{"id":107473,"date":"2022-03-11T11:04:56","date_gmt":"2022-03-11T11:04:56","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=107473"},"modified":"2022-03-11T11:04:56","modified_gmt":"2022-03-11T11:04:56","slug":"building-renovations-housing-targets","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/planning-construction-news\/building-renovations-housing-targets\/107473\/","title":{"rendered":"Can building renovations help meet housing targets?"},"content":{"rendered":"<div>\n<h2><span style=\"color: #111111; font-family: Roboto, sans-serif; font-size: 27px;\">Victor Chirilas, director of ground engineering experts, <\/span><a style=\"font-family: Roboto, sans-serif; font-size: 27px;\" href=\"https:\/\/mainmark.co.uk\/technology\/teretek\/\" target=\"_blank\" rel=\"noopener noreferrer\">Mainmark<\/a><span style=\"color: #111111; font-family: Roboto, sans-serif; font-size: 27px;\">, explores how building renovations can help meet housing targets, whilst addressing the risks involved and how to solve them<\/span><\/h2>\n<\/div>\n<div>\n<p><span lang=\"en-GB\" style=\"font-family: Verdana, Geneva, sans-serif; font-size: 15px; color: #222222;\">In 2015, the UK government announced the ambitious goal of delivering one million &#8216;net additions&#8217; to the housing stock by 2020. This has led to an exponential growth in new builds and property conversions. Currently, the new housing supply is lower than the government\u2019s ambition of 300,000 new homes per year; only <\/span><a style=\"font-family: Verdana, Geneva, sans-serif; font-size: 15px;\" href=\"https:\/\/www.gov.uk\/government\/statistics\/housing-supply-net-additional-dwellings-england-2020-to-2021\" target=\"_blank\" rel=\"noopener noreferrer\" data-auth=\"NotApplicable\" data-linkindex=\"0\"><span lang=\"en-GB\">216,000 new homes were supplied in 2020\/21<\/span><\/a><span lang=\"en-GB\" style=\"font-family: Verdana, Geneva, sans-serif; font-size: 15px; color: #222222;\">. Whilst this is in part due to disruption to housebuilding caused by Covid-19 in early 2020, it\u2019s clear from this data that more\u00a0<\/span><span lang=\"en-GB\" style=\"font-family: Verdana, Geneva, sans-serif; font-size: 15px; color: #222222;\">housing needs to be created quickly.\u00a0<\/span><span style=\"font-family: Verdana, Geneva, sans-serif; font-size: 15px; color: #222222;\">\u00a0<\/span><\/p>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">With <a href=\"https:\/\/www.pbctoday.co.uk\/news\/health-safety-news\/construction-site-safety-rules-regulations-inclement-weather\/107207\/\" target=\"_blank\" rel=\"noopener noreferrer\">extreme weather<\/a> in the UK becoming more common, new buildings must be able to withstand the elements to prevent foundation damage and subsidence. Building as quickly and as cheaply as possible, however, can increase the <a href=\"https:\/\/www.pbctoday.co.uk\/news\/stakeholders\/building-defects-insurance\/34428\/\" target=\"_blank\" rel=\"noopener noreferrer\">risk of structural issues<\/a> and cause longer-term problems. It\u2019s common for new buildings to settle in their first few years and this shouldn\u2019t be a cause for alarm but if the movement is severe or ongoing, it may be caused by subsidence.\u00a0<\/span><\/p>\n<\/div>\n<div>\n<h3><span lang=\"en-GB\">Conversions and building renovations<\/span><\/h3>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">Alongside the need for high-density new developments across the UK, if done correctly, building renovations can be a much quicker, more environmentally sensitive way to provide new homes. Starting with the foundations and ensuring they are sound is the first step to preserving a <a href=\"https:\/\/www.pbctoday.co.uk\/news\/bim-news\/sustainable-construction-lifecycle\/104048\/\" target=\"_blank\" rel=\"noopener noreferrer\">building\u2019s life<\/a> and will allow for safe and reliable refurbishments to take place. If this is not addressed first, upgrading expensive interior fixtures like doors and windows can become an issue, should the property subside. <\/span><\/p>\n<\/div>\n<div>\n<p><span lang=\"en-AU\">Cracks in walls,\u00a0close to doorways and windows,\u00a0and sloping or sinking floors are\u00a0often\u00a0early indicators that a building has foundation problems that could\u00a0be the result of\u00a0subsidence. This can happen for many reasons, including neighbouring construction affecting a building\u2019s integrity or when soil becomes too wet or too dry, which will affect the foundation structure.\u00a0<\/span><\/p>\n<\/div>\n<div>\n<p><span lang=\"en-AU\">The process of underpinning is the most common method to fix subsidence as it strengthens a <a href=\"https:\/\/www.pbctoday.co.uk\/news\/planning-construction-news\/foundations-trees-clay\/89579\/\" target=\"_blank\" rel=\"noopener noreferrer\">building\u2019s foundations<\/a>\u00a0but doesn\u2019t always address the soil conditions. The two most popular methods of resolving foundation issues are traditional concrete underpinning and modern\u00a0geopolymer\u00a0resin injection. Both are proven methods, yet they\u00a0involve\u00a0very\u00a0different\u00a0procedures.\u00a0<\/span><\/p>\n<h3>How to resolve foundation issues during building renovations<\/h3>\n<div>\n<p>When assessing the foundations in an existing structure, understanding the soil type is critical. In the UK the most common soil types are clay, sand and silt, fill and organic:<\/p>\n<\/div>\n<\/div>\n<div>\n<h4><span lang=\"en-GB\">Clays<\/span><\/h4>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">Reactive clay soil swells when wet and shrinks when dry causing subsidence in drier conditions, or heave in wetter areas.<\/span><\/p>\n<\/div>\n<div>\n<h4><span lang=\"en-GB\">Sand and silt<\/span><\/h4>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">Structures on sand and silt soils often experience settlement caused by flowing groundwater, a natural underground watercourse,\u00a0a leaking\u00a0sewer\u00a0or stormwater pipe, causing washout.<\/span><\/p>\n<\/div>\n<div>\n<h4><span lang=\"en-GB\">Fill<\/span><\/h4>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">Fill is earthen material placed and compacted in a hole or depression. Structures built on fill are susceptible to the same issues as those on sand and silt, especially when water washes away finer material. Settlement is worse if the fill is poorly compacted.<\/span><\/p>\n<\/div>\n<div>\n<h4><span lang=\"en-GB\">Organic<\/span><\/h4>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">Organic soils, especially peat, are weak and highly compressible making them prone to settlement, as the weight of any structure above causes compaction. Primary settlement decreases over time but can total 100s of millimetres, resulting in significant structural issues.<\/span><\/p>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">If there is an issue with the foundations of a building that needs to be remediated, the modern method of resin injection allows both ground strengthening and re-levelling of the structure, increasing the likelihood of it staying as intended and serving its purpose for the future.<\/span><\/p>\n<\/div>\n<div>\n<h4><span lang=\"en-AU\">Concrete underpinning <\/span><\/h4>\n<\/div>\n<div>\n<p><span lang=\"en-AU\">This traditional method has been used for over 100 years and has been the go-to solution for strengthening foundations affected by soil subsidence. The basic premise of concrete underpinning is to increase the depth of the structure\u2019s foundation to extend it to stronger soil. For this, large holes are dug beneath the structure and concrete is poured into the spaces in accordance with the project-specific plan. This process essentially creates new foundations underneath the original, to further stabilise the structure. <\/span><\/p>\n<p><span lang=\"en-AU\">However, this method is slow, labour-intensive causes disruption and is therefore very expensive. Access is required to the underside of the original foundation, making it an invasive solution that takes time and causes disruption for the building occupier as they are generally required to vacate their home while the work is being completed.<\/span><\/p>\n<\/div>\n<div>\n<p><span lang=\"en-AU\">A further consideration required for concrete underpinning is the strength of the soil below. Deeper soil is not necessarily stronger, combined with this the area of the concrete underpinning is often less than the area of the original strip-footing which might support a longer wall, for example, this means the underpinning is likely not as strong as the original foundations.<\/span><\/p>\n<p><span lang=\"en-AU\"> Furthermore, the extra concrete creates additional weight to the structure and in certain clay soils, the use of traditional underpinning can cause differential movement between the underpinned sections of the structure and the original foundations of the structure.<\/span><\/p>\n<\/div>\n<div>\n<h3><span lang=\"en-AU\">Resin injection<\/span><\/h3>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">Although resin injection is a relatively modern method, it is a proven one, having been used globally for over 25 years. This process involves injecting an expanding geopolymer resin into the soil beneath the existing foundation through small holes drilled into the ground, typically only 16mm in diameter from outside or inside a home. As the geopolymer enters the soil the chemical reaction results in the material expanding, compressing the surrounding soil filling any voids and cracks, providing ground improvement and lift to the structure.\u00a0<\/span><\/p>\n<\/div>\n<div>\n<p><span lang=\"en-GB\">The injection process is controlled by technicians who monitor the injection as well as the movement using laser levelling instruments; the resin components can be tailored to suit unique soil conditions and the type of performance sought. By eradicating the need to excavate, this process is cleaner and less disruptive than concrete underpinning. As large excavations underneath the original foundation are not required, the project is usually completed within a day or two and occupants can often stay in the building.\u00a0<\/span><\/p>\n<\/div>\n<div class=\"mk-custom-module-container\">\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Victor Chirilas, director of ground engineering experts, Mainmark, explores how building renovations can help meet housing targets, whilst addressing the risks involved and how to solve them.<\/p>\n","protected":false},"author":17,"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":[304],"tags":[666,429,172727,572,571,656,669],"stakeholder_rel_tag":[],"contributor_rel_tag":[],"class_list":{"0":"post-107473","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-planning-construction-news","7":"tag-affordable-housing","8":"tag-building-control","9":"tag-featured","10":"tag-housebuilding","11":"tag-housing-crisis","12":"tag-housing","13":"tag-regeneration"},"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>Can building renovations help meet housing targets?<\/title>\n<meta name=\"description\" content=\"Victor Chirilas, Mainmark, explores how building renovations can help meet housing targets, whilst addressing the risks involved and how to solve them\" \/>\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\/planning-construction-news\/building-renovations-housing-targets\/107473\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Can building renovations help meet housing targets?\" \/>\n<meta property=\"og:description\" content=\"Victor Chirilas, Mainmark, explores how building renovations can help meet housing targets, whilst addressing the risks involved and how to solve them\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pbctoday.co.uk\/news\/planning-construction-news\/building-renovations-housing-targets\/107473\/\" \/>\n<meta property=\"og:site_name\" content=\"Planning, Building &amp; 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