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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;\">On-Site Air Tightness Design Advice That Prevented a Failed Air Test on Plot 17\u003C\u002Fh1>","leading-relaxed","tracking-normal","[&_p]:my-0 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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>Plot 17 was heading for a failed airtightness test. The build looked finished, but key junctions were not forming a continuous airtight layer. ATSPACE provided on‑site airtightness design advice, targeted the real leakage routes, and helped the team close them out in a practical way. Plot 17 passed its Part L airtightness test first time, with no retest delay and no disruptive strip‑out.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project Snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Air leakage on‑site design advice\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Regional housebuilder\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> Oakfield Grange, Waverton Road, Chester CH3\u003Cbr>\u003Cstrong>Build type:\u003C\u002Fstrong> 3‑storey new‑build townhouse\u003Cbr>\u003Cstrong>Plot:\u003C\u002Fstrong> 17\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Late second fix, pre‑test\u003Cbr>\u003Cstrong>Compliance driver:\u003C\u002Fstrong> Approved Document Part L\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> On‑site design advice visit, leak path checks, close‑out actions, recheck prior to test\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What Was Happening on Plot 17\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The site team had good airtightness results on earlier plots, but Plot 17 differed. It had more services, a slightly altered layout, and extra penetrations added late. It was also the \u003Cstrong>first plot of this house type\u003C\u002Fstrong> to reach test stage — and first‑of‑type plots often reveal design coordination gaps.\u003C\u002Fp>\n\u003Cp>From a quick walk round, everything looked fine. The problem was \u003Cstrong>continuity behind the finishes\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Cp>If Plot 17 failed, the programme would slip — and every similar plot behind it would be at risk.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why Airtightness Fails Even When the Build Looks Finished\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Airtightness failure rarely comes from one big leak — it comes from multiple small gaps that add up.\u003C\u002Fp>\n\u003Cp>Typical causes on plots like this:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Service penetrations boxed in but not sealed\u003C\u002Fli>\n\u003Cli>Party wall drylining stopping short of the airtight layer\u003C\u002Fli>\n\u003Cli>Loft hatches with uneven compression\u003C\u002Fli>\n\u003Cli>Gaps behind meter\u002Fconsumer unit zones\u003C\u002Fli>\n\u003Cli>Floor edge junctions and stair void interfaces\u003C\u002Fli>\n\u003Cli>Penetrations in kitchens\u002Fbathrooms hidden behind units\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Once finishes go in, access disappears — making fixes costly.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What ATSPACE Was Asked To Do\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The brief:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Confirm if Plot 17 was genuinely test‑ready\u003C\u002Fli>\n\u003Cli>Identify the likely leakage paths\u003C\u002Fli>\n\u003Cli>Provide practical airtightness design advice\u003C\u002Fli>\n\u003Cli>Reduce retest risk\u003C\u002Fli>\n\u003Cli>Create a repeatable method for future plots\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What ATSPACE Did On Site\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>1. Focused airtightness design advice walkthrough\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We followed the airtightness line through the building — not the finishes.\u003C\u002Fp>\n\u003Cp>Key areas checked:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Under‑stairs services and boxing\u003C\u002Fli>\n\u003Cli>Soil stack penetrations at floor\u002Fceiling junctions\u003C\u002Fli>\n\u003Cli>Loft hatch and ceiling penetrations\u003C\u002Fli>\n\u003Cli>Meter cupboard interfaces\u003C\u002Fli>\n\u003Cli>Kitchen\u002Futility penetrations behind units\u003C\u002Fli>\n\u003Cli>Party wall junctions (1st & 2nd floors)\u003C\u002Fli>\n\u003Cli>Bathroom\u002Fensuite pipe boxing\u003C\u002Fli>\n\u003Cli>External door thresholds and internal seal continuity\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>2. Identify the leakage routes most likely to move the result\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Three issues were driving the risk:\u003C\u002Fp>\n\u003Cp>\u003Cstrong>1) Soil stack and waste routes\u003C\u002Fstrong>\u003Cbr>Boxing present, airtight layer not continuous behind it.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>2) Meter\u002Fconsumer unit zone\u003C\u002Fstrong>\u003Cbr>Incoming services had gaps hidden behind the cupboard.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>3) Loft hatch\u003C\u002Fstrong>\u003Cbr>Seal compression inconsistent — visually good but likely to leak under pressure.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>3. Provide clear close‑out actions (not generic advice)\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Actions tailored to what the trades could do immediately:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Seal the airtight layer behind boxing, not just at visible edges\u003C\u002Fli>\n\u003Cli>Close gaps around services before finishes blocked access\u003C\u002Fli>\n\u003Cli>Improve loft hatch seal compression and closure pressure\u003C\u002Fli>\n\u003Cli>Seal behind meter cupboards and around incoming services\u003C\u002Fli>\n\u003Cli>Recheck critical junctions after late M&E works\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>4. Recheck before the test slot\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Once close‑outs were done, we reviewed the critical points again — avoiding last‑minute surprises.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Problems Faced On Site (And How They Were Handled)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Problem 1: Trades assumed boxing = airtight\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> New rule — anything boxed must be sealed behind before closure.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Problem 2: Incoming services fell between trades\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> A named owner for service entry close‑out + added checks before test booking.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Problem 3: Loft hatch performance not being physically checked\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong> Team added compression\u002Fclosure pressure checks — not visual only.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Outcome\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Plot 17 passed its airtightness test first time.\u003C\u002Fp>\n\u003Cp>Just as important, the team gained a repeatable method for similar plots.\u003C\u002Fp>\n\u003Cp>Measured outcomes:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>No failed test\u003C\u002Fli>\n\u003Cli>No retest delay\u003C\u002Fli>\n\u003Cli>No disruption to finishing trades\u003C\u002Fli>\n\u003Cli>A clear set of repeatable close‑out checks\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What This Proves\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>On‑site airtightness design advice works because airtightness fails at \u003Cstrong>interfaces\u003C\u002Fstrong>, not on drawings.\u003C\u002Fp>\n\u003Cp>Identifying leakage routes early avoids:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Programme delay\u003C\u002Fli>\n\u003Cli>Costly rework\u003C\u002Fli>\n\u003Cli>Access loss\u003C\u002Fli>\n\u003Cli>Repeat defects\u003C\u002Fli>\n\u003Cli>Trade conflict\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Common Mistakes This Project Avoided\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>Booking tests based on appearance, not readiness\u003C\u002Fli>\n\u003Cli>Leaving boxing close‑out until after a failure\u003C\u002Fli>\n\u003Cli>Assuming fire stopping = airtight\u003C\u002Fli>\n\u003Cli>Treating loft hatches as minor\u003C\u002Fli>\n\u003Cli>Allowing late penetrations without resealing\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If you have a plot approaching test day and you’re not confident it will pass, ATSPACE can provide on‑site airtightness design advice to identify leakage risks early.\u003C\u002Fp>\n\u003Cp>Ask for:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>On‑site airtightness design advice visits\u003C\u002Fli>\n\u003Cli>Readiness checks before test booking\u003C\u002Fli>\n\u003Cli>Repeatable close‑out guidance for house types\u003C\u002Fli>\n\u003Cli>Support to increase first‑time pass rates\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently Asked Questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>What is on‑site airtightness design advice?\u003C\u002Fstrong>\u003Cbr>Practical guidance to help maintain a continuous airtight layer before testing.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>When is the best time to bring in airtightness design advice?\u003C\u002Fstrong>\u003Cbr>Before test day — ideally while junctions are still accessible.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Why do individual plots fail airtightness tests?\u003C\u002Fstrong>\u003Cbr>Hidden service penetrations, meter cupboard gaps, loft hatch sealing, and boxing that hides rather than seals leaks.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Does design advice reduce retests across the site?\u003C\u002Fstrong>\u003Cbr>Yes — especially when fixes are applied across multiple similar plots.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Can ATSPACE support after a failure too?\u003C\u002Fstrong>\u003Cbr>Yes. 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