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Target","commercial-air-leakage-test-pass-first-time-office-fit-out-hits-part-l-airtightness-target","\u002Fcase-studies\u002Fcommercial-air-leakage-test-pass-first-time-office-fit-out-hits-part-l-airtightness-target",[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;\">Commercial Air Leakage Test Pass First Time: Office Fit-Out Hits Part L Air Tightness Target\u003C\u002Fh1>\n\u003Ch1 class=\"text-4xl md:text-5xl text-theme-dark-green font-medium mb-10 md:mb-0\" style=\"text-align: left;\">\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\u003Ch3>\u003Cstrong>The Headline Result\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cdiv>\n\u003Cp>ATSPACE helped an office fit-out achieve a first-time pass on its commercial air leakage (pressure) test by controlling the basics: readiness checks, airtightness close-out across interfaces, and a planned test sequence that avoided last-minute rework. The result was Part L‑aligned evidence at practical completion without programme disruption.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project Snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Commercial Air Leakage Testing (Non-domestic pressure testing)\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Principal contractor (CAT A\u002FCAT B fit-out) – anonymised\u003Cbr>\u003Cstrong>Building type:\u003C\u002Fstrong> Office (refurb + fit-out)\u003Cbr>\u003Cstrong>Location:\u003C\u002Fstrong> Meridian House, Kingsway Business Quarter, Birmingham (address anonymised)\u003Cbr>\u003Cstrong>Size:\u003C\u002Fstrong> Approx. 4,600 m² over 5 floors\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Pre-PC \u002F commissioning window\u003Cbr>\u003Cstrong>Regulatory driver:\u003C\u002Fstrong> Part L (non-domestic compliance evidence)\u003Cbr>\u003Cstrong>ATSPACE team:\u003C\u002Fstrong> Accredited Airtightness Test Engineer + Compliance Coordinator\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What Made This Job Risky\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Office fit-outs fail airtightness tests for different reasons than new‑build housing. The building can appear “finished”, but airtightness performance breaks down at the interfaces.\u003C\u002Fp>\n\u003Cp>This project had three classic fit‑out risk factors:\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>1) The airtightness line crossed multiple scopes\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>The airtightness layer wasn’t owned by a single trade. It ran through:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>base-build façade and risers\u003C\u002Fli>\n\u003Cli>fit-out partitions and ceilings\u003C\u002Fli>\n\u003Cli>M&E penetrations (fan coils, ductwork, sprinkler pipework, data routes)\u003C\u002Fli>\n\u003Cli>fire stopping in service zones\u003C\u002Fli>\n\u003Cli>door sets, thresholds and access panels\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>If these scopes don’t join up, leakage appears fast.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>2) Late-stage changes were still happening\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>As with most offices approaching PC:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>last-minute data\u002Fcontainment additions\u003C\u002Fli>\n\u003Cli>ceiling tile lifts and reinstalls\u003C\u002Fli>\n\u003Cli>access panel changes\u003C\u002Fli>\n\u003Cli>“one more penetration” into risers or plant\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>These changes can undo airtightness work in a single day.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>3) A failed test would have hit programme and cost hard\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>A failed test in commercial fit-out often triggers:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>delayed PC evidence\u003C\u002Fli>\n\u003Cli>re-access above ceilings and behind finishes\u003C\u002Fli>\n\u003Cli>disruption to commissioning\u003C\u002Fli>\n\u003Cli>out-of-hours remedials\u003C\u002Fli>\n\u003Cli>retest delays (and disputes)\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The client didn’t want a test — they wanted certainty.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What Is a Commercial Air Leakage Test (Plain English)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>A commercial air leakage test measures how much uncontrolled air escapes through the building envelope under pressure.\u003C\u002Fp>\n\u003Cp>Why it matters:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>supports energy performance and Part L\u003C\u002Fli>\n\u003Cli>reduces heat loss and improves HVAC stability\u003C\u002Fli>\n\u003Cli>proves the building performs as intended at PC\u003C\u002Fli>\n\u003Cli>avoids “paper compliance” that doesn’t match reality\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>ATSPACE’s role is to make that outcome \u003Cem>repeatable\u003C\u002Fem>, not lucky.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Brief to ATSPACE\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The contractor asked ATSPACE to:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>carry out the commercial pressure test within a tight pre‑PC window\u003C\u002Fli>\n\u003Cli>reduce retest risk by identifying weak points before test day\u003C\u002Fli>\n\u003Cli>support close-out with practical, achievable guidance\u003C\u002Fli>\n\u003Cli>provide clear reporting suitable for compliance and handover\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What ATSPACE Did (The Method That Makes First-Time Passes Normal)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Airtightness readiness review (before test day)\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We completed a targeted walkdown with the site manager and M&E lead, focusing on the leakage routes that most commonly fail office fit-outs.\u003C\u002Fp>\n\u003Cp>Typical high‑risk items on this job:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>riser doors and access panels (seal continuity + latching)\u003C\u002Fli>\n\u003Cli>ceiling void penetrations (sprinklers, ductwork, containment, pipe drops)\u003C\u002Fli>\n\u003Cli>façade-to-slab and façade-to-ceiling junctions\u003C\u002Fli>\n\u003Cli>plant and comms room service entries\u003C\u002Fli>\n\u003Cli>perimeter glazing interfaces and thresholds\u003C\u002Fli>\n\u003Cli>roof upstands, hatches and smoke vents (if applicable)\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>These points cause most retests in commercial buildings.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 2: Close-out actions trades could actually deliver\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We gave practical, trade-friendly guidance such as:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>ensuring access panels have continuous compressible seals\u003C\u002Fli>\n\u003Cli>confirming penetrations are sealed as part of fire stopping\u003C\u002Fli>\n\u003Cli>sealing door thresholds and frame-to-structure gaps behind trims\u003C\u002Fli>\n\u003Cli>controlling ceiling tile lifts post sign-off (to prevent broken seals)\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The goal was simple: \u003Cstrong>eliminate rework before it occurs\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 3: Test-day control (conditions, sequencing, evidence)\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>On test day, ATSPACE controlled:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>zoning and door positions\u003C\u002Fli>\n\u003Cli>temporary sealing arrangements (only where appropriate)\u003C\u002Fli>\n\u003Cli>internal pressure equalisation routes\u003C\u002Fli>\n\u003Cli>the test sequence to maintain stability and minimise disruption\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 4: Reporting that doesn’t create admin pain\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We delivered:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>clear test results and test conditions\u003C\u002Fli>\n\u003Cli>compliance-ready certification\u003C\u002Fli>\n\u003Cli>concise learning notes for future phases\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>The Real Problems We Faced (And How They Were Solved)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Problem A: Riser access panels looked complete—but weren’t airtight\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>A few riser panels had inconsistent compressible seals and uneven closure pressure.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> confirm continuous seals and correct latching.\u003Cbr>\u003Cstrong>Why it matters:\u003C\u002Fstrong> risers behave like vertical leakage chimneys.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Problem B: Ceiling void penetrations were still being modified\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Containment routes and M&E details were still being adjusted late.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> agree a penetrations “freeze point” and seal unavoidable late works immediately.\u003Cbr>\u003Cstrong>Why it matters:\u003C\u002Fstrong> these late changes are a leading cause of failed first tests.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Problem C: Threshold detailing around plant\u002Fservice doors\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Multiple materials met at thresholds, creating gaps.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> verify seal continuity before finishes locked the interface in.\u003Cbr>\u003Cstrong>Why it matters:\u003C\u002Fstrong> small threshold leaks can have a large impact in commercial spaces.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Results\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>Commercial air leakage test passed first time\u003C\u002Fli>\n\u003Cli>Part L‑aligned evidence achieved at practical completion\u003C\u002Fli>\n\u003Cli>No retest programme impact\u003C\u002Fli>\n\u003Cli>Reduced disruption to commissioning and defects\u003C\u002Fli>\n\u003Cli>Reporting ready for handover packs\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What This Project Proves\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>On office fit-outs, airtightness success comes down to \u003Cstrong>interface control\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Cp>Airtightness sits between:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>base build and fit-out\u003C\u002Fli>\n\u003Cli>fire stopping and M&E\u003C\u002Fli>\n\u003Cli>ceilings and risers\u003C\u002Fli>\n\u003Cli>door sets, frames and thresholds\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>When these interfaces are controlled early, first-time passes stop being luck.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Common Mistakes on Office Fit-Out Airtightness Testing\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>booking tests before risers are properly closed out\u003C\u002Fli>\n\u003Cli>allowing ceiling tile lifts after “readiness” is declared\u003C\u002Fli>\n\u003Cli>relying on trims instead of sealing the air path\u003C\u002Fli>\n\u003Cli>inconsistent seals on access panels and service doors\u003C\u002Fli>\n\u003Cli>incomplete fire stopping around services\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If your office fit-out is approaching PC and you need a first‑time commercial air leakage test pass, ATSPACE can support with:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>airtightness readiness walkdowns\u003C\u002Fli>\n\u003Cli>commercial pressure testing\u003C\u002Fli>\n\u003Cli>rapid troubleshooting if readings are inconsistent\u003C\u002Fli>\n\u003Cli>compliance-ready evidence for handover\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>FAQ\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>What is the difference between domestic and commercial airtightness testing?\u003C\u002Fstrong>\u003Cbr>Commercial testing has larger volumes, more complex service routes, and more interface risk. 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