{"product_id":"36mm-standard-triple-glazed-unit","title":"36mm Standard Triple Glazed Unit (Argon)","description":"\n\u003cp class=\"pr-flagship__lede\"\u003e\u003cstrong\u003eTwo sealed cavities, three panes, U-value 0.8 W\/m²K\u003c\/strong\u003e. A 36mm triple-glazed unit (4mm \/ 12mm argon \/ 4mm \/ 12mm argon \/ 4mm) is the Scandinavian default — the spec that goes into Norwegian, Finnish, and German new-build as the entry-level energy spec. In the UK, it's the upgrade path from A-rated double when winter heat loss matters more than installed cost.\u003c\/p\u003e\n\n\u003cp\u003eTriple glazing's value isn't just lower U — it's a warmer inner-pane surface temperature. With external air at -2°C and interior at 21°C, a double-glazed unit's interior pane sits around 11°C (touch-cold). A triple-glazed unit's interior pane sits around 17°C — close enough to room temperature that radiant chill against the body, and condensation on cold glass, both effectively disappear.\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\u003e36mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBuild-up\u003c\/th\u003e\n\u003ctd\u003e4mm clear \/ 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\u003eSpacer bars\u003c\/th\u003e\n\u003ctd\u003e2 × warm-edge composite\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (centre-pane)\u003c\/th\u003e\n\u003ctd\u003e0.8 W\/m²K (with low-E on inner face)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (uncoated)\u003c\/th\u003e\n\u003ctd\u003e1.0 W\/m²K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eg-value\u003c\/th\u003e\n\u003ctd\u003e0.55\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eLight transmittance\u003c\/th\u003e\n\u003ctd\u003e~71%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e~30 kg\/m² (vs ~20 kg\/m² for 24mm DG — 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 673, BS EN 410, Passivhaus-compatible per PHI thermal requirements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhere triple glazing is the right call\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCold-climate orientation\u003c\/strong\u003e — north-facing bedrooms, exposed elevations, top-floor rooms under uninsulated lofts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePassivhaus and EnerPHit retrofits\u003c\/strong\u003e — Passivhaus Institut requires whole-window U ≤ 0.8 W\/m²K. A 36mm triple unit in a thermally-broken aluminium or timber frame is the standard route.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAcoustic-plus-thermal stacks\u003c\/strong\u003e — combine triple panes with asymmetric thicknesses (4-12-6-12-4 or laminated outer) for Rw 38-44 dB while maintaining 0.8 U-value. See the \u003ca href=\"\/products\/acoustic-triple-glazed-unit-44db-noise-reduction-16\"\u003eacoustic triple variant\u003c\/a\u003e for the 44dB spec.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeat-pump and MVHR retrofits\u003c\/strong\u003e — air-source heat pumps work most efficiently at low flow temperatures (35-45°C). Triple glazing's lower fabric heat loss lets the heat pump hold setpoint without bumping flow temp.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe full thermal-vs-cost analysis is on the \u003ca href=\"\/pages\/triple-glazing\"\u003e\u003cstrong\u003etriple glazing topical page\u003c\/strong\u003e\u003c\/a\u003e — including the payback-period math, frame-load implications, and when triple genuinely outperforms A-rated double.\u003c\/p\u003e\n\n\u003ch2\u003eStock sizes and pricing\u003c\/h2\u003e\n\u003cp\u003eFive UK-standard stock sizes below. Dispatch 5-7 working days. Custom sizes including shaped, oversized (\u0026gt;1500mm any dimension), and laminated variants are priced via the \u003ca href=\"\/pages\/configure\"\u003e\u003cstrong\u003econfigurator\u003c\/strong\u003e\u003c\/a\u003e. Trade accounts see tiered pricing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFrame load note:\u003c\/strong\u003e triple-glazed units are ~50% heavier than double-glazed equivalents. Confirm hinge capacity, sash weight rating, and reinforcement spec on your frames before ordering. Most modern PVCu profiles are rated for triple — older or budget profiles may need steel reinforcement.\u003c\/p\u003e\n\n\u003ch2\u003eCertification and standards\u003c\/h2\u003e\n\u003cp\u003eUKCA-marked, BS EN 1279 compliant across all six parts. PHI-certified manufacturers carry an additional Passivhaus-component certification — request this stamp at order if specifying for a Passivhaus project.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eIs triple glazing worth the cost in the UK?\u003c\/h3\u003e\n\u003cp\u003eFor new-build and major retrofit: yes, especially with heat pumps where lower fabric loss directly improves COP. For straight replacement on a Victorian terrace: the payback period is long (15-25 years) and A-rated double often delivers 80% of the benefit at 60% of the cost. Use the configurator's energy-saving estimator for your specific situation.\u003c\/p\u003e\n\n\u003ch3\u003eWill my existing frame take a 36mm unit?\u003c\/h3\u003e\n\u003cp\u003eMost modern PVCu and aluminium frames are designed for 28mm units. Some 70mm-depth systems accept 36mm with no modification; others need a deeper bead or full reglaze-bead replacement. Send a frame profile photo via \u003ca href=\"\/pages\/contact-us\"\u003eour contact form\u003c\/a\u003e for a compatibility check.\u003c\/p\u003e\n\n\u003ch3\u003eWhy is g-value lower than double glazing?\u003c\/h3\u003e\n\u003cp\u003eEach pane reflects and absorbs some solar radiation. Three panes reflect\/absorb more than two. The triple-glazed g-value of ~0.55 vs the A-rated double's ~0.62 means slightly less passive solar heat gain in winter — for south-facing principal rooms in a UK climate, this is genuinely a small downside.\u003c\/p\u003e\n\n\u003ch3\u003eArgon vs krypton vs xenon?\u003c\/h3\u003e\n\u003cp\u003eFor 12mm cavities (this unit), argon is optimal — krypton's benefit appears only in cavities ≤ 8mm. For slim-cavity triple (10-10mm), krypton is worth the premium. Xenon is rarely cost-justified outside specialist Passivhaus components.\u003c\/p\u003e\n\n\u003ch3\u003eNoise reduction vs double?\u003c\/h3\u003e\n\u003cp\u003eMarginal — Rw of ~33 dB vs A-rated double's ~31 dB. If acoustic is the priority, asymmetric pane thicknesses or laminated panes deliver much more than adding a third pane. See the dedicated acoustic flagships.\u003c\/p\u003e\n\n\u003ch3\u003eCondensation on the outside?\u003c\/h3\u003e\n\u003cp\u003eYes, occasionally — and counterintuitively, it's a sign the glass is performing well. With triple glazing, the outer-pane surface stays close to outdoor dew point on clear cold nights (because almost no heat is leaking out to warm it). Outside-face dew is a feature, not a defect.\u003c\/p\u003e\n","brand":"Pane Relief","offers":[{"title":"600 × 400 mm","offer_id":61851583054154,"sku":"TG36-STD-600x400","price":45.0,"currency_code":"GBP","in_stock":true},{"title":"800 × 600 mm","offer_id":61851583086922,"sku":"TG36-STD-800x600","price":71.0,"currency_code":"GBP","in_stock":true},{"title":"1000 × 800 mm","offer_id":61851583119690,"sku":"TG36-STD-1000x800","price":118.0,"currency_code":"GBP","in_stock":true},{"title":"1200 × 1000 mm","offer_id":61851583152458,"sku":"TG36-STD-1200x1000","price":176.0,"currency_code":"GBP","in_stock":true},{"title":"1500 × 1200 mm","offer_id":61851583185226,"sku":"TG36-STD-1500x1200","price":264.0,"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_758c92a7-342a-41e9-9e33-653ba1e180ac.webp?v=1778952476","url":"https:\/\/panerelief.co.uk\/products\/36mm-standard-triple-glazed-unit","provider":"Pane Relief","version":"1.0","type":"link"}