[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"atspace-main-nav":3,"page-\u002Fcase-studies\u002Fretrofit-air-leakage-testing-before-and-after-blower-door-results-on-a-1930s-semi":34,"atspace-footer-navs":413},[4,14,18,22,26,30],{"id":5,"to":6,"icon":7,"items":8,"label":9,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"labelAdmin":12,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"e4efaec3-54a9-4eb0-8582-4fd8770e1545","\u002Fservices",null,false,"Services","_self",true,"Internal page link","link",{"id":15,"to":16,"icon":7,"items":8,"label":17,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"b361671f-6584-4af5-8fa0-5a26da73684c","\u002Fpartner-with-us","Partner with us",{"id":19,"to":20,"icon":7,"items":8,"label":21,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"b36e0f40-bf19-4620-bab9-25d45aefb3be","\u002Fabout","About",{"id":23,"to":24,"icon":7,"items":8,"label":25,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"0902954c-7220-4174-a771-dd28ed1e48f1","\u002Fcontact","Contact",{"id":27,"to":28,"icon":7,"items":8,"label":29,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"cd688c42-d7c7-4013-a38c-64be3f793377","\u002Fknowledge-hub","Knowledge hub",{"id":31,"to":32,"icon":7,"items":8,"label":33,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"d2c943ff-8768-4ef9-88a5-1ae6b912733d","\u002Fcareers","Careers",{"data":35},{"id":36,"user_id":37,"parent_id":38,"page_type_id":39,"linked_page_id":7,"title":40,"slug":41,"full_url":42,"live":11,"data_model":43,"created_at":120,"updated_at":121,"is_homepage":8,"is_template":8,"parent":122,"seometa":130,"page_type":146,"page_type_values":173,"linked_page":7,"theme_styles":181},107,7,21,2,"Retrofit Air Leakage Testing: Before-and-After Blower Door Results on a 1930s Semi","retrofit-air-leakage-testing-before-and-after-blower-door-results-on-a-1930s-semi","\u002Fcase-studies\u002Fretrofit-air-leakage-testing-before-and-after-blower-door-results-on-a-1930s-semi",[44,102],{"name":45,"componentName":46,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":50,"group":51,"margin":7,"padding":7,"classes":52,"colSpan":7,"id":53,"originalModel":54,"borderWidth":94,"borderColor":95,"borderRadius":7,"paddingVertical":96,"blockTemplateId":97,"block_scope":98,"blockLabel":99,"blockDescription":7,"is_block":11,"paddingHorizontalSM":7,"paddingHorizontal":100,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"borderPosition":101},"Container","ColContainer","grid-cols-1","md:grid-cols-12","w-full","#ebf5f3","main","pattern_bg","f1bcde02-fe0a-4831-8ef7-833d9f4fbb17",[55],[56,62],{"colSpan":57,"colSpanSM":58,"colSpanMD":59,"colSpanLG":60,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"id":61,"borderPosition":7},"col-span-1","sm:col-span-12","md:col-span-12","lg:col-span-12","608d7c62-4a53-4ecd-90e5-9a4d00eaa4ad",{"name":63,"componentName":46,"nested":11,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":7,"group":64,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":65,"originalModel":66,"borderWidth":7,"borderColor":7,"borderRadius":7,"containerWidth":92,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"borderPosition":7},"Nested Container","main_nested","877549aa-8bc7-474b-8261-ce43bdf39dfd",[67,83],[68,73],{"colSpan":57,"colSpanSM":69,"colSpanMD":70,"colSpanLG":71,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"id":72,"borderPosition":7},"sm:col-span-6","md:col-span-6","lg:col-span-6","f5aab5dd-4d72-423a-87fb-ae305112af49",{"name":74,"componentName":75,"group":76,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":77,"originalModel":78},"WYSIWYG Editor","Wysiwyg","content","ee86e31b-348d-41ae-aea6-b0a20400b9d2",{"proseEnabled":8,"content":79,"lineHeightClass":80,"trackingClass":81,"spacingClass":82},"\u003Ch1 class=\"text-4xl md:text-5xl text-theme-dark-green font-medium mb-10 md:mb-0\" style=\"text-align: left;\">Retrofit Air Leakage Testing: Before-and-After Blower Door Results on a 1930s Semi\u003C\u002Fh1>","leading-relaxed","tracking-normal","[&_p]:my-0 [&_p+p]:mt-4",[84,86],{"id":85,"colSpan":57,"colSpanSM":69,"colSpanMD":70,"colSpanLG":71,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"borderPosition":7},"517a151c-2154-4782-b41c-3b767f63208b",{"name":87,"componentName":88,"group":76,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":89,"originalModel":90},"HTML Block","HtmlBlock","8817ddf4-0530-4257-a85f-c50e6dae808f",{"html":91,"wrapperClasses":7,"contentClasses":7},"\u003Cdiv class=\"relative flex justify-center md:justify-end\">\n  \u003C!-- wrapper controls overall size -->\n  \u003Cdiv class=\"relative w-full max-w-[560px]\">\n    \u003C!-- Pattern layer -->\n    \u003Cdiv class=\"pattern-bg-case-study absolute -inset-6 rounded-2xl\" aria-hidden=\"true\">\u003C\u002Fdiv>\n\n    \u003C!-- Green slab (offset behind image) -->\n    \u003Cdiv\n      class=\"absolute left-0 top-6 h-[260px] w-[320px] rounded-2xl bg-emerald-500\"\n      aria-hidden=\"true\"\n    >\u003C\u002Fdiv>\n\n    \u003C!-- Image -->\n    \u003Cdiv class=\"relative ml-0 md:ml-10 mt-0 overflow-hidden rounded-2xl\">\n      \u003Cimg\n        src=\"{{feature_image}}\"\n        alt=\"Case study feature\"\n        class=\"block h-[260px] w-full object-cover\"\n      \u002F>\n    \u003C\u002Fdiv>\n  \u003C\u002Fdiv>\n\u003C\u002Fdiv>","max-w-6xl mx-auto",0,"border-2","05871b","py-16",12,"standard","Our Services - Green block with bg pattern","px-7","border-b",{"name":45,"componentName":46,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":7,"group":51,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":103,"originalModel":104,"borderWidth":7,"borderColor":7,"borderRadius":7,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"paddingVertical":118,"borderPosition":7,"paddingHorizontal":119},"0634e860-5bb2-42de-aa57-b2272d325b7a",[105],[106,108],{"id":107,"colSpan":57,"colSpanSM":58,"colSpanMD":59,"colSpanLG":60,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"borderPosition":7},"769b7f36-06b0-4bcc-9fc7-b1935051d677",{"name":63,"componentName":46,"nested":11,"cols":47,"colsMD":48,"customColSpan":8,"parentAlign":49,"bgImage":7,"inlineStyles":7,"bgColor":7,"group":64,"margin":7,"padding":7,"classes":7,"colSpan":7,"id":109,"originalModel":110,"borderWidth":7,"borderColor":7,"borderRadius":7,"sticky":8,"stickyTop":93,"stickyDisableSmall":8,"containerWidth":92,"borderPosition":7},"e7c2eabd-f877-467a-89f0-aa8ef8b7f411",[111],[112,114],{"id":113,"colSpan":57,"colSpanSM":58,"colSpanMD":59,"colSpanLG":60,"customColSpan":8,"bgColor":7,"borderWidth":7,"borderColor":7,"borderRadius":7,"classes":7,"borderPosition":7},"c37da2da-dc4c-4238-938b-031fe5501f7d",{"name":74,"componentName":75,"group":76,"margin":7,"padding":7,"classes":7,"bgImage":7,"id":115,"originalModel":116},"30243da6-e294-4dbe-9226-f959bbb2a3d8",{"proseEnabled":11,"content":117,"lineHeightClass":80,"trackingClass":81,"spacingClass":82},"\u003Cdiv class=\"et_pb_column et_pb_column_2_3 et_pb_column_2_tb_body  et_pb_css_mix_blend_mode_passthrough\">\n\u003Cdiv class=\"et_pb_module et_pb_post_content et_pb_post_content_0_tb_body\">\n\u003Cdiv>\n\u003Ch2>\u003Cstrong>The Result\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>A 1930s semi‑detached home underwent an energy retrofit, but the client wanted proof that the building fabric actually improved — not just upgraded paperwork. ATSPACE carried out before‑and‑after blower‑door testing, identified the dominant leakage routes, guided practical sealing, and re‑tested to confirm real improvement.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Measured results:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Before retrofit:\u003C\u002Fstrong> 11.6 m³\u002Fh·m² at 50 Pa\u003C\u002Fli>\n\u003Cli>\u003Cstrong>After retrofit:\u003C\u002Fstrong> 5.9 m³\u002Fh·m² at 50 Pa\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>A clear step‑change in uncontrolled leakage — achieved without invasive rework and with ventilation checks included to ensure improved comfort without moisture risk.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project Snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Retrofit air leakage testing\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Private homeowner + retrofit contractor\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> 27 Hawthorn Crescent, Kings Heath, Birmingham B14 6QW\u003Cbr>\u003Cstrong>Property type:\u003C\u002Fstrong> 1930s semi‑detached, two‑storey\u003Cbr>\u003Cstrong>Construction:\u003C\u002Fstrong> Solid\u002Fcavity mix, suspended timber ground floor, pitched roof\u003Cbr>\u003Cstrong>Retrofit works:\u003C\u002Fstrong> Loft\u002Funderfloor insulation, window\u002Fdoor upgrades, targeted airtightness improvements\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Baseline test → Post‑works verification test\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> Baseline test, leak tracing, close‑out plan, verification test, retrofit evidence reporting\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why Retrofit Air Leakage Testing Mattered\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Retrofit succeeds only if air leakage is controlled. This home had three classic 1930s‑era issues:\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>1. Suspended timber floors + open void pathways\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Sub‑floor air moved through voids, service routes, stair zones — undermining comfort.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>2. Chimney and fireplace routes\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Redundant flues acted like extraction paths, often dominating leakage.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>3. Lots of small gaps everywhere\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Skirtings, floorboards, loft hatches, vents, boxing, and decades of service penetrations.\u003C\u002Fp>\n\u003Cp>The homeowner’s goal: \u003Cstrong>make the home warmer, reduce drafts, prove measurable improvement\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What a Blower Door Test Proves in Retrofit\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>A blower‑door test measures uncontrolled air leakage — but the real value is:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>establishing a baseline\u003C\u002Fli>\n\u003Cli>finding high‑impact leak routes\u003C\u002Fli>\n\u003Cli>prioritising fixes\u003C\u002Fli>\n\u003Cli>verifying improvements\u003C\u002Fli>\n\u003Cli>avoiding wasted retrofit spend\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>It also ensures that increasing airtightness doesn’t compromise ventilation or moisture control.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Homeowner’s Problem Before Work Started\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The homeowner described:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>cold ground‑floor rooms\u003C\u002Fli>\n\u003Cli>drafts around hallway\u002Fstairs\u003C\u002Fli>\n\u003Cli>difficulty maintaining warmth\u003C\u002Fli>\n\u003Cli>cold spots near bay window\u002Ffront door\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Insulation alone would not fix these issues. They needed airtightness insight — and proof.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What ATSPACE Did\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Baseline blower‑door test\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Baseline result: \u003Cstrong>11.6 m³\u002Fh·m² at 50 Pa\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 2: Diagnostic leak tracing\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We traced airflow under pressure to identify dominant leakage routes (not every tiny gap):\u003C\u002Fp>\n\u003Col>\n\u003Cli>\n\u003Cp>\u003Cstrong>Suspended floor perimeter + service penetrations\u003C\u002Fstrong>\u003Cbr>Air rising from sub‑floor voids into hallway + living room.\u003C\u002Fp>\n\u003C\u002Fli>\n\u003Cli>\n\u003Cp>\u003Cstrong>Chimney route + redundant fireplace openings\u003C\u002Fstrong>\u003Cbr>Strong stack‑effect leakage.\u003C\u002Fp>\n\u003C\u002Fli>\n\u003Cli>\n\u003Cp>\u003Cstrong>Loft hatch + ceiling penetrations\u003C\u002Fstrong>\u003Cbr>Weak compression and sealing.\u003C\u002Fp>\n\u003C\u002Fli>\n\u003Cli>\n\u003Cp>\u003Cstrong>Bay window junctions\u003C\u002Fstrong>\u003Cbr>Small discontinuities from historic repairs.\u003C\u002Fp>\n\u003C\u002Fli>\n\u003Cli>\n\u003Cp>\u003Cstrong>Front door threshold + frame line\u003C\u002Fstrong>\u003Cbr>Common weak point on older properties.\u003C\u002Fp>\n\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Ch3>\u003Cstrong>Step 3: A practical close‑out plan for a 1930s house\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Actions included:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>sealing suspended floor perimeter points where accessible\u003C\u002Fli>\n\u003Cli>safe closure of redundant flue routes\u003C\u002Fli>\n\u003Cli>improving loft hatch sealing\u002Fcompression\u003C\u002Fli>\n\u003Cli>sealing penetrations linking floor voids to living spaces\u003C\u002Fli>\n\u003Cli>improving front‑door seal continuity\u003C\u002Fli>\n\u003Cli>confirming bay‑window reveal continuity\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The plan avoided intrusive work and focused on \u003Cstrong>continuity\u003C\u002Fstrong>, not cosmetic sealant.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 4: Post‑works verification blower‑door test\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Post‑works result: \u003Cstrong>5.9 m³\u002Fh·m² at 50 Pa\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why the Improvement Mattered\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The homeowner gained:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>reduced cold air infiltration\u003C\u002Fli>\n\u003Cli>more stable temperatures\u003C\u002Fli>\n\u003Cli>improved comfort without extra heating\u003C\u002Fli>\n\u003Cli>fewer hallway\u002Fliving‑room drafts\u003C\u002Fli>\n\u003Cli>clear evidence the retrofit worked\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The contractor gained a repeatable method for similar homes.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Practical Lessons from This 1930s Semi\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Lesson 1: The biggest leaks aren’t where people think\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Sub‑floor voids + chimneys were more important than visible gaps.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Lesson 2: Suspended floor airtightness is a major opportunity\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Insulation alone doesn’t solve comfort unless air pathways are controlled.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Lesson 3: Loft hatches often leak far more than expected\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Simple improvements deliver big gains.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Lesson 4: Verification changes everything\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Without post‑testing, improvement is guesswork. With testing, it’s proven.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Common Mistakes This Project Avoided\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>relying on insulation without leakage control\u003C\u002Fli>\n\u003Cli>sealing only visible gaps\u003C\u002Fli>\n\u003Cli>ignoring chimney pathways\u003C\u002Fli>\n\u003Cli>upgrading windows\u002Fdoors without junction continuity checks\u003C\u002Fli>\n\u003Cli>improving airtightness without reviewing ventilation\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If you are retrofitting an older home and want proof your upgrade worked, ATSPACE retrofit air leakage testing delivers a baseline, identifies real leaks, and verifies improvement.\u003C\u002Fp>\n\u003Cp>Ask for:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>baseline + post‑retrofit blower‑door testing\u003C\u002Fli>\n\u003Cli>diagnostic leak tracing\u003C\u002Fli>\n\u003Cli>practical close‑out guidance for older homes\u003C\u002Fli>\n\u003Cli>reporting for evidence packs + contractor sign‑off\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently Asked Questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Do you need a blower‑door test on a retrofit?\u003C\u002Fstrong>\u003Cbr>Not mandatory — but it’s the most reliable way to prove improvement.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>What’s a good air permeability result for an older home?\u003C\u002Fstrong>\u003Cbr>It varies — the key is \u003Cem>measurable improvement\u003C\u002Fem> and ensuring ventilation suitability.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Can you test before and after works?\u003C\u002Fstrong>\u003Cbr>Yes — this is the standard retrofit approach.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Will airtightness improvement cause condensation?\u003C\u002Fstrong>\u003Cbr>Only if ventilation isn’t considered. Both must be planned together.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>What are the most common leaks in 1930s houses?\u003C\u002Fstrong>\u003Cbr>Suspended floor voids, chimney routes, loft hatches, service entries, and thresholds.\u003C\u002Fp>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>","py-7","px-5","2026-03-26T11:27:37.000000Z","2026-03-26T11:31:07.000000Z",{"id":38,"user_id":123,"parent_id":7,"page_type_id":7,"linked_page_id":7,"title":124,"slug":125,"full_url":126,"live":11,"data_model":127,"created_at":128,"updated_at":128,"text_content_only":129,"html_content_only":129,"is_homepage":8,"is_template":8,"is_password_protected":8,"page_password":7,"parent":7},1,"Case Studies","case-studies","\u002Fcase-studies",[],"2026-02-04T16:38:09.000000Z","",{"id":131,"meta_title":40,"meta_description":132,"seoable_id":36,"seoable_type":133,"keyword_focus":134,"search_intent":135,"cornerstone_content":8,"canonical_url":136,"meta_robots":137,"og_title":40,"og_description":132,"og_image":138,"og_type":139,"og_url":136,"twitter_card":140,"twitter_title":40,"twitter_description":132,"twitter_image":138,"schema_markup":7,"extra_meta":7,"ai_field_locks":141,"insights":7,"serp_insights":7,"hreflang_alternates":7,"json_ld":7,"sitemap_changefreq":142,"sitemap_priority":143,"created_at":144,"updated_at":145},246,"Discover how a 1930s semi-detached home improved its energy efficiency through retrofit air leakage testing, showcasing significant before-and-after results.","Kabaddle\\PagesModule\\Models\\Page","about water calculations","informational","https:\u002F\u002Fatspaceltd.co.uk\u002Fcase-studies\u002Fretrofit-air-leakage-testing-before-and-after-blower-door-results-on-a-1930s-semi","index, follow","https:\u002F\u002Fatspace-ltd.s3.eu-west-2.amazonaws.com\u002Fuploads\u002Fsite-image.png","website","summary",{"og_url":8,"og_type":8,"og_image":8,"og_title":8,"extra_meta":8,"meta_title":8,"meta_robots":8,"twitter_card":8,"canonical_url":8,"keyword_focus":8,"schema_markup":8,"twitter_image":8,"twitter_title":8,"og_description":8,"meta_description":8,"twitter_description":8},"monthly","0.5","2026-03-26T11:27:41.000000Z","2026-05-07T09:57:54.000000Z",{"id":39,"name":147,"slug":148,"description":7,"fields":149,"values":164},"Case Study","case-study",[150,159],{"id":151,"label":152,"handle":153,"type":154,"required":11,"instructions":7,"settings":155,"sort_order":93},8,"Feature Image","feature_image","image",{"min_width":156,"min_height":157,"crop_enabled":8,"resize_width":156,"resize_height":157,"resize_enabled":11,"resize_quality":158},600,300,85,{"id":160,"label":161,"handle":162,"type":162,"required":11,"instructions":7,"settings":163,"sort_order":123},9,"Tags","tags",{"min_width":7,"min_height":7,"crop_enabled":8,"resize_width":7,"resize_height":7,"resize_enabled":8,"resize_quality":158},{"feature_image":165,"tags":166},"https:\u002F\u002Fatspace-ltd.s3.eu-west-2.amazonaws.com\u002Fuploads\u002Fpages\u002Fretrofitairleakagetestingbefore-and-afterblowerdoorresultsona1930ssem.jpeg",[167,169],{"id":168,"name":147,"slug":148},4,{"id":170,"name":171,"slug":172},11,"Retrofit","retrofit",[174,178],{"id":175,"page_id":36,"page_type_field_id":151,"value":165,"created_at":176,"updated_at":177},249,"2026-03-26T11:27:43.000000Z","2026-04-02T10:31:15.000000Z",{"id":179,"page_id":36,"page_type_field_id":160,"value":180,"created_at":176,"updated_at":177},250,[168,170],{"version":182,"wrapper_attribute":183,"stylesheet_url":184,"layout_classes":185,"head_links":186,"wysiwyg_default_class_presets":195,"wysiwyg_class_presets":367,"wysiwyg_default_color_presets":387,"wysiwyg_color_presets":412},"1781598099-13ddca9f","data-site-theme-wrapper","https:\u002F\u002Fportal.atspaceltd.co.uk\u002Ftheme\u002Fsite.css","min-h-screen transition-colors duration-500 bg-[#f7f8fc] text-slate-900 bg-white",[187,190,192],{"rel":188,"href":189},"preconnect","https:\u002F\u002Ffonts.googleapis.com",{"rel":188,"href":191},"https:\u002F\u002Ffonts.gstatic.com",{"rel":193,"href":194},"stylesheet","https:\u002F\u002Ffonts.googleapis.com\u002Fcss2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Roboto:ital,wght@0,100..900;1,100..900&display=swap",{"image":196,"text_size":211,"text_style":232,"line_height":253,"tracking":270,"spacing":290,"general":307},[197,199,202,205,208],{"label":198,"value":129},"Default (no extra classes)",{"label":200,"value":201},"Responsive – natural width","max-w-full h-auto",{"label":203,"value":204},"Responsive – full width","w-full h-auto",{"label":206,"value":207},"Rounded responsive","max-w-full h-auto rounded-lg",{"label":209,"value":210},"Shadowed responsive","max-w-full h-auto rounded-lg shadow-lg",[212,214,217,220,223,226,229],{"label":213,"value":129},"No size class",{"label":215,"value":216},"Heading XL (H1)","mt-0 pb-4 text-4xl md:text-5xl font-bold leading-tight",{"label":218,"value":219},"Heading Large (H2)","mt-0 pb-3 text-3xl md:text-4xl font-bold leading-tight",{"label":221,"value":222},"Heading Medium (H3)","mt-0 pb-3 text-2xl md:text-3xl font-semibold leading-snug",{"label":224,"value":225},"Paragraph Large","mt-0 pb-4 text-lg leading-relaxed",{"label":227,"value":228},"Paragraph Default","mt-0 pb-3 text-base leading-7",{"label":230,"value":231},"Paragraph Small","mt-0 pb-2 text-sm leading-6 text-slate-600",[233,235,238,241,244,247,250],{"label":234,"value":129},"No text style class",{"label":236,"value":237},"Page Title Style","mt-0 font-extrabold text-4xl md:text-5xl text-theme-dark-green leading-[1.2em]",{"label":239,"value":240},"Highlighter Mark","highlight-mark",{"label":242,"value":243},"Lead paragraph","lead",{"label":245,"value":246},"Small muted text","text-sm text-gray-500",{"label":248,"value":249},"Highlighted text","font-semibold text-emerald-700",{"label":251,"value":252},"Uppercase eyebrow","uppercase tracking-wide text-xs font-semibold text-slate-500",[254,256,259,262,265,267],{"label":255,"value":129},"No line-height class",{"label":257,"value":258},"Tight line height","leading-tight",{"label":260,"value":261},"Snug line height","leading-snug",{"label":263,"value":264},"Normal line height","leading-normal",{"label":266,"value":80},"Relaxed line height",{"label":268,"value":269},"Loose line height","leading-loose",[271,273,276,279,281,284,287],{"label":272,"value":129},"No tracking class",{"label":274,"value":275},"Tracking tighter","tracking-tighter",{"label":277,"value":278},"Tracking tight","tracking-tight",{"label":280,"value":81},"Tracking normal",{"label":282,"value":283},"Tracking wide","tracking-wide",{"label":285,"value":286},"Tracking wider","tracking-wider",{"label":288,"value":289},"Tracking widest","tracking-widest",[291,293,296,298,301,304],{"label":292,"value":129},"No spacing class",{"label":294,"value":295},"Paragraph spacing – tight","[&_p]:my-0 [&_p+p]:mt-2",{"label":297,"value":82},"Paragraph spacing – default",{"label":299,"value":300},"Paragraph spacing – comfortable","[&_p]:my-0 [&_p+p]:mt-6",{"label":302,"value":303},"Heading + paragraph rhythm","[&_h1]:mb-4 [&_h2]:mb-3 [&_h3]:mb-3 [&_h4]:mb-2 [&_p]:my-0 [&_p+p]:mt-4",{"label":305,"value":306},"Lists rhythm","[&_ul]:my-3 [&_ol]:my-3 [&_li+li]:mt-1",[308,310,313,316,319,322,325,328,331,334,337,340,343,346,349,352,355,358,361,364],{"label":309,"value":129},"No class",{"label":311,"value":312},"Opacity 100%","opacity-100",{"label":314,"value":315},"Opacity 90%","opacity-90",{"label":317,"value":318},"Opacity 75%","opacity-75",{"label":320,"value":321},"Opacity 50%","opacity-50",{"label":323,"value":324},"Opacity 30%","opacity-30",{"label":326,"value":327},"Margin bottom none","mb-0",{"label":329,"value":330},"Margin bottom small","mb-2",{"label":332,"value":333},"Margin bottom medium","mb-4",{"label":335,"value":336},"Margin bottom large","mb-6",{"label":338,"value":339},"Section title","section-title",{"label":341,"value":342},"Block quote","border-l-4 border-slate-300 pl-4 italic text-slate-700",{"label":344,"value":345},"Pull quote","my-6 rounded-xl border border-slate-200 bg-slate-50 p-6 text-xl leading-relaxed text-slate-800",{"label":347,"value":348},"Info callout","rounded-lg border border-sky-200 bg-sky-50 p-4 text-sky-900",{"label":350,"value":351},"Muted panel","rounded-lg bg-slate-100 p-4 text-slate-700",{"label":353,"value":354},"Lists: inherit text + marker colour","[&_ul]:text-inherit [&_ol]:text-inherit [&_li]:text-inherit [&_li::marker]:text-current",{"label":356,"value":357},"Lists: no indent","[&_ul]:pl-0 [&_ol]:pl-0 [&_ul]:ml-0 [&_ol]:ml-0",{"label":359,"value":360},"Lists: no indent (inside markers)","[&_ul]:pl-0 [&_ol]:pl-0 [&_ul]:ml-0 [&_ol]:ml-0 [&_ul]:list-inside [&_ol]:list-inside",{"label":362,"value":363},"Key facts list","list-disc space-y-2 pl-6 marker:text-slate-500",{"label":365,"value":366},"Code inline","rounded bg-slate-100 px-1.5 py-0.5 font-mono text-[0.9em] text-slate-800",{"image":368,"text_size":369,"text_style":370,"line_height":383,"tracking":384,"spacing":385,"general":386},[],[],[371,374,377,380],{"label":372,"value":373},"Default (inherit)","None",{"label":375,"value":376},"Sans serif","font-sans",{"label":378,"value":379},"Serfi","font-serif",{"label":381,"value":382},"Monospace","font-mono",[],[],[],[],[388,391,394,397,400,403,406,409],{"label":389,"value":390},"Body text","#1F2937",{"label":392,"value":393},"Muted text","#6B7280",{"label":395,"value":396},"Heading dark","#111827",{"label":398,"value":399},"Primary brand","#0284C7",{"label":401,"value":402},"Success","#059669",{"label":404,"value":405},"Warning","#D97706",{"label":407,"value":408},"Danger","#DC2626",{"label":410,"value":411},"White","#FFFFFF",[],[414,429,462,475,512,521],[415,417,419,421,423,425],{"id":416,"to":16,"icon":7,"items":8,"label":17,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"7bc32343-19dd-4628-9f6f-d81dd41680a2",{"id":418,"to":20,"icon":7,"items":8,"label":21,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"61f29609-258e-4a1b-a81e-293d1039a1c4",{"id":420,"to":28,"icon":7,"items":8,"label":29,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"fb09cc92-9921-49bf-98ff-4b985b8c9baa",{"id":422,"to":24,"icon":7,"items":8,"label":25,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"b8b03433-8a13-485f-a874-4fe30a715494",{"id":424,"to":32,"icon":7,"items":8,"label":33,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"ea8625f5-96a7-4a86-b573-f25f299c6f08",{"id":426,"to":427,"icon":7,"items":8,"label":428,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"38a1e249-95df-4ddf-a862-691fd0e7a25f","\u002Fblog","Blog",[430,434,438,442,446,450,454,458],{"id":431,"to":432,"icon":7,"items":8,"label":433,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"ec519beb-33dd-4275-aa89-4b9acec78626","\u002Fservices\u002Fenergy-statements","Energy Statements",{"id":435,"to":436,"icon":7,"items":8,"label":437,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"a5bb7874-1b6a-430c-86d0-72b6ac222385","\u002Fservices\u002Fsap-calculations","SAP Calculations",{"id":439,"to":440,"icon":7,"items":8,"label":441,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"af14dfcd-3544-4a60-b6c0-dee218e214dd","\u002Fservices\u002Fsbem-calculations","SBEM Calculations",{"id":443,"to":444,"icon":7,"items":8,"label":445,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"0901f274-10a6-4d01-a09d-1b7e1db0d581","\u002Fservices\u002Fwater-efficiency-calculations","Water Efficiency Calculations",{"id":447,"to":448,"icon":7,"items":8,"label":449,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"512ca44b-ff3d-4a4e-b268-0dd1e8ac7122","\u002Fservices\u002Foverheating-assessments","Overheating Assessments",{"id":451,"to":452,"icon":7,"items":8,"label":453,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"8e33dd61-9f98-47db-8913-58a58b8431f2","\u002Fservices\u002Foverglazed-extension-calculations","Overglazed Extension Calculations",{"id":455,"to":456,"icon":7,"items":8,"label":457,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"56cbf8f1-560c-46ea-82dd-d2bc75350076","\u002Fservices\u002Fu-value-calculations","U-value Calculations",{"id":459,"to":460,"icon":7,"items":8,"label":461,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"2e407cc6-56cf-43f3-9584-3541adeff365","\u002Fservices\u002Fpsi-values","PSI Values",[463,467,471],{"id":464,"to":465,"icon":7,"items":8,"label":466,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"50e1c2d4-9067-4eee-81e2-40de42f9443b","\u002Fservices\u002Fdiagnostic-air-leakage-testing","Diagnostic Air Leakage Testing",{"id":468,"to":469,"icon":7,"items":8,"label":470,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"21279013-e0f2-4bd2-8f0d-8359f14af74e","\u002Fservices\u002Fpre-improvement-sound-insulation-testing","Pre-improvement Sound Insulation Testing",{"id":472,"to":473,"icon":7,"items":8,"label":474,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"f28856d9-bd52-4d8f-8934-c20a2df6f2a0","\u002Fservices\u002Fair-leakage-on-site-design-advice","Air Leakage On-site Design Advice",[476,480,484,488,492,496,500,504,508],{"id":477,"to":478,"icon":7,"items":8,"label":479,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"f9d3a9e3-e414-47e7-bb96-e2fb0c539231","\u002Fservices\u002Fresidential-air-leakage-testing","Residential Air Leakage Testing",{"id":481,"to":482,"icon":7,"items":8,"label":483,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"64a87166-10a8-42f9-99f3-dd8ad1a01c21","\u002Fservices\u002Fcommercial-air-leakage-testing","Commercial Air Leakage Testing",{"id":485,"to":486,"icon":7,"items":8,"label":487,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"e4399df9-c703-4daf-af96-511f4b932a56","\u002Fservices\u002Fsmoke-shaft-air-leakage-testing","Smoke Shaft Air Leakage Testing",{"id":489,"to":490,"icon":7,"items":8,"label":491,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"fac046b5-95e4-4683-9065-4f5631eca10c","\u002Fservices\u002Fsmart-htc","SmartHTC",{"id":493,"to":494,"icon":7,"items":8,"label":495,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"2b18d3e9-d191-4f55-8bf7-e5cbed8ba1a4","\u002Fservices\u002Fpassive-house-air-leakage-testing","Passive House Air Leakage Testing",{"id":497,"to":498,"icon":7,"items":8,"label":499,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"d5d9aba3-4fe3-4b5b-8c7b-fdda731bf96b","\u002Fservices\u002Fretrofit-air-leakage-testing","Retrofit Air Leakage Testing",{"id":501,"to":502,"icon":7,"items":8,"label":503,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"16f1de68-d8f9-4287-a377-9189fd9096b4","\u002Fservices\u002Fsound-insulation-testing","Sound Insulation Testing",{"id":505,"to":506,"icon":7,"items":8,"label":507,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"8edc23cb-d991-4cd7-8be3-05ac581623f2","\u002Fservices\u002Fventilation-flow-rate-testing","Ventilation Flow Rate Testing",{"id":509,"to":510,"icon":7,"items":8,"label":511,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"a499f916-be6d-417a-b74f-7d36840bf88d","\u002Fservices\u002Fbackground-ventilation-testing","Background Ventilation Testing",[513,517],{"id":514,"to":515,"icon":7,"items":8,"label":516,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"c729f2d1-c26a-4940-8bf6-31c57646a312","\u002Fservices\u002Fnew-build-conversion-domestic-epc-assessment","New Build\u002FConversion Domestic EPC Assessment",{"id":518,"to":519,"icon":7,"items":8,"label":520,"target":10,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"a3a30524-718e-4c56-9698-d61b39645487","\u002Fservices\u002Fnew-build-conversion-commercial-epc-assessment","New Build\u002FConversion Commercial EPC Assessment",[522,526,530],{"id":523,"to":524,"icon":7,"items":8,"label":525,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"622430f3-825d-4f59-a3b9-a0aecece4371","\u002Fterms-and-conditions","Terms & Conditions",{"id":527,"to":528,"icon":7,"items":8,"label":529,"target":10,"toggle":8,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"0d050c9f-d69f-4fd0-ac64-6ae522d5d3bf","\u002Fprivacy-policy","Privacy Policy",{"id":531,"to":532,"icon":7,"items":8,"label":533,"target":534,"toggle":11,"command":7,"to_page":7,"visible":11,"disabled":8,"is_button":8,"separator":8,"align_right":8,"logged_in_only":8,"display_variant":13,"not_logged_in_only":8},"66a0a788-fbc0-4843-9502-6049e1b80796","https:\u002F\u002Fatspace-ltd.s3.eu-west-2.amazonaws.com\u002Fuploads\u002Fatspace-trade-credit-application-form.pdf","Trade Application","_blank"]