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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 homeowner invested in insulation upgrades but wanted evidence that the work delivered \u003Cem>real\u003C\u002Fem> performance improvement. ATSPACE carried out an air leakage test after the upgrade and compared the result to the pre‑works baseline. We also identified the remaining dominant leakage routes so the client could decide whether further improvements were worthwhile.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Measured improvement:\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Before insulation upgrade:\u003C\u002Fstrong> 10.2 m³\u002Fh·m² @ 50 Pa\u003C\u002Fli>\n\u003Cli>\u003Cstrong>After insulation upgrade:\u003C\u002Fstrong> 6.0 m³\u002Fh·m² @ 50 Pa\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>The key point: improvement was measurable, and the remaining leaks were identified, prioritised and easy for the homeowner to understand.\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 installer\u003Cbr>\u003Cstrong>Site:\u003C\u002Fstrong> 41 Brookside Road, Aylsham, Norwich NR11 6GH\u003Cbr>\u003Cstrong>Property type:\u003C\u002Fstrong> 1980s end terrace\u003Cbr>\u003Cstrong>Construction:\u003C\u002Fstrong> Cavity walls, concrete ground floor slab, pitched roof\u003Cbr>\u003Cstrong>Retrofit works:\u003C\u002Fstrong> Cavity wall insulation top‑up, loft insulation upgrade, draught‑proofing, new external doors\u003Cbr>\u003Cstrong>Programme stage:\u003C\u002Fstrong> Baseline test → verification test\u003Cbr>\u003Cstrong>ATSPACE delivery:\u003C\u002Fstrong> Baseline blower‑door test, post‑works blower‑door test, diagnostic checks, reporting for homeowner\u002Finstaller\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Why Testing After Insulation Matters\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>Insulation reduces heat loss — but it \u003Cstrong>does not\u003C\u002Fstrong> automatically reduce uncontrolled air leakage.\u003C\u002Fp>\n\u003Cp>Many retrofits still feel drafty because air leaks in through:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>gaps\u003C\u002Fli>\n\u003Cli>void pathways\u003C\u002Fli>\n\u003Cli>ceiling penetrations\u003C\u002Fli>\n\u003Cli>service routes\u003C\u002Fli>\n\u003Cli>older door interfaces\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Testing after insulation matters because it:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>proves real change instead of guesswork\u003C\u002Fli>\n\u003Cli>supports installer quality assurance\u003C\u002Fli>\n\u003Cli>identifies what is still leaking\u003C\u002Fli>\n\u003Cli>reduces risk of comfort complaints\u003C\u002Fli>\n\u003Cli>helps homeowners understand the difference between \u003Cstrong>insulation\u003C\u002Fstrong> and \u003Cstrong>airtightness\u003C\u002Fstrong>\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>This homeowner wanted a clear answer:\u003Cbr>\u003Cstrong>“Did the upgrade actually make the home tighter?”\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Baseline Issues Before the Upgrade\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>The homeowner reported:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>drafts around back door\u002Fkitchen\u003C\u002Fli>\n\u003Cli>cold movement on the first‑floor landing\u003C\u002Fli>\n\u003Cli>the loft feeling like it was pulling air through the house\u003C\u002Fli>\n\u003Cli>heating struggling to stabilise temperatures in wind\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>These symptoms often indicate connected air paths between loft, doors, ceilings and service routes.\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>\u003Cstrong>Result:\u003C\u002Fstrong> 10.2 m³\u002Fh·m² @ 50 Pa\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 2: Post‑insulation blower‑door test\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>\u003Cstrong>Result:\u003C\u002Fstrong> 6.0 m³\u002Fh·m² @ 50 Pa\u003Cbr>A strong improvement — proving the retrofit delivered more than just insulation on paper.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Step 3: Identify remaining leak routes\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>The homeowner wanted to know whether further improvements were worthwhile.\u003C\u002Fp>\n\u003Cp>Remaining dominant leak paths:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>back‑door threshold + frame line\u003C\u002Fli>\n\u003Cli>loft hatch and ceiling‑penetration leakage\u003C\u002Fli>\n\u003Cli>kitchen service penetrations linked to external walls\u003C\u002Fli>\n\u003Cli>first‑floor ceiling\u002Floft interface above landing\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>We explained which fixes were low‑effort “quick wins” and which would be more intrusive.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>What Changed Because the Retrofit Was Proven\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>1. The homeowner gained confidence\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>The numbers confirmed real performance improvement.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>2. The installer gained assurance\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>The before\u002Fafter data showed the work delivered measurable benefit.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>3. Next steps became obvious\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>A short, prioritised list replaced vague snagging suggestions.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Practical Takeaways from This Retrofit\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Ch3>\u003Cstrong>Takeaway 1: Insulation ≠ airtightness\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>You can insulate a home and still leak air badly — testing proves what's actually changed.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Takeaway 2: Doors + loft interfaces are common remaining leaks\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Even after insulation, thresholds and ceiling penetrations often remain the biggest leakage points.\u003C\u002Fp>\n\u003Ch3>\u003Cstrong>Takeaway 3: Verification prevents disappointment\u003C\u002Fstrong>\u003C\u002Fh3>\n\u003Cp>Without a post‑test, the homeowner might still feel drafts and assume the upgrade “did nothing”.\u003C\u002Fp>\n\u003Ch2>\u003Cstrong>Common Mistakes This Project Avoided\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cul>\n\u003Cli>assuming insulation upgrades automatically fix drafts\u003C\u002Fli>\n\u003Cli>not verifying the final outcome\u003C\u002Fli>\n\u003Cli>spending money on broad snagging instead of targeted fixes\u003C\u002Fli>\n\u003Cli>overlooking door and loft leakage points\u003C\u002Fli>\n\u003Cli>improving airtightness without considering ventilation needs\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>CTA\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>If you've completed insulation or energy upgrades and want proof that the retrofit delivered real performance change, ATSPACE provides:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>before + after blower‑door testing\u003C\u002Fli>\n\u003Cli>air leakage testing after insulation\u003C\u002Fli>\n\u003Cli>diagnostic checks to identify remaining leaks\u003C\u002Fli>\n\u003Cli>reporting for homeowner records or installer sign‑off\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2>\u003Cstrong>Frequently Asked Questions\u003C\u002Fstrong>\u003C\u002Fh2>\n\u003Cp>\u003Cstrong>Should I test before and after an insulation upgrade?\u003C\u002Fstrong>\u003Cbr>Yes — it proves improvement and gives context.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Will insulation always improve airtightness?\u003C\u002Fstrong>\u003Cbr>Not necessarily — many leaks are at junctions, not in insulated areas.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>What if the after‑test result is still high?\u003C\u002Fstrong>\u003Cbr>We can identify dominant leaks and explain which are worth fixing.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>How long does a retrofit blower‑door test take?\u003C\u002Fstrong>\u003Cbr>Usually a short visit with testing + results discussed on site.\u003C\u002Fp>\n\u003Cp>\u003Cstrong>Can airtightness improvements cause moisture issues?\u003C\u002Fstrong>\u003Cbr>Only if ventilation is ignored — both must work 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