Products</p> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/products/service-and-support" target="_self" class='menu-link'> Service and Support </a> </div> </li> </ul> </li> <li class="sub-menu "> <div class="menu-item"> About us </div> <ul class="level-2"> <li> <div class=""> <a href="https://commercial.velux.com/about" target="_self" class='menu-link'> <h3>About us</h3> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/about/who-we-are" target="_self" class='menu-link'> <p>Who we are</p> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/about/management" target="_self" class='menu-link'> <p>Management</p> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/about/locations" target="_self" class='menu-link'> Locations </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/about/solutions-for-commercial-buildings" target="_self" class='menu-link'> Solutions for commercial buildings </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/about/sustainability" target="_self" class='menu-link'> Sustainability </a> </div> </li> </ul> </li> <li class="sub-menu "> <div class="menu-item"> Inspiration </div> <ul class="level-2"> <li> <div class=""> <a href="https://commercial.velux.com/inspiration" target="_self" class='menu-link'> <h3>Inspiration</h3> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/inspiration/case-study" target="_self" class='menu-link'> <p>Case Studies</p> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/inspiration/gallery" target="_self" class='menu-link'> Gallery </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/inspiration/news-and-events" target="_self" class='menu-link'> News and Events </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/inspiration/ebooks" target="_self" class='menu-link'> <p>eBooks</p> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/inspiration/daylight-visualizer" target="_self" class='menu-link'> <p>VELUX Daylight Visualizer</p> </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/inspiration/cad-bim" target="_self" class='menu-link'> CAD/BIM </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/inspiration/newsletter" target="_self" class='menu-link'> Newsletter </a> </div> </li> </ul> </li> <li class="sub-menu "> <div class="menu-item"> Career </div> <ul class="level-2"> <li> <div class=""> <a href="https://commercial.velux.com/career" target="_self" class='menu-link'> <h3>Career</h3> </a> </div> <ul class="level-3"> <li> <div class=""> <a href="https://commercial.velux.com/career" target="_self" class='menu-link'> Available jobs </a> </div> </li> <li> <div class=""> <a href="https://commercial.velux.com/career/working-at-velux-commercial" target="_self" class='menu-link'> Working at VELUX Commercial </a> </div> </li> <li> </li> <li> <div class=""> <a href="https://commercial.velux.com/career/inclusive-workplace" target="_self" class='menu-link'> Inclusive workplace </a> </div> </li> </ul> </li> </ul> </li> <li class="country-selector-menu"> <i class="far fa-globe"></i> <a style="cursor: pointer" onclick="showCountrySelectorPopup(this);"> Global </a> </li> <div id="geo_module" style="display: none;"> <div id="geo_overlay"></div> <div id="geo_content"> <div class="close"> <i class="far fa-times"></i> </div> <h2 class="blue"> Select your country site </h2> <a href="/" target="_self"> <i class="far fa-globe"></i> Global website </a> <div id="marketing_main_header_0_MobileMenu_marketing_country_selector_pLocalSites" class="regionList1"> <div class="countryList1"> <a href="https://commercial.velux.at/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_austria.png" alt="Flag Austria" /><span>Austria</span></a><a href="https://commercial.velux.be" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_belgium.png" alt="Flag Belgium" /><span>Belgium</span></a><a href="https://commercial.velux.hr/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_croatia.png" alt="Flag Croatia" /><span>Croatia</span></a><a href="https://commercial.velux.cz/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_czech_republic.png" alt="Flag Czech Republic" /><span>Czechia</span></a><a href="https://commercial.velux.dk/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_denmark.png" alt="Flag Denmark" /><span>Denmark</span></a><a href="https://commercial.velux.fr/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_france.png" alt="" /><span>France</span></a><a href="https://commercial.velux.de/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_germany.png" alt="Flag Germany" /><span>Germany</span></a><a href="https://commercial.velux.hu/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_hungary.png" alt="Flag Hungary" /><span>Hungary</span></a><a href="https://commercial.velux.nl/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_netherlands.png" alt="Flag Netherland" /><span>Netherlands</span></a> </div><div class="countryList1"> <a href="https://commercial.velux.no" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_norway.png" alt="Flag Norway" /><span>Norway</span></a><a href="https://commercial.velux.pl/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_poland.png" alt="Flag Poland" /><span>Poland</span></a><a href="https://commercial.velux.ro/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_romania.png" alt="Flag Romania" /><span>Romania</span></a><a href="https://commercial.velux.se/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_sweden.png" alt="Flag Sweden" /><span>Sweden</span></a><a href="https://commercial.velux.ch" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_switzerland.png" alt="Flag Switzerland" /><span>Switzerland</span></a><a href="https://commercial.velux.co.uk/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_united_kingdom.png" alt="Flag United Kingdom" /><span>United Kingdom</span></a><a href="https://www.velux.ca/en/professional/products/modular-skylights" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_canada.png" alt="Flag Canada" /><span>Canada</span></a><a href="https://commercial.veluxusa.com/" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/flag_usa.png" alt="Flag USA" /><span>United States</span></a><a href="https://commercial.velux.com/export" class="country"><img src="//afd-commercial.velux.com/-/media/marketing/system/flags/earth.png" alt="globe" /><span>Rest of the world</span></a> </div> </div> </div> </div> <li id="lilanguageselector"> </li> </ul> </div> <div class="service"> <ul class="level-1 service-menu"> <li class="sub-menu"> <div class=""> <a href="https://commercial.velux.com/blog" target="_self" class='menu-link link-current'> <span style="color: #ffffff;">Blog</span> </a> </div> </li> </ul> </div> </nav> </div> </div> </header> </div> <div class="container_12 breadcrumbs"> <div class="grid_12"> <span class="breadcrumbs__element"> <a href="/">Home</a> <i class="far fa-angle-right"></i> </span> <span class="breadcrumbs__element"> Blog </span> </div> </div> <main> <div class="container_12 clearfix blog"> <div class="grid_8"> <div class="blog__header"> <h1>VELUX Commercial Blog</h1> <p><p>The VELUX Commercial blog area is where you will find information covering all aspects of daylight and ventilation design and skylight installation within industrial, commercial and public buildings.</p> <p>So that you can find information relevant to your needs, our blog posts, written using our knowledge and expertise, are split into the categories below. From sustainable building design to office ventilation strategies we guide you through the key aspects of transforming spaces into healthy and inspiring places using daylight and fresh air. </p></p> </div> <div class="blog__mobileCategories"> <div class="blog__categories"> <div class="blog__categories_title" onclick="this.classList.toggle('is-active')"> <h2>Category</h2> </div> <ul> <li > <a href="/blog/building-design"> Building Design (31) </a> </li> <li > <a href="/blog/comfort-ventilation-and-shev"> Comfort ventilation and SHEV (8) </a> </li> <li > <a href="/blog/daylight"> Daylight (19) </a> </li> <li > <a href="/blog/learning-environments"> Learning environments (15) </a> </li> <li > <a href="/blog/products"> Products (6) </a> </li> <li > <a href="/blog/regulations-and-standards"> Regulations & Standards (3) </a> </li> <li > <a href="/blog/renovation"> Renovation (3) </a> </li> </ul> </div> </div> <div class="blog__mainArticle"> <img src="//afd-commercial.velux.com/-/media/vms/blog/building-design/skylight-energy-performance/6555568universityoflyonfrance.jpg?h=425&w=700&la=en&hash=B0B6620D81B37ACA529F745296A1A5D7" alt="View of the roof of the University of Lyon" /> <div class="blog__tags"> <div class="blog__tags_inner"> Building Design </div> </div> <h2> Understanding Skylight Energy Performance: What is the U-value, the G-value and Energy Balance? </h2> <p> A building’s carbon dioxide emissions and energy use are heavily influenced by the balance of heat loss against solar gains. Therefore, when designing a building, it is helpful to understand the relation between thermal transmittance, glazing and the different levels of thermal performance. </p> <div class="button-wrapper"> <div class="button dark right"> <a href="/blog/building-design/skylight-energy-performance"> Read more <i class="velux-icon icon-chevron-right-white"></i> </a> </div> </div> </div> </div> <div class="grid_4"> <div class="blog__categories"> <div class="blog__categories_title" onclick="this.classList.toggle('is-active')"> <h2>Category</h2> </div> <ul> <li > <a href="/blog/building-design"> Building Design (31) </a> </li> <li > <a href="/blog/comfort-ventilation-and-shev"> Comfort ventilation and SHEV (8) </a> </li> <li > <a href="/blog/daylight"> Daylight (19) </a> </li> <li > <a href="/blog/learning-environments"> Learning environments (15) </a> </li> <li > <a href="/blog/products"> Products (6) </a> </li> <li > <a href="/blog/regulations-and-standards"> Regulations & Standards (3) </a> </li> <li > <a href="/blog/renovation"> Renovation (3) </a> </li> </ul> </div> </div> </div> <script src="/script/Marketing/VMS/modules/min/blog.min.js"></script> <section class="blog blog__articles"> <div class="container_12"> <div class="grid_4 blog__articles_element"> <div class="blog__articles_element_contentWrapper"> <a class="blog__articles_imageLink" href="/blog/building-design/what-is-the-u-value"> <img src="//afd-commercial.velux.com/-/media/vms/blog/building-design/what-is-the-u-value/promega-logistics-center-interior-rooflights-10155243.jpg?h=425&w=700&la=en&hash=F9F18446AC20250C4062620B72C648AA" alt="VELUX Modular Skylights Northlights at the Promega Logistics Center" /> </a> <div class="blog__articles_element_content"> <div class="blog__tags"> <a class="blog__tags_inner" href="/blog/building-design"> Building Design </a> </div> <h2> <a class="blog__articles_headerLink" href="/blog/building-design/what-is-the-u-value"> What is the U-value? </a> </h2> </div> <p> When it comes to energy efficiency in buildings, understanding the U-value of building components is crucial. U-value is a key factor in determining the thermal performance of our products, too. </p> </div> <div class="button-wrapper"> <div class="button dark right"> <a href="/blog/building-design/what-is-the-u-value"> Go to article <i class="velux-icon icon-chevron-right-white"></i> </a> </div> </div> </div> <div class="grid_4 blog__articles_element"> <div class="blog__articles_element_contentWrapper"> <a class="blog__articles_imageLink" href="/blog/products/daylight-solutions-for-swimming-pools"> <img src="//afd-commercial.velux.com/-/media/vms/blog/products/daylight-solutions-for-swimming-pools/377244_id10117729_146652-01_piscine_romont_0225.jpg?h=425&w=700&la=en&hash=3CD349685169F89015BFE8A7FA85CB38" alt="Main pool in the Romont Cultural and Sports Complex" /> </a> <div class="blog__articles_element_content"> <div class="blog__tags"> <a class="blog__tags_inner" href="/blog/products"> Products </a> </div> <h2> <a class="blog__articles_headerLink" href="/blog/products/daylight-solutions-for-swimming-pools"> Daylight Solutions for Swimming Pools </a> </h2> </div> <p> The architecture of swimming pools has many challenges with regards to the use of materials and design. With proper planning and installation, skylights can significantly enhance the aesthetics and functionality of your pool area. </p> </div> <div class="button-wrapper"> <div class="button dark right"> <a href="/blog/products/daylight-solutions-for-swimming-pools"> Go to article <i class="velux-icon icon-chevron-right-white"></i> </a> </div> </div> </div> <div class="grid_4 blog__articles_element"> <div class="blog__articles_element_contentWrapper"> <a class="blog__articles_imageLink" href="/blog/building-design/daylight-solutions-for-hotels-and-conference-centres"> <img src="//afd-commercial.velux.com/-/media/vms/blog/building-design/daylight-solutions-for-hotels-and-conference-centres/glazing-panels-bodmin-jail-hotel-526029.jpg?h=425&w=700&la=en&hash=41613F40BB3DEE9D733BB8586E3782D6" alt="VELUX Glazing Panels bring daylight to an 18th century Cornish jail to support the transformation into a luxury hotel" /> </a> <div class="blog__articles_element_content"> <div class="blog__tags"> <a class="blog__tags_inner" href="/blog/building-design"> Building Design </a> </div> <h2> <a class="blog__articles_headerLink" href="/blog/building-design/daylight-solutions-for-hotels-and-conference-centres"> Daylight solutions for hotels and conference centres </a> </h2> </div> <p> Realizing the potential of daylight in hotel and conference centre projects has several benefits. Guests and visitors can experience better time spent in more natural communal spaces. While staff have shown improved happiness and an increase in productivity. </p> </div> <div class="button-wrapper"> <div class="button dark right"> <a href="/blog/building-design/daylight-solutions-for-hotels-and-conference-centres"> Go to article <i class="velux-icon icon-chevron-right-white"></i> </a> </div> </div> </div> <div class="grid_4 blog__articles_element"> <div class="blog__articles_element_contentWrapper"> <a class="blog__articles_imageLink" href="/blog/daylight/six-building-schemes-you-can-follow-to-design-healthy-buildings"> <img src="//afd-commercial.velux.com/-/media/vms/blog/daylight/six-building-schemes-you-can-follow-to-design-healthy-buildings/hessenwaldschule-interior-with-daylight-134048.jpg?h=425&w=700&la=en&hash=F9013D84A24E14C1C58E25B59ACD31FC" alt="Hessenwaldschule with daylight" /> </a> <div class="blog__articles_element_content"> <div class="blog__tags"> <a class="blog__tags_inner" href="/blog/daylight"> Daylight </a> </div> <h2> <a class="blog__articles_headerLink" href="/blog/daylight/six-building-schemes-you-can-follow-to-design-healthy-buildings"> Six building schemes you can follow to design healthy buildings </a> </h2> </div> <p> How do you design and operate a healthy building? Answers to these questions can be found in an increasing number of methodologies and rating schemes that have seen the light around the world in recent years. They all share the ambition to strengthen the health and well-being of building users. Yet, they vary widely in terms of their overall scope, the metrics they use as proof of performance, and the weight that they put on the different phases in a building鈥檚 life cycle. The following chronological overview presents a selection of the most important and forward-looking tools, as well as their underlying methodologies. </p> </div> <div class="button-wrapper"> <div class="button dark right"> <a href="/blog/daylight/six-building-schemes-you-can-follow-to-design-healthy-buildings"> Go to article <i class="velux-icon icon-chevron-right-white"></i> </a> </div> </div> </div> <div class="grid_4 blog__articles_element"> <div class="blog__articles_element_contentWrapper"> <a class="blog__articles_imageLink" href="/blog/learning-environments/why-indoor-air-quality-is-important-and-how-to-improve-it"> <img src="//afd-commercial.velux.com/-/media/vms/blog/learning-enviroments/why-indoor-air-quality-is-important-and-how-to-improve-it/exeter-college-skylights-from-inside-and-outside-135850-135858.jpg?h=425&w=700&la=en&hash=9E4D4F8A94195304B1E43B338D7B6787" alt="xeter College featuring skylights and showing the impact of the light from the roof" /> </a> <div class="blog__articles_element_content"> <div class="blog__tags"> <a class="blog__tags_inner" href="/blog/learning-environments"> Learning environments </a> </div> <h2> <a class="blog__articles_headerLink" href="/blog/learning-environments/why-indoor-air-quality-is-important-and-how-to-improve-it"> Why indoor air quality is important and how to improve it </a> </h2> </div> <p> Did you know that well-designed classrooms have a significant influence on academic performance? Studies have found that improved physical characteristics of classrooms can boost the learning outcomes of students. </p> </div> <div class="button-wrapper"> <div class="button dark right"> <a href="/blog/learning-environments/why-indoor-air-quality-is-important-and-how-to-improve-it"> Go to article <i class="velux-icon icon-chevron-right-white"></i> </a> </div> </div> </div> <div class="grid_4 blog__articles_element"> <div class="blog__articles_element_contentWrapper"> <a class="blog__articles_imageLink" href="/blog/renovation/rebuilding-a-schools-character-with-plenty-of-daylight"> <img src="//afd-commercial.velux.com/-/media/vms/blog/products/rebuilding-a-schools-character-with-plenty-of-daylight/velux-modular-skylights-saagbaeckgymnasiet-118613-02.jpg?h=425&w=700&la=en&hash=2B49E56303D84995889663306CE10498" alt="Rooflight solution with Northlight modules. HIgh school S氓gb盲ckgymnasiet - Interior." /> </a> <div class="blog__articles_element_content"> <div class="blog__tags"> <a class="blog__tags_inner" href="/blog/renovation"> Renovation </a> </div> <h2> <a class="blog__articles_headerLink" href="/blog/renovation/rebuilding-a-schools-character-with-plenty-of-daylight"> Rebuilding a school鈥檚 character with plenty of daylight </a> </h2> </div> <p> In 2012 local authorities ended more than 10 years of talks by adopting a plan to refurbish the old vocational school in Huddinge, Sweden. The school, originally built in 1961, represented classic 60s architecture and was good quality. </p> </div> <div class="button-wrapper"> <div class="button dark right"> <a href="/blog/renovation/rebuilding-a-schools-character-with-plenty-of-daylight"> Go to article <i class="velux-icon icon-chevron-right-white"></i> </a> </div> </div> </div> </div> </section> <section class=" " id=""> <div style="background-color:#f5f5f5;" class="section-background"> </div> <div class="container_12 clearfix " id=""> <article class="grid_8 "> <div class="filterenabled spot-wrapper" > <div class="ImageHeadlineTextLink"> <div class="article-wrapper"> <h2>Guide to Daylighting and EN 17037</h2> <div class="article-content clearfix"> <h5>Free whitepaper</h5> <p>Learn more about the new European Standard EN 17037, why it matters and the impact of daylighting on building performance and occupant comfort.</p> </div> </div> <div class="button-wrapper"> <div class="button dark right"> <a href="https://commercial.velux.com/inspiration/ebooks/guide-to-daylighting-and-en17037" target="_self" > <p>Read whitepaper</p> <!-- <i class="velux-icon icon-chevron-right-white"></i> --> <i class="far fa-chevron-right"></i> </a> </div> </div> </div> </div> </article> <article class="grid_4 "> <div class="filterenabled spot-wrapper" > <div class="image-wrapper image-spot"> <img data-original="//afd-commercial.velux.com/-/media/vms/inspiration/e-books/guide-to-daylighting-and-en-17037/guide-to-daylighting-and-en-17037-ebook-in-screen-eng.png?h=441&iar=0&w=540&cc=grid_4&key=158835358808726" alt="eBook: Guide to Daylighting and EN 17037" cc="grid_4" class=" lazy" /> </div> </div> </article> </div> </section> </main> </div> <footer> <div class="footer-tabs"> <div class="container_12 clearfix"> <div class="grid_12"> <div class="tab-title active "> Products</div> </div> </div> </div> <!-- Active class should be removed when JavaScript has been added --> <nav class="active "> <div class="container_12 clearfix"> <!-- Repeater for FooterLinkSections --> <ul class="footer-nav-1"> <li class="menu-title"> Products </li> <li class="menu-item"> <a href="https://commercial.velux.com/products/dome-rooflights-and-flat-glass-rooflights" target="_self" >Dome Rooflights and Flat Glass Rooflights</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/products/continuous-polycarbonate-rooflights" target="_self" >Continuous Polycarbonate Rooflights</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/products/glass-roof-systems" target="_self" >Glass Roof Systems</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/products/smoke-and-natural-ventilation" target="_self" >Smoke and Natural Ventilation</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/products/service-and-support" target="_self" >Service and Support</a> </li> </ul> <ul class="footer-nav-2"> <li class="menu-title"> Inspiration </li> <li class="menu-item"> <a href="https://commercial.velux.com/inspiration/case-study" target="_self" >Case Studies</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/inspiration/gallery" target="_self" >Gallery</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/inspiration/ebooks" target="_self" >eBooks</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/inspiration/daylight-visualizer" target="_self" >VELUX Daylight Visualizer</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/inspiration/cad-bim" target="_self" >CAD/BIM</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/blog" target="_self" >Blog</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/inspiration/news-and-events" target="_self" >News and Events</a> </li> </ul> <ul class="footer-nav-3"> <li class="menu-title"> About </li> <li class="menu-item"> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/management" target="_self" >Management</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/locations" target="_self" >Locations</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/solutions-for-commercial-buildings" target="_self" >Solutions for commercial buildings</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/sustainability/sustainability-strategy-2030" target="_self" >Sustainability</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/privacy-policy" target="_self" >Privacy policy</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/legal-notice" target="_self" >Legal Notice</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/cookie-policies" target="_self" >Cookie Policy</a> </li> <li class="menu-item"> </li> <li class="menu-item"> <a href="https://commercial.velux.com/about/other-velux-sites" target="_self" >Other VELUX websites</a> </li> <li class="menu-item"> <a href="//afd-commercial.velux.com/-/media/vms/about/modern-slavery-act/modernslaverystatement2024.pdf" target="_self" media>Modern Slavery Act Statement</a> </li> <li class="menu-item"> <a href="https://velux.whistleblowernetwork.net/WebPages/Public/FrontPages/Default.aspx" target="_self" external><br /> <a href="https://velux.whistleblowernetwork.net/WebPages/Public/FrontPages/Default.aspx">Report Concern (Whistle-blower)</a></a> </li> </ul> <ul class="footer-nav-4"> <li class="menu-title"> Career </li> <li class="menu-item"> <a href="https://commercial.velux.com/career" target="_self" >Available jobs</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/career/working-at-velux-commercial" target="_self" >Working at VELUX Commercial</a> </li> <li class="menu-item"> <a href="https://commercial.velux.com/career/inclusive-workplace" target="_self" >Inclusive workplace</a> </li> </ul> <!-- Markup for FooterCustomSection --> <ul class="footer-nav-5"> <li class="menu-title"> Contact </li> <div class="address"> <span style="font-size: 14px; line-height: 3rem; color: #d5eaf9;"> VELUX A/S<br /> VELUX Commercial<br /> Ådalsvej 99<br /> 2970 Hørsholm, Denmark<br /> <br /> Find us here:</span> <p> </p> </div> <li> <div class="social-icons"> <a target="_blank" href="https://www.linkedin.com/showcase/velux-commercial/"> <img alt="LinkedIn logo" alt="" src="//afd-commercial.velux.com/-/media/marketing/master/social icons/linkedin.png?la=en&h=42&w=42" style="height: 42px; width: 42px; margin-top: 7px; margin-right: 15px; align: left; margin-left: 0px;"></a> <a target="_blank" href="https://www.youtube.com/channel/UCPWkgm34KPDgSnYK4-6_hrg"> <img alt="YouTube logo" alt="" src="//afd-commercial.velux.com/-/media/vms/logo/social-media/youtube.png?la=en&h=42&w=42" style="height: 42px; width: 42px; margin-top: 7px; margin-right: 15px;"></a> <a target="_blank" href="https://www.instagram.com/veluxcommercial/"> <img alt="Instagram logo" alt="" src="//afd-commercial.velux.com/-/media/vms/logo/social-media/instagram.png?la=en&h=42&w=42" style="height: 42px; width: 42px; margin-top: 7px; margin-right: 15px;"></a> </div> </li> </ul> </div> </nav> <div class="payoff clearfix"> <div class="container_12"> <div class="grid_6 prefix_6"> </div> </div> </div> </footer> <div id="hdDevicesContainer"><input type="hidden" name="Default" id="Default" value="default" /><input type="hidden" name="Mobile" id="Mobile" value="767" /><input type="hidden" name="Tablet" id="Tablet" value="959" /><input type="hidden" name="Desktop" id="Desktop" value="960" /></div></form> <script defer src="//afd-commercial.velux.com/script/marketing/vms/library/min/baguettebox.min.js?key=171679635042173"></script> <script src="//code.jquery.com/jquery-3.6.3.min.js"></script> <script src="//afd-commercial.velux.com/script/marketing/js/min/common.min.js?key=171679634579729"></script> <script defer src="//afd-commercial.velux.com/script/marketing/vms/dist/js/vmscomponents.js?key=171679635041862"></script> <script defer src="//afd-commercial.velux.com/script/globals/vanillalazyload.js?key=171679633917368"></script> <script defer src="//afd-commercial.velux.com/script/marketing/js/min/initilaizejavascriptcomponents.min.js?key=171679634582487"></script> <script async src="https://kit.fontawesome.com/686777ed6d.js" crossorigin="anonymous"></script> <input type="hidden" value="en"> <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "Article", "headline": "Understanding Skylight Energy Performance: What is the U-value, the G-value and Energy Balance?", "image": "//afd-commercial.velux.com/-/media/vms/blog/building-design/skylight-energy-performance/6555568universityoflyonfrance.jpg", "datePublished": "2023-04-14T05:52:56+00:00", //FORMAT: 2015-02-05T08:00:00+08:00 "publisher": { "@type": "Organization", "name": "VELUX Commercial", "contactPoint": [{ "@type": "ContactPoint", "telephone": "", "email": "", "contactType": "" } ], "logo": { "@type": "ImageObject", "url": "//afd-commercial.velux.com/-/media/vms/logo/velux-commercial-logo-2.png" }, "url": "https://commercial.velux.com", // https://commercial.velux.xx "sameAs": [ "https://www.linkedin.com/showcase/velux-commercial/", "https://www.youtube.com/channel/UCPWkgm34KPDgSnYK4-6_hrg", "https://www.instagram.com/veluxcommercial/" ] }, "author": { "@type": "Organization", "name": "VELUX Commercial", "url": "" // About Us Page } } </script> </body> </html>