{"title":"Acoustic Glass Units","description":"\u003cstyle\u003e\n  .pr-cag { max-width: 1140px; margin: 0 auto; padding: 0 16px; color: var(--pr-text, #1f2933); font-family: var(--pr-font-body, inherit); }\n  .pr-cag * { box-sizing: border-box; }\n  .pr-cag__hero { padding: 28px 0 12px; }\n  .pr-cag__hero h2 { font-size: 26px; margin: 0 0 10px; color: var(--pr-text, #1f2933); font-family: var(--pr-font-heading, inherit); }\n  .pr-cag__hero p { font-size: 17px; line-height: 1.6; margin: 0 0 12px; color: var(--pr-text-body, #1f2933); }\n  .pr-cag__hero strong { color: var(--pr-text, #1f2933); }\n  .pr-cag__personas { display: grid; grid-template-columns: 1fr; gap: 16px; padding: 12px 0 28px; }\n  @media (min-width: 720px) { .pr-cag__personas { grid-template-columns: 1fr 1fr; } }\n  .pr-cag__persona { border: 1px solid var(--pr-border-light, #e5e7eb); border-radius: var(--pr-radius-lg, 14px); padding: 24px; background: var(--pr-bg-white, #fff); box-shadow: var(--pr-shadow-sm, 0 1px 2px rgba(0,0,0,0.04)); 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}\n  .pr-cag__info-card a:hover { text-decoration: underline; }\n  .pr-cag__measure ol { margin: 8px 0 0; padding-left: 22px; line-height: 1.6; font-size: 14px; color: var(--pr-text-body, #374151); }\n  .pr-cag__measure ol li + li { margin-top: 4px; }\n  .pr-cag__faq { padding: 24px 0; }\n  .pr-cag__faq h2 { font-size: 22px; margin: 0 0 14px; color: var(--pr-text, #1f2933); font-family: var(--pr-font-heading, inherit); }\n  .pr-cag__faq-item { border-bottom: 1px solid var(--pr-border-light, #e5e7eb); padding: 14px 0; }\n  .pr-cag__faq-item:last-child { border-bottom: none; }\n  .pr-cag__faq-item h3 { font-size: 16px; margin: 0 0 6px; color: var(--pr-text, #1f2933); font-weight: 600; }\n  .pr-cag__faq-item p { margin: 0; line-height: 1.6; font-size: 14px; color: var(--pr-text-body, #374151); }\n  .pr-cag__crosslinks { padding: 24px 0; }\n  .pr-cag__crosslinks h2 { font-size: 20px; margin: 0 0 12px; color: var(--pr-text, #1f2933); }\n  .pr-cag__chip-row { display: flex; flex-wrap: wrap; gap: 8px; }\n  .pr-cag__chip { display: inline-block; padding: 8px 14px; background: var(--pr-bg-light, #f9fafb); border: 1px solid var(--pr-border-light, #e5e7eb); border-radius: var(--pr-radius-full, 999px); color: var(--pr-text, #1f2933); text-decoration: none; font-size: 13px; font-weight: 500; transition: background 0.15s, border-color 0.15s; }\n  .pr-cag__chip:hover { background: var(--pr-bg-white, #fff); border-color: var(--pr-accent, #D98E04); color: var(--pr-accent, #D98E04); }\n  .pr-cag__sticky-cta { margin: 12px 0 36px; padding: 20px 24px; background: var(--pr-text, #1f2933); color: #fff; border-radius: var(--pr-radius-lg, 14px); display: grid; grid-template-columns: 1fr; gap: 12px; align-items: center; }\n  @media (min-width: 720px) { .pr-cag__sticky-cta { grid-template-columns: 1fr auto; } }\n  .pr-cag__sticky-cta h3 { margin: 0 0 4px; font-size: 17px; color: #fff; }\n  .pr-cag__sticky-cta p { margin: 0; font-size: 14px; line-height: 1.5; color: #e5e7eb; }\n  .pr-cag__sticky-cta a { color: var(--pr-accent, #D98E04); font-weight: 600; text-decoration: none; }\n  .pr-cag__sticky-cta a:hover { text-decoration: underline; }\n  .pr-cag__sticky-cta .pr-cag__btn { background: var(--pr-accent, #D98E04); color: #fff; align-self: stretch; text-align: center; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"pr-cag\"\u003e\n\n  \u003csection class=\"pr-cag__hero\"\u003e\n    \u003ch2\u003eAcoustic glass — Rw up to 44 dB, railway \/ flight-path \/ A-road territory\u003c\/h2\u003e\n    \u003cp\u003e\u003cstrong\u003eIf you can hear individual cars from inside your front room, you've got a glazing problem — not a wall problem.\u003c\/strong\u003e Standard 4-16-4 double glazing achieves around 30 dB Rw; that's enough for a quiet suburban street but nothing more. Add asymmetric panes, a wider cavity, and an acoustic-PVB laminated inner pane, and the same window can hit 38 dB, 42 dB, or 44 dB — taking a busy A-road from intrusive conversation-blocker to background hum. Pane Relief manufactures the full acoustic range — laminated acoustic-PVB sealed units, asymmetric double-glazed builds, and triple-glazed acoustic stacks — to \u003cstrong\u003eBS EN 12758\u003c\/strong\u003e and BS EN ISO 10140 lab-measured Rw values. Tell us your noise source (traffic, train, plane, plant) and we'll spec the right curve for the frequency.\u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pr-cag__personas\"\u003e\n    \u003cdiv class=\"pr-cag__persona\"\u003e\n      \u003cspan class=\"pr-cag__persona-tag\"\u003eHomeowner\u003c\/span\u003e\n      \u003ch3\u003eYou can't sleep through the noise\u003c\/h3\u003e\n      \u003cp\u003eFlight path, freight line, motorway, late-night main road, neighbour's plant equipment. We've spec'd acoustic units for every flavour of noise problem in the UK. Free UK delivery, 10-year edge-seal warranty, and a phone helpline (08:00-18:00 Mon-Fri) for a free dB-target conversation before you order.\u003c\/p\u003e\n      \u003ca class=\"pr-cag__btn\" href=\"\/pages\/configure\"\u003eConfigure acoustic unit\u003c\/a\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pr-cag__persona\"\u003e\n      \u003cspan class=\"pr-cag__persona-tag\"\u003eSpecifier\u003c\/span\u003e\n      \u003ch3\u003eArchitect, M\u0026amp;E, planning condition\u003c\/h3\u003e\n      \u003cp\u003eBS 8233 dwelling internal-noise targets, planning-condition acoustic specs (typical: 35 dB Rw glazing for residential near A-roads, 38-42 dB Rw near rail and flight paths), schools, hotels, healthcare. Lab-measured Rw + spectrum-adapted C\/Ctr values on every build, BS EN 12758 documentation, scheduled site delivery.\u003c\/p\u003e\n      \u003ca class=\"pr-cag__btn pr-cag__btn--ghost\" href=\"\/pages\/bulk-orders\"\u003eTrade \u0026amp; specifier pricing\u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pr-cag__section\"\u003e\n    \u003ch2\u003eMatch the dB target to the build\u003c\/h2\u003e\n    \u003cp class=\"pr-cag__lede\"\u003eRw values are \u003cem\u003elab\u003c\/em\u003e-measured for the glass alone. Real-world site performance loses 2-4 dB to frame leakage and trickle vents. Aim 4 dB above your target.\u003c\/p\u003e\n    \u003cdiv class=\"pr-cag__finder\"\u003e\n      \u003ca class=\"pr-cag__tile\" href=\"\/collections\/acoustic-double-glazing\"\u003e\n        \u003cspan class=\"pr-cag__tile-icon\" aria-hidden=\"true\"\u003e\u003csvg width=\"28\" height=\"28\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"\u003e\u003cpath d=\"M11 5L6 9H2v6h4l5 4V5z\"\u003e\u003c\/path\u003e\u003cline x1=\"23\" y1=\"9\" x2=\"17\" y2=\"15\"\u003e\u003c\/line\u003e\u003cline x1=\"17\" y1=\"9\" x2=\"23\" y2=\"15\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\n        \u003ch3\u003e38 dB Rw — entry-point\u003c\/h3\u003e\n        \u003cp\u003eAsymmetric 6-16-4 DG with standard PVB inner. The default upgrade from standard 30 dB stock DG. Most domestic noise.\u003c\/p\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pr-cag__tile\" href=\"\/collections\/acoustic-double-glazing\"\u003e\n        \u003cspan class=\"pr-cag__tile-icon\" aria-hidden=\"true\"\u003e\u003csvg width=\"28\" height=\"28\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"\u003e\u003cpath d=\"M11 5L6 9H2v6h4l5 4V5z\"\u003e\u003c\/path\u003e\u003cline x1=\"23\" y1=\"9\" x2=\"17\" y2=\"15\"\u003e\u003c\/line\u003e\u003cline x1=\"17\" y1=\"9\" x2=\"23\" y2=\"15\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\n        \u003ch3\u003e40 dB Rw — A-road\u003c\/h3\u003e\n        \u003cp\u003eAsymmetric 6.4-20-4 with acoustic-PVB laminated outer. Direct exposure to a busy through-road.\u003c\/p\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pr-cag__tile\" href=\"\/products\/acoustic-double-glazed-unit\"\u003e\n        \u003cspan class=\"pr-cag__tile-icon\" aria-hidden=\"true\"\u003e\u003csvg width=\"28\" height=\"28\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"\u003e\u003cpath d=\"M11 5L6 9H2v6h4l5 4V5z\"\u003e\u003c\/path\u003e\u003cline x1=\"23\" y1=\"9\" x2=\"17\" y2=\"15\"\u003e\u003c\/line\u003e\u003cline x1=\"17\" y1=\"9\" x2=\"23\" y2=\"15\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\n        \u003ch3\u003e42 dB Rw — rail \/ dual\u003c\/h3\u003e\n        \u003cp\u003e10.8-20-4 with thicker acoustic-PVB. Mainline rail, motorway frontage, dual-carriageway.\u003c\/p\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pr-cag__tile\" href=\"\/collections\/acoustic-triple-glazing\"\u003e\n        \u003cspan class=\"pr-cag__tile-icon\" aria-hidden=\"true\"\u003e\u003csvg width=\"28\" height=\"28\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"\u003e\u003cpath d=\"M13 2L3 14h9l-1 8 10-12h-9l1-8z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\n        \u003ch3\u003e44 dB+ Rw — flight path\u003c\/h3\u003e\n        \u003cp\u003eTriple-glazed acoustic stack with two acoustic-PVB layers. Heathrow \/ Gatwick approach, freight depot perimeter.\u003c\/p\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pr-cag__tile\" href=\"\/products\/acoustic-laminated-glass\"\u003e\n        \u003cspan class=\"pr-cag__tile-icon\" aria-hidden=\"true\"\u003e\u003csvg width=\"28\" height=\"28\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"\u003e\u003cpath d=\"M2 17l5.07-5.07M6.36 12.64l2.12 2.12M9.51 9.49l1.41 1.42M12.66 6.34l2.12 2.12M15.81 3.19l2.12 2.12\"\u003e\u003c\/path\u003e\u003crect x=\"1.83\" y=\"11.17\" width=\"15.56\" height=\"5.66\" rx=\"1\" transform=\"rotate(-45 1.83 11.17)\"\u003e\u003c\/rect\u003e\u003c\/svg\u003e\u003c\/span\u003e\n        \u003ch3\u003eSingle-pane acoustic\u003c\/h3\u003e\n        \u003cp\u003eMonolithic acoustic-PVB laminated for secondary glazing, single-glazed sash conservation, partition systems.\u003c\/p\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pr-cag__tile\" href=\"\/pages\/configure\"\u003e\n        \u003cspan class=\"pr-cag__tile-icon\" aria-hidden=\"true\"\u003e\u003csvg width=\"28\" height=\"28\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"\u003e\u003ccircle cx=\"12\" cy=\"12\" r=\"10\"\u003e\u003c\/circle\u003e\u003cpath d=\"M8 12l3 3 5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\n        \u003ch3\u003eCustom spec\u003c\/h3\u003e\n        \u003cp\u003eBring your planning-condition spec, target Rw, or noise survey — we'll quote a build that hits the number.\u003c\/p\u003e\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pr-cag__section pr-cag__measure\"\u003e\n    \u003ch2\u003eThe acoustic dB-reduction math (in plain English)\u003c\/h2\u003e\n    \u003cp class=\"pr-cag__lede\"\u003eDecibels are logarithmic. Every 10 dB reduction \u003cem\u003ehalves\u003c\/em\u003e the subjective loudness. A 38 dB unit doesn't sound 27% quieter than a 30 dB unit — it sounds noticeably less than half.\u003c\/p\u003e\n    \u003cdiv class=\"pr-cag__info\"\u003e\n      \u003cdiv class=\"pr-cag__info-card\"\u003e\n        \u003ch3\u003eWhat changes Rw — the three levers\u003c\/h3\u003e\n        \u003col\u003e\n          \u003cli\u003e\n\u003cstrong\u003ePane thickness asymmetry.\u003c\/strong\u003e 4-16-4 has matched resonance frequencies — sound passes through. 6-16-4 mismatches them and adds 3-4 dB.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eAcoustic-PVB laminate.\u003c\/strong\u003e A tri-layer viscoelastic interlayer (Saflex Q-series, Trosifol SC) damps the coincidence dip around 2-3 kHz — adds 3-6 dB on the same glass build.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eCavity width.\u003c\/strong\u003e 20mm cavity outperforms 16mm acoustically (the reverse of thermal). 24mm cavity adds another 1-2 dB. Beyond 30mm the curve flattens.\u003c\/li\u003e\n        \u003c\/ol\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"pr-cag__info-card\"\u003e\n        \u003ch3\u003eLaminated DG vs triple — when does triple win?\u003c\/h3\u003e\n        \u003cp\u003eFor traffic and speech noise (the 500 Hz-2 kHz band where most pain lives), \u003cstrong\u003eacoustic-PVB laminated DG matches or beats triple\u003c\/strong\u003e — it's lighter, lower-cost, and the right answer 70-80% of the time. Triple wins where the noise has strong low-frequency content (large trucks, train rumble, aircraft jet roar) because the third pane and second cavity extend the damping at 50-250 Hz. For Heathrow approach lines, triple acoustic is the gold standard.\u003c\/p\u003e\n        \u003cp\u003e\u003ca href=\"\/collections\/acoustic-triple-glazing\"\u003eSee acoustic triple glazing →\u003c\/a\u003e\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pr-cag__faq\"\u003e\n    \u003ch2\u003eAcoustic glass — common questions answered\u003c\/h2\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: How much quieter will it actually sound?\u003c\/h3\u003e\n      \u003cp\u003eHonest answer: depends on the noise spectrum and the rest of the building envelope. Going from a 30 dB Rw standard unit to a 38 dB Rw acoustic unit on a typical residential window gives a \u003cstrong\u003esubjective halving of perceived loudness\u003c\/strong\u003e — sleep through the freight train, hold a phone call beside the window, don't notice the late-night traffic as background noise. Going from 38 dB to 44 dB triple is another perceived halving. \u003cstrong\u003eBut\u003c\/strong\u003e: trickle vents, letter boxes, chimney flues, and gappy front doors all flank the glazing — fix those at the same time or the windows over-perform relative to the room.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: What's the difference between Rw, Rw+C, and Rw+Ctr?\u003c\/h3\u003e\n      \u003cp\u003eRw is the single-number rating averaged across the full speech\/music spectrum. \u003cstrong\u003eC\u003c\/strong\u003e (spectrum adaptation term) re-weights for pink-noise \/ general speech \/ aircraft. \u003cstrong\u003eCtr\u003c\/strong\u003e re-weights for low-frequency dominant noise (traffic, train rumble, music bass). For a window facing a busy road, look at \u003cstrong\u003eRw+Ctr\u003c\/strong\u003e — it's typically 5-7 dB lower than Rw. An \"Rw 42 dB\" unit might be \"Rw+Ctr 36 dB\" against road traffic. We surface both numbers on the spec sheet.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: Will acoustic glass also help with thermal performance?\u003c\/h3\u003e\n      \u003cp\u003eYes, partially — but the optimisation is different. Thermal performance loves a 16mm cavity (the dead-air sweet spot for argon convection); acoustic performance loves 20-24mm. Thermal loves matched panes; acoustic loves asymmetry. The compromise spec — \u003cstrong\u003e6.4mm acoustic-PVB outer + 16mm argon cavity + 4mm low-E inner\u003c\/strong\u003e — gives around 40 dB Rw and a 1.3 W\/m²K U-value, which hits both Approved Document L energy and Approved Document E noise targets in one unit. The configurator will quote this as the default \"acoustic + low-E\" build.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: I have MVHR \/ mechanical ventilation. Do I still need trickle vents?\u003c\/h3\u003e\n      \u003cp\u003eExcellent question and the answer is the single best argument for MVHR in noise-heavy properties. If you have a working MVHR system providing the Approved Document F ventilation rate, you do \u003cstrong\u003enot\u003c\/strong\u003e need trickle vents in the window — and removing trickle vents typically \u003cstrong\u003edoubles\u003c\/strong\u003e the real-world acoustic performance of an acoustic unit (a 42 dB Rw window with a trickle vent often performs at 32-34 dB on site). If MVHR isn't in the plan, specify \u003cstrong\u003eacoustic trickle vents\u003c\/strong\u003e (10-15 dB Dn,e,w rating) rather than standard ones, and accept around 3-4 dB on-site loss.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: Can I get acoustic glass in toughened or safety form?\u003c\/h3\u003e\n      \u003cp\u003eYes — acoustic-PVB laminated glass is already safety-rated to BS EN 14449 (the PVB interlayer holds the shards). For ground-floor or door applications you can pair it with a toughened outer pane for the full \u003cstrong\u003eacoustic-laminated + toughened combo\u003c\/strong\u003e: the outer toughened pane meets the BS EN 12150 critical-location requirement, the inner acoustic-PVB laminated pane gives the dB performance and the laminated-glass retention benefit. This is a popular spec for ground-floor city-centre apartments, hotel guest rooms, and street-facing offices.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: Does it work for upstairs noise \/ neighbour music \/ barking dogs?\u003c\/h3\u003e\n      \u003cp\u003eFor airborne noise (music through a shared wall, voices through a party wall): glazing won't help — the noise transmits through the wall, not the window. For airborne noise \u003cstrong\u003ethrough\u003c\/strong\u003e windows (neighbour's stereo with the window open, late-night street talkers, dawn chorus): acoustic glass works very well. For impact noise (footfall above): glazing irrelevant — that's a structural-floor problem. We're happy to triage by phone if you're not sure where the noise is getting in — call the helpline and describe the source.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: How much more expensive is acoustic glass than standard DG?\u003c\/h3\u003e\n      \u003cp\u003eRough order: \u003cstrong\u003e+30% for a 38 dB asymmetric DG\u003c\/strong\u003e (cheapest entry), \u003cstrong\u003e+60% for a 40-42 dB acoustic-PVB DG\u003c\/strong\u003e, \u003cstrong\u003e+120% for a 44 dB+ triple acoustic stack\u003c\/strong\u003e over an equivalent-size standard 4-16-4 unit. The configurator quotes live — you can pick the dB-target and see the price step. For most homeowners on a noise problem the 40-42 dB sweet spot delivers the most subjective improvement per pound spent.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"pr-cag__faq-item\"\u003e\n      \u003ch3\u003eQ: What's the lead time and warranty?\u003c\/h3\u003e\n      \u003cp\u003eAcoustic-PVB laminated DG: \u003cstrong\u003e10-14 working days\u003c\/strong\u003e. Triple acoustic stacks and bespoke: 14-21 working days. Every unit carries a \u003cstrong\u003e10-year edge-seal warranty\u003c\/strong\u003e, \u003cstrong\u003e5-year PVB lamination warranty\u003c\/strong\u003e, and a \u003cstrong\u003eBS EN ISO 10140 lab-measured Rw certificate\u003c\/strong\u003e on request (specify at order). UKCA and BS EN 12758 Declaration of Performance on request.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pr-cag__crosslinks\"\u003e\n    \u003ch2\u003eRelated guides and specifications\u003c\/h2\u003e\n    \u003cdiv class=\"pr-cag__chip-row\"\u003e\n      \u003ca class=\"pr-cag__chip\" href=\"\/collections\/acoustic-double-glazing\"\u003eAcoustic double glazing\u003c\/a\u003e\n      \u003ca class=\"pr-cag__chip\" href=\"\/collections\/acoustic-triple-glazing\"\u003eAcoustic triple glazing\u003c\/a\u003e\n      \u003ca class=\"pr-cag__chip\" href=\"\/collections\/laminated-security-glass\"\u003eLaminated security glass\u003c\/a\u003e\n      \u003ca class=\"pr-cag__chip\" href=\"\/collections\/safety-security-glass\"\u003eSafety glass overview\u003c\/a\u003e\n      \u003ca class=\"pr-cag__chip\" href=\"\/pages\/configure\"\u003eGlass configurator\u003c\/a\u003e\n      \u003ca class=\"pr-cag__chip\" href=\"\/pages\/bulk-orders\"\u003eTrade \u0026amp; bulk orders\u003c\/a\u003e\n      \u003ca class=\"pr-cag__chip\" href=\"\/pages\/contact-us\"\u003eContact us\u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pr-cag__sticky-cta\"\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eDon't guess — match the dB target to the noise source\u003c\/h3\u003e\n      \u003cp\u003eCall \u003ca href=\"tel:01173303057\"\u003e0117 330 3057\u003c\/a\u003e (08:00-18:00 Mon-Fri) with your noise source (road \/ rail \/ aircraft \/ plant) and we'll spec the right build. Or \u003ca href=\"\/pages\/contact-us\"\u003esend a noise survey\u003c\/a\u003e for a planning-condition quote.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003ca class=\"pr-cag__btn\" href=\"\/pages\/configure\"\u003eConfigure acoustic unit\u003c\/a\u003e\n  \u003c\/section\u003e\n\n\u003c\/div\u003e\n","products":[{"product_id":"acoustic-triple-glazed-unit-44db-noise-reduction-16","title":"Acoustic Triple Glazed Unit - 44dB Noise Reduction (Residential Replacement)","description":"\u003ch2\u003eAcoustic Triple Glazed Unit — Residential Noise Reduction\u003c\/h2\u003e\u003cp\u003eLiving near a busy road, railway, or flight path? Our \u003cstrong\u003eAcoustic Triple Glazed Unit\u003c\/strong\u003e cuts external noise by \u003cstrong\u003e44dB\u003c\/strong\u003e — reducing thundering traffic to a gentle background murmur. Designed specifically for \u003cstrong\u003eresidential bedrooms, living rooms, and home offices\u003c\/strong\u003e where noise disrupts sleep, concentration, and quality of life.\u003c\/p\u003e\u003cp\u003eThe difference between standard double glazing (~28dB reduction) and this 44dB acoustic unit is dramatic. Sound reduction is measured logarithmically — every 10dB reduction halves the perceived noise level. At 44dB, you're cutting perceived noise to roughly one-quarter of what you hear through standard windows.\u003c\/p\u003e\u003ch2\u003eHow 44dB Acoustic Glazing Works\u003c\/h2\u003e\u003cp\u003eStandard sealed units use identical glass thicknesses on all panes — which creates resonance at specific frequencies, allowing noise through. Our acoustic units use \u003cstrong\u003easymmetric glass configurations\u003c\/strong\u003e (typically 6mm outer, 4mm middle, 6.4mm acoustic laminated inner) that break up resonance patterns across the full frequency spectrum.\u003c\/p\u003e\u003cp\u003eThe \u003cstrong\u003eacoustic PVB interlayer\u003c\/strong\u003e in the laminated pane is specifically formulated to dampen sound vibration — it's softer and more viscoelastic than standard PVB, absorbing energy rather than transmitting it. Combined with argon gas fill and Low-E coating for thermal performance, this unit doesn't sacrifice energy efficiency for noise reduction.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound reduction:\u003c\/strong\u003e 44dB Rw (weighted)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-value:\u003c\/strong\u003e ~0.8 W\/m²K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcoustic interlayer:\u003c\/strong\u003e Specialist PVB\/EVA laminate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGas fill:\u003c\/strong\u003e Argon (90%+)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-E coating:\u003c\/strong\u003e Yes — thermal and acoustic combined\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eManufactured to \u003cstrong\u003eBS EN 1279\u003c\/strong\u003e at our Bristol facility. \u003cstrong\u003eFENSA registered\u003c\/strong\u003e, \u003cstrong\u003e10-year warranty\u003c\/strong\u003e, nationwide delivery. Acoustic test certificates available on request for planning submissions.\u003c\/p\u003e\u003cp\u003eConfigure your dimensions in our \u003cstrong\u003eglass configurator\u003c\/strong\u003e and select the acoustic upgrade for instant pricing.\u003c\/p\u003e","brand":"Pane Relief","offers":[{"title":"Compact","offer_id":60899497050442,"sku":"TG-COMPACT-MTM","price":200.0,"currency_code":"GBP","in_stock":true},{"title":"Standard","offer_id":60899497083210,"sku":"TG-STANDARD-MTM","price":500.0,"currency_code":"GBP","in_stock":true},{"title":"Large","offer_id":60899497115978,"sku":"TG-LARGE-MTM","price":1200.0,"currency_code":"GBP","in_stock":true},{"title":"Extra Large","offer_id":60899497148746,"sku":"TG-XL-MTM","price":2500.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/3515\/2458\/files\/triple-glazed-insulated-glass-unit-igu-cutaway.webp?v=1773313157"},{"product_id":"36mm-triple-glazed-unit-maximum-performance-9","title":"36mm Triple Glazed Unit - Maximum Performance (Residential Replacement)","description":"\u003ch2\u003e36mm Triple Glazed Unit — Maximum Home Performance\u003c\/h2\u003e\u003cp\u003eFor homeowners who want \u003cstrong\u003ethe very best thermal and acoustic insulation available\u003c\/strong\u003e, our 36mm Triple Glazed Unit delivers a centre-pane U-value of \u003cstrong\u003e0.6 W\/m²K\u003c\/strong\u003e — approaching Passive House territory without the premium price tag. This is our highest-performing standard triple unit, engineered for clients who refuse to compromise on comfort.\u003c\/p\u003e\u003cp\u003eThe difference is tangible. Rooms stay warmer with less heating input. Cold spots near windows disappear. Traffic noise drops to a whisper. If you have ever sat next to a window and felt the chill radiating from the glass, this unit eliminates that entirely.\u003c\/p\u003e\u003ch2\u003ePeak Thermal \u0026amp; Acoustic Performance\u003c\/h2\u003e\u003cp\u003eThe 36mm build-up uses \u003cstrong\u003e4mm-12mm-4mm-12mm-4mm\u003c\/strong\u003e configuration with \u003cstrong\u003edouble soft-coat Low-E coatings\u003c\/strong\u003e and the option of \u003cstrong\u003ekrypton or argon gas fill\u003c\/strong\u003e. The 12mm cavities are at the optimal width for gas-fill thermal performance, delivering the lowest U-value achievable in a standard triple-glazed format.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-value:\u003c\/strong\u003e 0.6 W\/m²K (centre pane)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight transmittance:\u003c\/strong\u003e ~62%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar factor (g-value):\u003c\/strong\u003e 0.38\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound reduction:\u003c\/strong\u003e ~38dB Rw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall thickness:\u003c\/strong\u003e 36mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eManufactured to \u003cstrong\u003eBS EN 1279\u003c\/strong\u003e at our Bristol production facility. \u003cstrong\u003eFENSA registered\u003c\/strong\u003e, \u003cstrong\u003e10-year warranty\u003c\/strong\u003e, nationwide delivery with full transit protection.\u003c\/p\u003e\u003cp\u003eSpecify your exact dimensions and gas fill preference in our \u003cstrong\u003eglass configurator\u003c\/strong\u003e for instant pricing.\u003c\/p\u003e","brand":"Pane Relief","offers":[{"title":"Compact","offer_id":60899521331530,"sku":"TG-COMPACT-MTM","price":200.0,"currency_code":"GBP","in_stock":true},{"title":"Standard","offer_id":60899521364298,"sku":"TG-STANDARD-MTM","price":500.0,"currency_code":"GBP","in_stock":true},{"title":"Large","offer_id":60899521397066,"sku":"TG-LARGE-MTM","price":1200.0,"currency_code":"GBP","in_stock":true},{"title":"Extra Large","offer_id":60899521429834,"sku":"TG-XL-MTM","price":2500.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/3515\/2458\/files\/triple-glazed-insulated-glass-unit-igu-cutaway.webp?v=1773313157"},{"product_id":"specialist-acoustic-laminated-glass-asymmetric-double-glazed-unit","title":"Specialist Acoustic Laminated Double Glazed Unit (8.8 + 4mm Asymmetric)","description":"\n\u003cp class=\"pr-flagship__lede\"\u003e\u003cstrong\u003eThe cost-optimal acoustic flagship — Rw 40 dB in a 28mm double-glazed envelope\u003c\/strong\u003e. An asymmetric double-glazed unit with an 8.8mm acoustic-PVB laminated outer pane and a 4mm clear inner, separated by a 14mm argon-filled cavity, delivers acoustic performance previously only available from triple glazing — at roughly half the cost and weight.\u003c\/p\u003e\n\n\u003cp\u003eFor most urban-noise-mitigation projects, this is the right unit. It fits standard 28mm double-glazed rebates, weighs about 23 kg\/m² (not the 38 kg\/m² of acoustic triple), and achieves an Rw of 40 dB — a 10-12 dB improvement over a typical 1990s 4-12-4 double. The perceived loudness reduction is roughly halving — traffic that previously dominated a room moves into the background.\u003c\/p\u003e\n\n\u003ch2\u003eAsymmetric build — why it works\u003c\/h2\u003e\n\u003cp\u003eSymmetric double-glazed units (4-12-4, 4-20-4) have a coincidence-frequency dip where the two identical panes resonate together. Sound at that frequency punches through. Replacing one pane with a thicker laminated build shifts the coincidence frequency of that pane to a different band — so the two panes' dips no longer coincide.\u003c\/p\u003e\n\n\u003cp\u003eThe acoustic PVB interlayer in the 8.8mm laminate adds viscoelastic damping. Standard PVB (used in safety lamination) helps mildly. Acoustic-grade PVB (e.g., Trosifol SC, Saflex Q) is engineered with specific viscoelastic properties tuned to road and rail frequency bands — it absorbs 3-5 dB more than standard PVB across the critical 500-2500 Hz range.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specification\u003c\/h2\u003e\n\u003ctable class=\"pr-spec-table\"\u003e\n  \u003ctr\u003e\n\u003cth\u003eOverall thickness\u003c\/th\u003e\n\u003ctd\u003e~28mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBuild-up\u003c\/th\u003e\n\u003ctd\u003e8.8mm acoustic-laminated outer (4+4 with 0.76mm acoustic PVB) \/ 14mm argon cavity \/ 4mm clear inner with optional low-E\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eOuter-pane standard\u003c\/th\u003e\n\u003ctd\u003eBS EN 14449 (laminated)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eR\u003csub\u003ew\u003c\/sub\u003e (Weighted Sound Reduction Index)\u003c\/th\u003e\n\u003ctd\u003e40 dB to BS EN ISO 717-1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eR\u003csub\u003ew\u003c\/sub\u003e + C\u003csub\u003etr\u003c\/sub\u003e (road-traffic spectrum)\u003c\/th\u003e\n\u003ctd\u003e36-37 dB (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (centre-pane, with low-E inner face 3)\u003c\/th\u003e\n\u003ctd\u003e1.2 W\/m²K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (without low-E)\u003c\/th\u003e\n\u003ctd\u003e1.5 W\/m²K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eg-value\u003c\/th\u003e\n\u003ctd\u003e0.58\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eLight transmittance\u003c\/th\u003e\n\u003ctd\u003e~78%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e~23 kg\/m² (manageable load in standard frames)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eStandards\u003c\/th\u003e\n\u003ctd\u003eBS EN 1279, BS EN ISO 717-1, BS EN 14449, BS EN 12600 (impact class 2(B)2 via laminated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhere this unit is the right call\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUrban frontage facing busy A-roads, ring roads, or town-centre traffic\u003c\/strong\u003e — typical existing R\u003csub\u003ew\u003c\/sub\u003e 28-30 dB, upgrading to 40 dB roughly halves perceived noise.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProperties within 200m of a railway line\u003c\/strong\u003e — particularly Network Rail main lines, freight routes, and HS2\/Crossrail corridors. Asymmetric stacks handle low-frequency rail noise better than symmetric.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlight-path properties outside the 60 dB L\u003csub\u003eAeq,16h\u003c\/sub\u003e contour\u003c\/strong\u003e where R\u003csub\u003ew\u003c\/sub\u003e 40 typically delivers an acceptable internal noise level without needing the cost\/weight of acoustic triple.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApartment buildings and HMOs\u003c\/strong\u003e where Approved Document E (sound insulation between dwellings) compliance crosses with external glazing performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBoutique hotels and serviced apartments\u003c\/strong\u003e where guest noise expectations drive specification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHome offices and recording studios\u003c\/strong\u003e in urban areas where noise floors below ~35 dB are the target.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe full acoustic-glass guide, including the R\u003csub\u003ew\u003c\/sub\u003e vs R\u003csub\u003ew\u003c\/sub\u003e+C\u003csub\u003etr\u003c\/sub\u003e distinction, frame-seal advice, and acoustic trickle-vent guidance, is on the \u003ca href=\"\/pages\/acoustic-glass\"\u003e\u003cstrong\u003eacoustic glass topical page\u003c\/strong\u003e\u003c\/a\u003e. For the highest-performance acoustic spec (44 dB Rw triple-glazed), see the \u003ca href=\"\/products\/triple-glazed-acoustic-unit-44db-rw\"\u003eTriple Glazed Acoustic flagship\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eStock sizes and pricing\u003c\/h2\u003e\n\u003cp\u003eFive UK-standard stock sizes are below. Dispatch 10-14 working days (acoustic-PVB lamination adds ~5 days to standard DG manufacturing). Custom sizes — including shaped, oversized, and bespoke pane-asymmetry builds (e.g., 8.8 + 6.4 for max-mass at boundaries) — are priced via the \u003ca href=\"\/pages\/configure\"\u003e\u003cstrong\u003econfigurator\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eCertification and standards\u003c\/h2\u003e\n\u003cp\u003eEvery unit ships with: UKCA mark, BS EN 1279 DoP, R\u003csub\u003ew\u003c\/sub\u003e test certificate from a UKAS-accredited acoustic lab (BS EN ISO 10140 methodology), BS EN 14449 laminated-glass certificate on the outer pane, and BS EN 12600 impact classification (Class 2(B)2 via the laminated outer — meets most Approved Document N critical-location requirements as a side benefit). For noise-mitigation grant applications, we supply the R\u003csub\u003ew\u003c\/sub\u003e + C\u003csub\u003etr\u003c\/sub\u003e + C figures as a complete documentation pack.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow much quieter, in practice?\u003c\/h3\u003e\n\u003cp\u003eA 10-12 dB improvement is perceived as roughly halving loudness. If the room currently registers 50 dB(A) of background noise from outside (a typical urban room with 1990s DG facing a busy road), this upgrade typically drops that to 38-40 dB(A) — closer to a quiet residential street. The improvement is most noticeable for speech-intelligibility-band frequencies; low-frequency rumble drops less.\u003c\/p\u003e\n\n\u003ch3\u003eDoes it block low-frequency noise (lorries, basses)?\u003c\/h3\u003e\n\u003cp\u003ePartially. Low frequencies (below 250 Hz) are hard to block with glass mass alone — they're better attenuated with secondary glazing or mass-loaded walls. This unit drops low-frequency noise about 6-8 dB, vs 12-15 dB at mid frequencies. For dominant low-frequency sources (heavy goods routes, freight rail), R\u003csub\u003ew\u003c\/sub\u003e+C\u003csub\u003etr\u003c\/sub\u003e is the more honest figure (36-37 dB vs 40 dB R\u003csub\u003ew\u003c\/sub\u003e).\u003c\/p\u003e\n\n\u003ch3\u003eCan I get this as a triple-glazed unit?\u003c\/h3\u003e\n\u003cp\u003eYes — the \u003ca href=\"\/products\/triple-glazed-acoustic-unit-44db-rw\"\u003eTriple Glazed Acoustic Unit (44 dB Rw)\u003c\/a\u003e adds a third pane for a further 4 dB improvement, at additional cost and weight. For most projects, the double-glazed asymmetric flagship is the cost-optimal sweet spot.\u003c\/p\u003e\n\n\u003ch3\u003eWill my existing frame take this?\u003c\/h3\u003e\n\u003cp\u003eAt 28mm overall, this fits the same rebates as a standard 28mm DG — modern PVCu, aluminium, and timber frames designed for double glazing. The 23 kg\/m² weight is typically inside hinge ratings for windows up to 1500×1200. Confirm sash-balance ratings for very large units.\u003c\/p\u003e\n\n\u003ch3\u003eAcoustic PVB vs standard PVB — is the upgrade worth it?\u003c\/h3\u003e\n\u003cp\u003eYes, for acoustic-priority projects. Acoustic-grade PVB adds 3-5 dB across the 500-2500 Hz speech-intelligibility band over standard PVB at roughly £10-15\/m² premium. For a £200 unit, that's a 5-8% price increase for a 10-15% perceived noise reduction — typically the best £\/dB in the configurator.\u003c\/p\u003e\n\n\u003ch3\u003eSide-benefit: does this also count as safety glass?\u003c\/h3\u003e\n\u003cp\u003eYes. The laminated outer pane satisfies BS EN 12600 Class 2(B)2 — adequate for most critical locations under Approved Document N (door sidelights, low-level windows, bathroom glazing). For Class 1(C)1 (highest impact rating), specify toughened-plus-laminated in the configurator.\u003c\/p\u003e\n\n\u003ch3\u003eWarranty?\u003c\/h3\u003e\n\u003cp\u003e10 years on edge-seal integrity (BS EN 1279-2). 10 years on PVB delamination (BS EN 14449 standard). 10 years on argon retention to ≥80% of initial fill. R\u003csub\u003ew\u003c\/sub\u003e performance is warranted at the certified test value at installation date — frame-seal degradation over time is excluded from the glass warranty.\u003c\/p\u003e\n","brand":"Pane Relief","offers":[{"title":"600 × 400 mm","offer_id":61853203005770,"sku":"DG-AC40-600x400","price":45.0,"currency_code":"GBP","in_stock":true},{"title":"800 × 600 mm","offer_id":61853203038538,"sku":"DG-AC40-800x600","price":61.0,"currency_code":"GBP","in_stock":true},{"title":"1000 × 800 mm","offer_id":61853203071306,"sku":"DG-AC40-1000x800","price":102.0,"currency_code":"GBP","in_stock":true},{"title":"1200 × 1000 mm","offer_id":61853203104074,"sku":"DG-AC40-1200x1000","price":153.0,"currency_code":"GBP","in_stock":true},{"title":"1500 × 1200 mm","offer_id":61853203136842,"sku":"DG-AC40-1500x1200","price":229.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/3515\/2458\/files\/double-glazed-sealed-unit-igu-product-cutaway_779ff7fb-4383-47d1-b092-538c3ce8986a.webp?v=1779007259"},{"product_id":"triple-glazed-acoustic-unit-44db-rw","title":"Triple Glazed Acoustic Unit (44 dB Rw)","description":"\n\u003cp class=\"pr-flagship__lede\"\u003e\u003cstrong\u003eThe hard-spec acoustic flagship — 44 dB Rw under BS EN ISO 717-1\u003c\/strong\u003e. A triple-glazed unit built with asymmetric pane thicknesses, an acoustic-PVB laminated outer, and twin argon-filled cavities tuned to disrupt coincidence-frequency resonance. This is the unit specified by acoustic consultants for properties under flight paths, on A-road frontage, in rail-corridor housing, and against the M25.\u003c\/p\u003e\n\n\u003cp\u003eRw 44 dB is meaningful: the perceived loudness reduction from outside to inside is roughly four times — the difference between a busy A-road at 70 dB(A) sounding like background conversation, and the same road sounding like a quiet office. Combined with a frame and trickle-vent assembly compatible with acoustic performance (sealed perimeter, acoustic vents where required), this unit drives whole-window R\u003csub\u003ew\u003c\/sub\u003e performance into the 40-43 dB range — territory previously only reachable with secondary glazing.\u003c\/p\u003e\n\n\u003ch2\u003eWhy asymmetric panes — the physics\u003c\/h2\u003e\n\u003cp\u003eGlass blocks sound by mass: thicker panes block more. But every pane has a \"coincidence frequency\" — a frequency at which the acoustic wave matches a resonant flexural mode of the pane, and the pane suddenly stops blocking sound. For 4mm float, coincidence is around 3000 Hz; for 6mm it shifts to ~2000 Hz; for laminated 8.8mm it spreads across a wider band but with lower peak dip thanks to the PVB damping.\u003c\/p\u003e\n\n\u003cp\u003eAn asymmetric stack — 8.8mm acoustic-laminated outer \/ 4mm middle \/ 4mm inner — places coincidence dips at different frequencies in each pane, so a single frequency can't punch through the assembly. The acoustic PVB interlayer adds viscoelastic damping that further suppresses the laminated pane's dip. Together, these mechanisms drive R\u003csub\u003ew\u003c\/sub\u003e 5-7 dB above what a symmetric triple at the same total mass would deliver.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specification\u003c\/h2\u003e\n\u003ctable class=\"pr-spec-table\"\u003e\n  \u003ctr\u003e\n\u003cth\u003eOverall thickness\u003c\/th\u003e\n\u003ctd\u003e~42-44mm (asymmetric build)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBuild-up\u003c\/th\u003e\n\u003ctd\u003e8.8mm acoustic-PVB laminated outer (4+4 with 0.76mm acoustic interlayer) \/ 12mm argon \/ 4mm clear \/ 12mm argon \/ 4mm clear\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eCavities\u003c\/th\u003e\n\u003ctd\u003e2 × 12mm argon-filled (BS EN 1279-3)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eR\u003csub\u003ew\u003c\/sub\u003e (Weighted Sound Reduction Index)\u003c\/th\u003e\n\u003ctd\u003e44 dB to BS EN ISO 717-1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eR\u003csub\u003ew\u003c\/sub\u003e + C\u003csub\u003etr\u003c\/sub\u003e (road traffic spectrum)\u003c\/th\u003e\n\u003ctd\u003e40-41 dB (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (centre-pane, with low-E)\u003c\/th\u003e\n\u003ctd\u003e0.8 W\/m²K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eg-value\u003c\/th\u003e\n\u003ctd\u003e0.52\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eLight transmittance\u003c\/th\u003e\n\u003ctd\u003e~70%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e~38 kg\/m² — confirm frame load capacity\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eStandards\u003c\/th\u003e\n\u003ctd\u003eBS EN 1279, BS EN ISO 717-1 (acoustic), BS EN 14449 (laminated), BS EN 12600 (impact via laminated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhere this unit is the right call\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeathrow, Gatwick, Manchester, Stansted, Birmingham flight-path frontage\u003c\/strong\u003e — particularly for properties inside the 57 dB L\u003csub\u003eAeq,16h\u003c\/sub\u003e noise contour where local-authority noise insulation grants may apply.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eA-road and motorway-adjacent housing\u003c\/strong\u003e — particularly retrofit projects where existing single or first-generation double glazing is delivering only R\u003csub\u003ew\u003c\/sub\u003e 25-28 dB.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRail-corridor properties\u003c\/strong\u003e — main-line Network Rail routes, HS1, HS2, Crossrail. Train noise has a strong low-frequency component that asymmetric stacks handle better than symmetric.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHotels, hospitals, schools, and residential care in urban centres\u003c\/strong\u003e — where building-regs Approved Document E (sound insulation) requires verified performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRecording studios, home cinemas, and high-spec residential\u003c\/strong\u003e — where guaranteed noise floors drive acoustic specifications regardless of external noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe full acoustic-glazing decision tree — laminated vs asymmetric vs triple, Rw vs Rw+Ctr, and how the dB(A) reduction translates to perceived loudness — is on the \u003ca href=\"\/pages\/acoustic-glass\"\u003e\u003cstrong\u003eacoustic glass topical page\u003c\/strong\u003e\u003c\/a\u003e, with installation and frame-seal advice. For a simpler double-glazed acoustic option, see the \u003ca href=\"\/products\/specialist-acoustic-laminated-glass-asymmetric-double-glazed-unit\"\u003eSpecialist Acoustic Laminated double-glazed flagship\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eStock sizes and pricing\u003c\/h2\u003e\n\u003cp\u003eFive UK-standard stock sizes are below. Dispatch 14-18 working days (acoustic-PVB lamination + triple-glazed assembly is a longer process than standard triple). Custom sizes — including bespoke acoustic stacks tuned to a specific noise spectrum (e.g., low-frequency dominant rail noise) — are priced via the \u003ca href=\"\/pages\/configure\"\u003e\u003cstrong\u003econfigurator\u003c\/strong\u003e\u003c\/a\u003e with an option for a free acoustic-consultant phone consultation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFrame load note:\u003c\/strong\u003e at ~38 kg\/m² this is one of the heaviest mainstream IGUs available. A 1500 × 1200 unit is ~68 kg. Specify reinforced hinges and check sash-balance ratings. Aluminium and laminated-timber frames are the appropriate choices; older PVCu frames typically cannot accept this load.\u003c\/p\u003e\n\n\u003ch2\u003eCertification and standards\u003c\/h2\u003e\n\u003cp\u003eEvery unit ships with: UKCA mark, BS EN 1279 DoP, R\u003csub\u003ew\u003c\/sub\u003e test certificate from a UKAS-accredited acoustic laboratory (BS EN ISO 10140 test methodology), laminated-glass BS EN 14449 certification, and CWCT (Centre for Window \u0026amp; Cladding Technology) test pack on request. For local-authority noise-grant applications, we can supply the R\u003csub\u003ew\u003c\/sub\u003e + C\u003csub\u003etr\u003c\/sub\u003e + C figures as a pack.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does R\u003csub\u003ew\u003c\/sub\u003e 44 dB actually sound like vs my current windows?\u003c\/h3\u003e\n\u003cp\u003eA typical 1990s 4-12-4 double-glazed unit achieves R\u003csub\u003ew\u003c\/sub\u003e 28-30 dB. Upgrading to R\u003csub\u003ew\u003c\/sub\u003e 44 dB is a 14-16 dB improvement — perceived as roughly a 75% loudness reduction. Heavy traffic that previously dominated the room drops to the level of background conversation. Note: this assumes a fully-sealed frame and acoustic-compatible trickle vents; air leakage paths around the unit can lose 8-10 dB.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the difference between R\u003csub\u003ew\u003c\/sub\u003e, R\u003csub\u003ew\u003c\/sub\u003e+C\u003csub\u003etr\u003c\/sub\u003e, and dB(A)?\u003c\/h3\u003e\n\u003cp\u003eR\u003csub\u003ew\u003c\/sub\u003e is a single-number weighted index across 100-3150 Hz (BS EN ISO 717-1). C\u003csub\u003etr\u003c\/sub\u003e is a correction factor weighted toward road-traffic frequencies (low-frequency-heavy). R\u003csub\u003ew\u003c\/sub\u003e+C\u003csub\u003etr\u003c\/sub\u003e is the more honest figure for road-noise scenarios. dB(A) is an A-weighted decibel level, used for measuring actual noise — not for rating glass.\u003c\/p\u003e\n\n\u003ch3\u003eIs triple acoustic actually better than the best double acoustic?\u003c\/h3\u003e\n\u003cp\u003eMarginally — typically 2-4 dB at the high end. The R\u003csub\u003ew\u003c\/sub\u003e improvement from double-to-triple is smaller than asymmetric-pane mass gains within a double. The case for triple acoustic is when you want both Rw 42+ AND U-value 0.8 — i.e., thermal and acoustic in one stack. For acoustic-only priorities, a double-glazed acoustic-laminated at lower cost is often the better choice.\u003c\/p\u003e\n\n\u003ch3\u003eWill this fit my existing frame?\u003c\/h3\u003e\n\u003cp\u003eAt 42-44mm overall, only thermally-broken aluminium and timber-aluminium composite frames with 70-90mm depth will accept it. Standard PVCu and older aluminium will need full frame replacement, not just reglazing. We strongly recommend an installer site visit before specifying — frame compatibility is the most common project blocker for acoustic triple.\u003c\/p\u003e\n\n\u003ch3\u003eDo I need acoustic trickle vents?\u003c\/h3\u003e\n\u003cp\u003eYes — Building Regs Approved Document F requires background ventilation, but standard trickle vents short-circuit the acoustic performance. Specify acoustic trickle vents (Rytons Aircore, Greenwood Acoustic, or equivalent) — typically R\u003csub\u003ew\u003c\/sub\u003e(C;C\u003csub\u003etr\u003c\/sub\u003e) ≥ 38 dB so they're not the weak link. Vent acoustic ratings are independent of glass acoustic ratings.\u003c\/p\u003e\n\n\u003ch3\u003eLocal-authority noise-grant compliance?\u003c\/h3\u003e\n\u003cp\u003eMost UK noise-mitigation grant schemes (around airports + major motorways) accept R\u003csub\u003ew\u003c\/sub\u003e ≥ 35 dB as the minimum specified glazing. R\u003csub\u003ew\u003c\/sub\u003e 44 dB exceeds this comfortably and qualifies for top-tier funding bands where applicable. We supply the test pack at no charge for grant applications.\u003c\/p\u003e\n\n\u003ch3\u003eWarranty?\u003c\/h3\u003e\n\u003cp\u003e10 years on edge-seal integrity (BS EN 1279-2). 10 years on acoustic-PVB delamination (manufacturer's BS EN 14449 standard warranty). 10 years on argon retention to ≥80% of initial fill. Acoustic R\u003csub\u003ew\u003c\/sub\u003e performance is warranted at the certified test value at installation date — declining performance is not warrantable because it's typically a frame-seal or vent issue, not a glass issue.\u003c\/p\u003e\n","brand":"Pane Relief","offers":[{"title":"600 × 400 mm","offer_id":61853203202378,"sku":"TG-AC44-600x400","price":45.0,"currency_code":"GBP","in_stock":true},{"title":"800 × 600 mm","offer_id":61853203235146,"sku":"TG-AC44-800x600","price":80.0,"currency_code":"GBP","in_stock":true},{"title":"1000 × 800 mm","offer_id":61853203267914,"sku":"TG-AC44-1000x800","price":133.0,"currency_code":"GBP","in_stock":true},{"title":"1200 × 1000 mm","offer_id":61853203300682,"sku":"TG-AC44-1200x1000","price":199.0,"currency_code":"GBP","in_stock":true},{"title":"1500 × 1200 mm","offer_id":61853203333450,"sku":"TG-AC44-1500x1200","price":299.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/3515\/2458\/files\/triple-glazed-insulated-glass-unit-igu-cutaway_104e02f2-d2b6-4852-a4c8-e6b512bd20f3.webp?v=1779007261"}],"url":"https:\/\/panerelief.co.uk\/collections\/acoustic-glass.oembed","provider":"Pane Relief","version":"1.0","type":"link"}