{"id":118,"date":"2013-02-18T13:20:01","date_gmt":"2013-02-18T13:20:01","guid":{"rendered":"http:\/\/www.newmdlocal.com\/blog\/?p=118"},"modified":"2017-10-23T16:46:35","modified_gmt":"2017-10-23T15:46:35","slug":"u-values-for-replacement-external-doors-explained","status":"publish","type":"post","link":"https:\/\/www.modern-doors.co.uk\/blog\/u-values-for-replacement-external-doors-explained\/","title":{"rendered":"U Values For Replacement External Doors Explained"},"content":{"rendered":"<p><a title=\"Modern Doors\" href=\"https:\/\/www.modern-doors.co.uk\" target=\"_blank\">Modern Doors<\/a> clarifies the subject of U-Values for external doors.<\/p>\n<p>\u2014<\/p>\n<p>The subject of U-Values \u2013 particularly in relation to replacement doors, home extensions or new build projects \u2013 is a source of significant confusion and one that we, at Modern Doors, have almost daily experience of dealing with.\u00a0 Here we will take a look in a little more depth at this term and, hopefully, provide some clarity regarding the latest Building Regulation documentation.<\/p>\n<p>The simple definition of a U-Value is the measure of the rate of heat loss through a material.\u00a0 It is clear that this is of central importance in home improvement and construction \u2013 particularly in the modern building industry \u2013 as one seeks to achieve the lowest U-Value possible as this will mean that less heat is escaping and therefore the home is more energy efficient.\u00a0 Naturally, <a title=\"External Doors, Front Doors\" href=\"https:\/\/www.modern-doors.co.uk\/external-doors.html\" target=\"_blank\">external doors<\/a> represent a significant area of potential heat loss (and internal doors also represent important heat buffers) and, as such, the design and quality of your replacement doors are vital.<\/p>\n<p>However, whilst defining it is relatively simple, the U-Value calculation itself is rather more complex.\u00a0 It is measured by the amount of heat lost through one square metre of the material for every degree difference in temperature either side of the material \u2013 a measurement that requires time, experience and appropriate equipment to capture. \u00a0\u00a0Fortunately, door manufacturers and suppliers should be able to confirm the approximate U-Value on all products in their range as these will have been established through formal testing earlier in their development.<\/p>\n<p>The latest information has been made available from Building Regulations Documents L1A (New Dwellings) 2010 &amp; L1B (Existing Dwellings) 2010:<\/p>\n<table width=\"677\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"129\">Fitting<\/td>\n<td valign=\"top\" width=\"193\">Standard for new fittings in new dwellings<\/td>\n<td valign=\"top\" width=\"182\">Standard for replacement fittings in an existing dwelling<\/td>\n<td valign=\"top\" width=\"172\">Standard for new fittings to an extension in an existing dwelling<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"129\">Doors with greater than 50% of their internal face area glazed<\/td>\n<td valign=\"top\" width=\"193\">2.0W\/m<sup>2<\/sup>K<\/td>\n<td valign=\"top\" width=\"182\">1.8W\/m<sup>2<\/sup>K (or exempt if fitted into existing door frame)<\/td>\n<td valign=\"top\" width=\"172\">1.8W\/m<sup>2<\/sup>K (or exempt if fitted into existing door frame)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"129\">Other doors<\/td>\n<td valign=\"top\" width=\"193\">1.8W\/m<sup>2<\/sup>K<\/td>\n<td valign=\"top\" width=\"182\">1.8W\/m<sup>2<\/sup>K (or exempt if fitted into existing door frame)<\/td>\n<td valign=\"top\" width=\"172\">1.8W\/m<sup>2<\/sup>K (or exempt if fitted into existing door frame)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>To summarise the information for you, when are fitting internal doors in an existing dwelling, you should be seeking a U-Value of no more than 1.8W\/m<sup>2<\/sup>K (assuming you are installing the new door into a new door-frame).\u00a0 However, where a new build is concerned, the customer must establish their own U-Value and it cannot exceed 2.0W\/m<sup>2<\/sup>K.<\/p>\n<p>At Modern Doors, the complexities of modern building regulations are a regular backdrop to our work and, as such, we understand better than most how confusing the whole area can become \u2013 that\u2019s why, when it comes to the design, fitting and maintenance of both external and internal doors, we are always pleased to provide advice and support \u2013 please feel free to contact us today with your queries.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Modern Doors clarifies the subject of U-Values for external doors. \u2014 The subject of U-Values \u2013 particularly in relation to replacement doors, home extensions or new build projects \u2013 is a source of significant confusion and one that we, at Modern Doors, have almost daily experience of dealing with.\u00a0 Here we will take a look [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[9,16],"class_list":["post-118","post","type-post","status-publish","format-standard","hentry","category-external-doors","tag-external-doors","tag-modern-doors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>U Values For Replacement External Doors Explained - Modern Doors<\/title>\n<meta name=\"description\" content=\"Article explaining u-values and their requirements in replacement external wooden doors. U-values calculations and Part L 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.modern-doors.co.uk\/blog\/u-values-for-replacement-external-doors-explained\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"U Values For Replacement External Doors Explained - Modern Doors\" \/>\n<meta property=\"og:description\" content=\"Article explaining u-values and their requirements in replacement external wooden doors. 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