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ATSPACE was brought in to run diagnostic testing, identify the dominant leak routes, and pinpoint the real cause behind the failure. The site then completed targeted remedial sealing and passed on retest — without weeks of disruption.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project Snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Diagnostic air leakage testing\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Main contractor\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> Willow Court, Plot 17, 23 Rowan Drive, Banbury OX16 4BX\u003Cbr>\u003Cstrong>Building type:\u003C\u002Fstrong> New build 3‑storey townhouse\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Post‑fail remedial window\u003Cbr>\u003Cstrong>Compliance driver:\u003C\u002Fstrong> Approved Document Part L\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> Diagnostic investigation, leak path mapping, remedial plan, retest readiness check\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Problem After the Failure\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>After the plot failed, the team followed the usual steps:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>sealed visible gaps\u003C\u002Fli>\n\u003Cli>checked the loft hatch\u003C\u002Fli>\n\u003Cli>added sealant around skirtings and trims\u003C\u002Fli>\n\u003Cli>adjusted door seals\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>But the result did not improve enough.\u003C\u002Fp>\n\u003Cp>This is common: the biggest leaks are \u003Cem>not\u003C\u002Fem> the visible ones — they are hidden through voids and junction lines.\u003C\u002Fp>\n\u003Cp>The client needed:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>a clear explanation of \u003Cstrong>why it failed\u003C\u002Fstrong>\u003C\u002Fli>\n\u003Cli>a remedial plan that would \u003Cstrong>actually move the result\u003C\u002Fstrong>\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Why Plots Fail (And Why Quick Fixes Don’t Work)\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Airtightness failures usually come from a few dominant leakage routes:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>open service entry routes\u003C\u002Fli>\n\u003Cli>void bypass paths from external wall into internal zones\u003C\u002Fli>\n\u003Cli>intermediate floor penetrations around stacks\u002Fducts\u003C\u002Fli>\n\u003Cli>breaks in continuity at party wall junctions\u003C\u002Fli>\n\u003Cli>meter box and consumer unit interfaces\u003C\u002Fli>\n\u003Cli>loft and ceiling penetrations\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>If you don’t find the \u003Cstrong>dominant\u003C\u002Fstrong> path, endless sealing won’t work.\u003Cbr>Diagnostic testing stops that cycle.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>How ATSPACE Carried Out the Diagnostic Investigation\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Review original test context\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We reviewed:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>the original test setup\u003C\u002Fli>\n\u003Cli>configuration of the plot at time of test\u003C\u002Fli>\n\u003Cli>what had changed since\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>This prevents chasing the wrong cause.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 2: Apply controlled pressure and map leakage\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We traced airflow through:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>service zones and cupboards\u003C\u002Fli>\n\u003Cli>intermediate floors\u003C\u002Fli>\n\u003Cli>loft and ceiling interfaces\u003C\u002Fli>\n\u003Cli>wet rooms and boxing\u003C\u002Fli>\n\u003Cli>thresholds and openings\u003C\u002Fli>\n\u003Cli>party wall junctions\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Paths were followed to the actual source.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 3: Identify dominant leak routes\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We separated background leakage from the paths that actually influence the test result.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 4: Issue a targeted remedial plan\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Clear, trade‑owned actions — not vague instructions.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 5: Retest readiness check\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Before retest, we confirmed remedials were complete and no new penetrations had reopened the leak path.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What Caused the Failure on Plot 17\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Root cause: A continuous air path through a service void into the loft zone\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Air entered through an \u003Cstrong>external service entry\u003C\u002Fstrong>, travelled through a connected void, then discharged through:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>ceiling penetrations\u003C\u002Fli>\n\u003Cli>loft interfaces\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Why it caused failure\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>It wasn’t a single hole — it was a \u003Cstrong>bypass route\u003C\u002Fstrong> that created strong airflow under pressure.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Why the first snagging didn’t work\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Because:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>skirting sealant\u003C\u002Fli>\n\u003Cli>trim sealing\u003C\u002Fli>\n\u003Cli>visible gap filling\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>…did nothing to break the hidden void pathway.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Remedial Works That Fixed the Real Problem\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Focused on breaking the \u003Cstrong>actual air path\u003C\u002Fstrong>, not the symptoms.\u003C\u002Fp>\n\u003Cp>Actions completed:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>sealed the external service entry as part of the airtight layer\u003C\u002Fli>\n\u003Cli>sealed void interfaces to stop air tracking between floors\u003C\u002Fli>\n\u003Cli>sealed ceiling penetrations where the path discharged\u003C\u002Fli>\n\u003Cli>confirmed loft hatch seal compression\u003C\u002Fli>\n\u003Cli>rechecked junctions after final service works\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>These were targeted — \u003Cstrong>no major strip‑out required\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Retest Outcome\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The plot \u003Cstrong>passed\u003C\u002Fstrong> on retest.\u003C\u002Fp>\n\u003Cp>The site gained:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>a controlled and predictable recovery\u003C\u002Fli>\n\u003Cli>fewer wasted hours on ineffective snagging\u003C\u002Fli>\n\u003Cli>reduced programme risk\u003C\u002Fli>\n\u003Cli>a repeatable method for similar plots\u003C\u002Fli>\n\u003Cli>clear close‑out rules for service void interfaces\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What This Project Proves\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>A failed airtightness test isn’t a disaster — but guessing makes it worse.\u003C\u002Fp>\n\u003Cp>Diagnostic testing \u003Cstrong>shortens the recovery\u003C\u002Fstrong> because it finds the real leakage path.\u003C\u002Fp>\n\u003Cp>Fastest recoveries happen when:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>dominant air paths are found quickly\u003C\u002Fli>\n\u003Cli>remedials are targeted\u003C\u002Fli>\n\u003Cli>readiness is verified before retesting\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Common Mistakes After a Failed Air Test\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>sealing only visible areas\u003C\u002Fli>\n\u003Cli>ignoring void pathways\u003C\u002Fli>\n\u003Cli>booking retest without verifying the real cause\u003C\u002Fli>\n\u003Cli>allowing new penetrations to reopen failures\u003C\u002Fli>\n\u003Cli>assuming the loft hatch is always the issue\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If a plot has failed its airtightness test and you need a fast recovery, ATSPACE diagnostic testing will identify the real cause, provide a targeted remedial plan, and protect your retest slot.\u003C\u002Fp>\n\u003Cp>Ask for:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>diagnostic testing after failed airtightness\u003C\u002Fli>\n\u003Cli>leak path mapping + prioritised remedial plans\u003C\u002Fli>\n\u003Cli>retest readiness checks\u003C\u002Fli>\n\u003Cli>practical support to prevent repeat failures\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently Asked Questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Why do plots fail airtightness even when they look finished?\u003C\u002Fstrong>\u003Cbr>Because dominant leak routes are often behind voids, units or boxing — visually complete but not airtight.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>What is the fastest recovery approach?\u003C\u002Fstrong>\u003Cbr>Find the dominant leak paths and fix those. 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