{"id":73236,"date":"2020-03-13T10:54:25","date_gmt":"2020-03-13T10:54:25","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=73236"},"modified":"2020-03-13T10:54:25","modified_gmt":"2020-03-13T10:54:25","slug":"secondary-glazing-rules-regulations","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/secondary-glazing-rules-regulations\/73236\/","title":{"rendered":"What are the rules and regulations of secondary glazing?"},"content":{"rendered":"<h2><a href=\"https:\/\/www.selectaglaze.co.uk\/\" target=\"_blank\" rel=\"noopener noreferrer\">Selectaglaze<\/a> has gained a reputation as a leading secondary glazing specialist, creating sensitive designs with low visual impact, here, they explain the rules and regulations<\/h2>\n<p>Secondary glazing is a discreet retrofit adaptation for heritage or Listed buildings to improve thermal performance, provide <a href=\"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/acoustic-insulation\/56349\/\" target=\"_blank\" rel=\"noopener noreferrer\">acoustic insulation<\/a> and security to original windows which cannot be changed.<\/p>\n<h3>Listed building consent<\/h3>\n<p>Listed building consent (LBC) is required for any alteration affecting the character of the building \u2013 it is a criminal offence to undertake works without it. Generally, secondary glazing is accepted as a fully reversible treatment and widely accepted as the best method of improving historic window performance.<\/p>\n<h3>Energy efficiency \u2013 approved document L<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-73243 alignright\" src=\"https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2020\/03\/Picture-2.jpg\" alt=\"Selectaglaze, secondary glazing\" width=\"253\" height=\"376\" \/>Although secondary glazing is not specifically mentioned in the document, the regulations acknowledge the sensitivity in raising performance standards in heritage buildings. Therefore, original single glazed windows can be retained and secondary windows with low emissivity glass retrofitted.<\/p>\n<p>A single glazed traditional window will typically achieve a U-value of around 4.7. However, if you add secondary glazing with low emissivity glass, it can be reduced to 1.8 &#8211; 1.95. This can make a significant contribution to achieving good <a href=\"https:\/\/www.breeam.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">BREEAM<\/a> or EPC ratings in refurbishment and retrofit projects.<\/p>\n<h3>Acoustic insulation<\/h3>\n<p>Secondary glazing is the best method of <a href=\"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/selectaglaze-comet-hotel\/68579\/\" target=\"_blank\" rel=\"noopener noreferrer\">noise insulation<\/a>, as it creates a cavity from the primary window which reduces resonance and reverberation, making the interior quieter.<\/p>\n<p>There are a number of regulations that should be considered, although secondary glazing is not specifically governed by them; BS 8233:1999 \u2018Sound Insulation and Noise Reduction for Buildings\u2019, Planning and Policy Guidance 24, Building Bulletin 93: Acoustic Design in schools and <a href=\"https:\/\/www.who.int\/\" target=\"_blank\" rel=\"noopener noreferrer\">The World Health Organisation\u2019s<\/a> (WHO) Guidelines for Community Noise.<\/p>\n<p>The WHO states that 30-35dB is an acceptable noise level for bedrooms. Putting this into context; traffic noise levels can reach 80dB. If you have original single glazed windows, then they will generally achieve a 20dB reduction. Replace these with new double glazing and the noise would be reduced to around 34dB. If you retain the original windows and add glazing with a 150mm cavity, then a 45dB reduction can be achieved.<\/p>\n<h3>Security \u2013 approved document Q<\/h3>\n<p>Although there are no specific requirements for secondary glazing within Part Q, there is a growing need in \u2018change of use\u2019 projects to meet security requirements. If a building has been deemed vulnerable following assessment by a security consultant, then specialist glazing products can be fitted. These range from Secured by Design (PAS24), enhanced physical security (LPS1175), right through to bomb blast mitigating units.<\/p>\n<h3>Safety \u2013 approved document K<\/h3>\n<p>There are two principle areas within Part K for secondary glazing.<\/p>\n<p><strong>K4<\/strong> \u2013 Protection against impact with glazing: Must be met whenever secondary glazing is introduced.<\/p>\n<p><strong>K2<\/strong> \u2013 Protection from falling: Can be met with the addition of secondary glazing when a \u2018material change of use\u2019 demands that performance of primary windows is improved.<\/p>\n<h3>Fire \u2013 approved document B<\/h3>\n<p>Under B1 means of warning and escape: Secondary glazing can be used on a designated fire escape window as long as it meets the opening limitations specified or does not make the situation any more unsatisfactory. Additionally, fire retardant secondary glazing can be used to treat existing openings which need to be upgraded to provide a protected escape route.<\/p>\n<p>No matter the benefit required of the glazing, always ask to see performance data and test certificates to substantiate the provider\u2019s claims. Check sample sizes that were tested \u2013 as they can sometimes skew the resulting data.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.selectaglaze.co.uk\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Selectaglaze<\/strong><\/a><\/p>\n<div class=\"mk-custom-module-container\">\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Selectaglaze has gained a reputation as a leading secondary glazing specialist, creating sensitive designs with low visual impact, here, they explain the rules and regulations.<\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[306],"tags":[429,568,430,673,110,23907,432,675,586,35249,753,13176],"stakeholder_rel_tag":[172516],"contributor_rel_tag":[],"class_list":{"0":"post-73236","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-building-control-news","7":"tag-building-control","8":"tag-building-regulations","9":"tag-energy-efficiency","10":"tag-energy","11":"tag-fire-safety-management","12":"tag-glazing","13":"tag-health-safety","14":"tag-heritage","15":"tag-insulation","16":"tag-noise-reduction","17":"tag-safety","18":"tag-sh-selectaglaze","19":"stakeholder_rel_tag-selectaglaze"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v26.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What are the rules and regulations of secondary glazing?<\/title>\n<meta name=\"description\" content=\"Selectaglaze gained a reputation as a secondary glazing specialist, creating sensitive designs with low visual impact, they explain rules and regulations\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/secondary-glazing-rules-regulations\/73236\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What are the rules and regulations of secondary glazing?\" \/>\n<meta property=\"og:description\" content=\"Selectaglaze gained a reputation as a secondary glazing specialist, creating sensitive designs with low visual impact, they explain rules and regulations\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/secondary-glazing-rules-regulations\/73236\/\" \/>\n<meta property=\"og:site_name\" content=\"Planning, Building &amp; 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