{"id":61920,"date":"2019-08-20T10:11:21","date_gmt":"2019-08-20T09:11:21","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=61920"},"modified":"2019-08-20T10:11:21","modified_gmt":"2019-08-20T09:11:21","slug":"preventing-homes-overheating","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/preventing-homes-overheating\/61920\/","title":{"rendered":"Preventing homes from overheating"},"content":{"rendered":"<h2 class=\"p1\"><span class=\"s1\">Martin Twamley, UK technical manager at <a href=\"https:\/\/www.steico.com\/en\/\" target=\"_blank\" rel=\"noopener\">Steico<\/a>, examines the factors behind overheating in housing and how the risks can be reduced<\/span><\/h2>\n<p class=\"p1\"><span class=\"s1\">The way we design our homes is changing. We\u2019re beginning to make better use of our living spaces, converting attic rooms into bedrooms and creating top-floor living rooms with vaulted ceilings.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">There are many ways in which our homes can absorb heat from the external environment during periods of hot weather. However, too much of this solar gain can <a href=\"https:\/\/www.steico.com\/en\/steico-benefits\/heat-protection\/\" target=\"_blank\" rel=\"noopener\">cause overheating<\/a>.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Alongside windows and walls, the roof of any home is a very large solar thermal collector so it will absorb large amounts of heat during warmer spells. As heat rises, solar gain from windows and walls will rise and collect in the higher living spaces of a home. It can, therefore, be difficult to keep these spaces cool when the weather is warm.<\/span><\/p>\n<h3 class=\"p1\"><span class=\"s1\">Overheating in the UK<\/span><\/h3>\n<p class=\"p1\"><span class=\"s1\">Of course, overheating is less of a concern in the UK than in other, traditionally hotter climates. However, despite the view that the UK doesn\u2019t have hot weather, we are not immune to heatwaves \u2013 Summer 2018, for example, recorded months of consistently high temperatures which greatly influenced the internal temperatures of our buildings. Overheating is a commonly overlooked problem and its prevention should be directly addressed and accounted for in <a href=\"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/building-regulations-purpose\/56791\/\" target=\"_blank\" rel=\"noopener\">building design<\/a>.<\/span><\/p>\n<h3 class=\"p1\"><span class=\"s1\">Heat transfer from the external environment<\/span><\/h3>\n<p class=\"p1\"><span class=\"s1\">The heat your home experiences from the sun will vary throughout each day. This variation is known as \u2018periodic heat flow\u2019 and can influence a building\u2019s \u2018decrement delay\u2019 \u2013 the time lag for heat to pass through a building\u2019s envelope and influence its internal environment.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">At around midday, your home\u2019s solar gain will be at its highest. A higher decrement delay will mean that heat transfer at this point will be delayed for a longer period of time, penetrating the building\u2019s envelope at a later point in the day when the external temperature is cooler and natural ventilation of the building can take place. Generally, a 12-hour decrement delay provides the optimum solution.<\/span><\/p>\n<h3 class=\"p1\"><span class=\"s1\">Insulation materials and decrement delay<\/span><\/h3>\n<p class=\"p1\"><span class=\"s1\">Your building\u2019s insulation has two main functions \u2013 to retain heat in colder periods of weather and to keep your home cool in periods of warmer weather. How you choose to insulate your building has a large effect on its decrement delay and risk of overheating. We often choose our insulation based on a combination of their thickness and U-Values.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">For a long period of time, the UK construction industry defaulted to using synthetic insulation materials such as polystyrene or mineral wool. Due to their respective mix of density and specific heat capacities, their decrement capabilities are relatively low. This leads to thinner sections of insulation sitting on the roof of buildings, which have little thermal mass and no capacity to buffer heat transfer. This causes an increased risk of overheating.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">But as we\u2019re beginning to think more carefully about the influence our buildings can have on our physical and mental health and the health of the surrounding environment, the industry is moving to favour more natural building materials.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Natural insulation materials such as wood fibre have comparatively low levels of diffusivity (heat transfer) than synthetic materials. This means the materials can help to moderate a building\u2019s internal temperature.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">It is important to note that two materials with the same U-Values can have significantly different decrement capabilities. The density and thermal capacity of insulation materials is a vital influencer of a building\u2019s decrement delay and ultimately its risk of overheating.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Wood fibre insulation materials have an especially high density \u2013 this is key to summer heat protection as this greater mass acts as a more effective heat buffer. This buffer leads to a higher decrement delay and a \u2018phase shift\u2019 \u2013 the difference in time between the highest external temperature and the highest internal temperature.<\/span><\/p>\n<h3 class=\"p1\"><span class=\"s1\">Measuring heat transfer \u2013 thermal diffusivity<\/span><\/h3>\n<figure id=\"attachment_61928\" aria-describedby=\"caption-attachment-61928\" style=\"width: 300px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-61928\" src=\"https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-300x300.jpg\" alt=\"Overheating, building's envelope, design\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-300x300.jpg 300w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-150x150.jpg 150w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-768x768.jpg 768w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-1024x1024.jpg 1024w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-696x696.jpg 696w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-1068x1068.jpg 1068w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-420x420.jpg 420w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-1920x1920.jpg 1920w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1-610x610.jpg 610w, https:\/\/www.pbctoday.co.uk\/news\/wp-content\/uploads\/2019\/08\/STEICOhaus-with-weatherdek-1.jpg 2000w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-61928\" class=\"wp-caption-text\">STEICOhaus<\/figcaption><\/figure>\n<p class=\"p1\"><span class=\"s1\">Thermal diffusivity is the rate of the transfer of heat of a material from the warm side to the cooler side. In this scenario, the passing of heat from the external environment to the inside of the building\u2019s envelope. The thermal diffusivity of a material can be calculated by dividing its thermal conductivity (the rate at which heat passes through the material) by the specific heat capacity (the heat required to raise the temperature of the material by a given amount) multiplied by the density of the material.<\/span><\/p>\n<h3 class=\"p1\"><span class=\"s1\">Thermal diffusivity = thermal conductivity\/(specific heat capacity x density)<\/span><\/h3>\n<p class=\"p1\"><span class=\"s1\">A material with high thermal diffusivity will conduct heat quickly, causing the decrement delay to be low. Therefore, to reduce the risk of overheating, a natural material with a low thermal diffusivity such as wood fibre is more effective.<\/span><\/p>\n<h3 class=\"p1\"><span class=\"s1\">Health and comfort or overheating? The decision rests with you<\/span><\/h3>\n<p class=\"p1\"><span class=\"s1\">Overheating should be acknowledged as a common problem and planned for at the design stage of building. This shouldn\u2019t be an afterthought once a heatwave occurs.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">There are a number of reasons why a building might overheat but we can reduce the risk of this occurring by using materials that act to buffer heat and prevent its rapid transfer into the building\u2019s envelope. <a href=\"https:\/\/www.pbctoday.co.uk\/news\/modular-construction-news\/build-new-uk-homes\/61787\/\" target=\"_blank\" rel=\"noopener\">Timber frame<\/a> and lightweight structures \u2013 eg the roof on a brick or masonry home \u2013 will benefit greatly from this design approach.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">A building that carries a decreased risk of overheating is a healthy building which generates a more comfortable internal environment for its occupants. However, existing Building Regulations in the UK do not have a minimum standard for decrement delay so the decision to design with overheating in mind rests solely with you.<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\">Do you want to show your commitment to building healthy buildings? Sign up to the healthy building newsfeed today at <a href=\"http:\/\/www.steico.com\/en\/news\/campaign\/\"><span class=\"s2\">www.steico.com\/en\/news\/campaign\/<\/span><\/a><\/span><\/p>\n<p>&nbsp;<\/p>\n<p class=\"p1\"><strong><span class=\"s1\">Martin Twamley<\/span><\/strong><\/p>\n<p class=\"p1\"><span class=\"s1\">UK Technical Manager<\/span><\/p>\n<p class=\"p1\"><a href=\"https:\/\/www.steico.com\/en\/\" target=\"_blank\" rel=\"noopener\"><span class=\"s1\">Steico<\/span><\/a><\/p>\n<p class=\"p1\"><span class=\"s1\">Tel: +44 (0)1727 515 120<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\"><a href=\"http:\/\/www.steico.com\/en\/\">www.steico.com<\/a><\/span><\/p>\n<p>Twitter:\u00a0<span class=\"s1\"><a href=\"https:\/\/twitter.com\/SteicoUK\">SteicoUK<\/a><\/span><\/p>\n<div class=\"mk-custom-module-container\">\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Martin Twamley, UK technical manager at Steico, examines the factors behind overheating in housing and how the risks can be reduced.<\/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":[13038,429,279,714,33369,915],"stakeholder_rel_tag":[],"contributor_rel_tag":[],"class_list":{"0":"post-61920","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-building-control-news","7":"tag-building","8":"tag-building-control","9":"tag-environment","10":"tag-heating","11":"tag-pbc-today-august-2019","12":"tag-timber"},"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>Preventing homes from overheating<\/title>\n<meta name=\"description\" content=\"Martin Twamley, UK technical manager at Steico, examines the factors behind overheating in housing and how the risks can be reduced\" \/>\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\/preventing-homes-overheating\/61920\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Preventing homes from overheating\" \/>\n<meta property=\"og:description\" content=\"Martin Twamley, UK technical manager at Steico, examines the factors behind overheating in housing and how the risks can be reduced\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pbctoday.co.uk\/news\/building-control-news\/preventing-homes-overheating\/61920\/\" \/>\n<meta property=\"og:site_name\" content=\"Planning, Building &amp; 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