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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 contractor had a plot showing persistent leakage, but repeated snagging didn’t reveal anything obvious. Time was being lost, confidence was fading, and every fix felt like guesswork.\u003Cbr>ATSPACE carried out \u003Cstrong>smoke pencil testing under controlled pressure\u003C\u002Fstrong>, traced the real hidden leak routes through connected voids, and produced a short, targeted remedial list.\u003Cbr>The fixes worked because they stopped the \u003Cem>actual\u003C\u002Fem> air paths — not just the visible gaps.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Project Snapshot\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Service:\u003C\u002Fstrong> Diagnostic smoke testing\u003Cbr>\u003Cstrong>Client:\u003C\u002Fstrong> Principal contractor (new build housing)\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> The Willows, Plot 31, 5 Alderbrook Drive, Milton Keynes MK10 7AZ\u003Cbr>\u003Cstrong>Building type:\u003C\u002Fstrong> New build 3‑bed semi‑detached\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Pre‑test snagging\u003Cbr>\u003Cstrong>Compliance driver:\u003C\u002Fstrong> Approved Document Part L\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> Controlled pressure setup, smoke tracing, leak‑path mapping, remedial plan, verification before airtightness testing\u003Cbr>\u003Cstrong>Engineers:\u003C\u002Fstrong> ATSPACE accredited test engineer + compliance coordinator\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Situation on Plot 31\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Plot 31 wasn’t failing — but it wasn’t predictable. The team felt the airtightness result was at risk because:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>earlier plots of the same type had inconsistent outcomes\u003C\u002Fli>\n\u003Cli>a busy understairs service zone contained multiple penetrations\u003C\u002Fli>\n\u003Cli>bathroom\u002Fkitchen boxing reduced access to key voids\u003C\u002Fli>\n\u003Cli>late service adjustments created new openings\u003C\u002Fli>\n\u003Cli>the plot still felt draughty even after standard snagging\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The site manager needed a fast, practical answer:\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>Where is the leakage route we are missing?\u003C\u002Fstrong>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>\u003Cstrong>Why Hidden Leaks Are Hard to Find Without Smoke\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Traditional snagging focuses on \u003Cem>visible\u003C\u002Fem> gaps.\u003Cbr>Hidden leaks are different — they usually run through connected voids:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>understairs voids\u003C\u002Fli>\n\u003Cli>service routes behind kitchen units\u003C\u002Fli>\n\u003Cli>intermediate floor penetrations\u003C\u002Fli>\n\u003Cli>loft interfaces and ceiling penetrations\u003C\u002Fli>\n\u003Cli>meter box and incoming services\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Sealing the visible edge does nothing if the \u003Cstrong>void path remains open\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Cp>Smoke pencil testing with controlled pressure shows:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>where air is actually moving\u003C\u002Fli>\n\u003Cli>the direction of travel\u003C\u002Fli>\n\u003Cli>whether voids connect to external pathways\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>This is what reveals the \u003Cem>real\u003C\u002Fem> leakage routes.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What ATSPACE Did\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Step 1: Confirm likely leak zones\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Based on the house type, we prioritised the usual problem areas:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>understairs\u002Fservice zones\u003C\u002Fli>\n\u003Cli>meter area\u003C\u002Fli>\n\u003Cli>bathroom boxing\u003C\u002Fli>\n\u003Cli>ceiling\u002Floft interfaces\u003C\u002Fli>\n\u003Cli>thresholds\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 2: Apply controlled pressure\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Stable pressure ensures smoke behaves clearly and does not mislead.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 3: Smoke pencil tracing — structured, not random\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Zones tested included:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>meter cupboard + service entries\u003C\u002Fli>\n\u003Cli>understairs penetrations + boxing\u003C\u002Fli>\n\u003Cli>kitchen\u002Futility service routes\u003C\u002Fli>\n\u003Cli>soil stack penetration (floor + ceiling)\u003C\u002Fli>\n\u003Cli>bathroom boxing penetrations\u003C\u002Fli>\n\u003Cli>loft hatch compression + ceiling penetrations\u003C\u002Fli>\n\u003Cli>external door thresholds + frames\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>\u003Cstrong>Step 4: Follow the air path back to source\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Smoke shows \u003Cem>where it appears\u003C\u002Fem>, not always where it \u003Cem>originates\u003C\u002Fem>.\u003Cbr>We traced each path back to the actual leakage source.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 5: Provide a targeted remedial list\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>We issued a short set of high‑impact actions and verified the fixes before the airtightness test.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What Snagging Missed — The Hidden Leak Routes\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Hidden Route 1: Understairs void → incoming service path\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Why it mattered:\u003C\u002Fstrong>\u003Cbr>Sealing skirtings does nothing — the leak was through a connected void.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong>\u003Cbr>Seal service entry properly and close void interfaces.\u003C\u002Fp>\n\u003Chr>\n\u003Ch3>\u003Cstrong>Hidden Route 2: Soil stack penetration at intermediate floor\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Why it mattered:\u003C\u002Fstrong>\u003Cbr>Intermediate floor penetrations often act as multi‑storey void routes.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong>\u003Cbr>Seal the floor‑zone penetration and ensure continuity around the stack.\u003C\u002Fp>\n\u003Chr>\n\u003Ch3>\u003Cstrong>Hidden Route 3: Ceiling penetration into loft zone\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Why it mattered:\u003C\u002Fstrong>\u003Cbr>Loft interfaces become large leakage volumes under pressure.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong>\u003Cbr>Standardise sealing, check loft hatch compression, confirm closure pressure.\u003C\u002Fp>\n\u003Chr>\n\u003Ch3>\u003Cstrong>Hidden Route 4: Meter cupboard rear interface\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Why it mattered:\u003C\u002Fstrong>\u003Cbr>A very common leak point — often falling between trades.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Fix:\u003C\u002Fstrong>\u003Cbr>Seal the rear interface and all service entries consistently.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>The Outcome\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The key benefit was \u003Cstrong>speed and confidence\u003C\u002Fstrong>.\u003C\u002Fp>\n\u003Cp>The site team gained:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>clear evidence of the actual leaks\u003C\u002Fli>\n\u003Cli>a short remedial list that worked\u003C\u002Fli>\n\u003Cli>reduced risk of wasting the airtightness test slot\u003C\u002Fli>\n\u003Cli>repeatable learning for future plots\u003C\u002Fli>\n\u003Cli>far less time wasted on guesswork\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>What This Proves\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>When a team says “we can’t find it,” the leak is almost always in a \u003Cstrong>connected void path\u003C\u002Fstrong>, not a visible gap.\u003C\u002Fp>\n\u003Cp>Smoke pencil testing with controlled pressure is one of the fastest, most reliable ways to trace hidden air‑leakage routes and fix them properly.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Common Mistakes This Project Avoided\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>adding more sealant to visible trims without tracing the source\u003C\u002Fli>\n\u003Cli>spending time on low‑impact gaps while missing connected void paths\u003C\u002Fli>\n\u003Cli>booking an air test without verifying dominant leaks\u003C\u002Fli>\n\u003Cli>treating meter cupboards\u002Funderstairs zones as minor details\u003C\u002Fli>\n\u003Cli>allowing late penetrations without immediate reseal\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If you have a plot behaving unpredictably and snagging isn’t finding the cause, ATSPACE diagnostic smoke testing will trace the hidden air path and give you a targeted remedial plan that works.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Ask for:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>smoke pencil testing with controlled pressure\u003C\u002Fli>\n\u003Cli>diagnostic leak tracing for Part L\u003C\u002Fli>\n\u003Cli>prioritised remedial actions\u003C\u002Fli>\n\u003Cli>verification before final airtightness testing\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently Asked Questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>What is a smoke pencil used for on site?\u003C\u002Fstrong>\u003Cbr>To visualise airflow and trace hidden leakage routes through voids and gaps.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Does smoke testing replace an airtightness test?\u003C\u002Fstrong>\u003Cbr>No. It is a pre‑test diagnostic tool that increases your chance of passing first time.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>When is the best time to use smoke testing?\u003C\u002Fstrong>\u003Cbr>Before final finishes, ideally just before the airtightness test window.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Can smoke testing identify leaks behind boxing and units?\u003C\u002Fstrong>\u003Cbr>Often yes. Controlled pressure helps identify connected air paths even when the source is hidden.\u003C\u002Fp>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>\n\u003C\u002Fdiv>","py-7","px-5","2026-03-26T12:27:37.000000Z","2026-03-31T10:34:22.000000Z",{"id":160,"user_id":245,"parent_id":7,"page_type_id":7,"linked_page_id":7,"title":246,"slug":247,"full_url":248,"live":11,"data_model":249,"created_at":250,"updated_at":250,"text_content_only":251,"html_content_only":251,"is_homepage":8,"is_template":8,"is_password_protected":8,"page_password":7,"parent":7},1,"Case 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