{"product_id":"32mm-triple-glazed-mid-thickness-retrofit-unit","title":"32mm Triple Glazed Unit (Mid-Thickness Retrofit)","description":"\n\u003cp class=\"pr-flagship__lede\"\u003e\u003cstrong\u003eThe 2010-2020 frame sweet spot\u003c\/strong\u003e. A 32mm triple-glazed sealed unit (4mm clear \/ 10mm argon \/ 4mm clear with planitherm soft-coat \/ 10mm argon \/ 4mm clear) hits the middle of the cavity-depth tradeoff: enough cavity volume for ~0.9 W\/m²K centre-pane U-value, thin enough to drop into the 32mm rebate that dominated UK PVCu replacement frames in the 2010-2020 decade.\u003c\/p\u003e\n\n\u003cp\u003e32mm rebates became the unofficial UK standard around 2010 when frame manufacturers started shipping rebates sized for \"future-proof double or current-spec triple\". By 2015, most PVCu replacement frames left the factory with 32mm sash rebates. That means there are roughly 6-8 million UK homes whose current frame can accept a 32mm triple unit without rebate-routing or full frame replacement. This flagship is built for that retrofit market.\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\u003e32mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBuild-up\u003c\/th\u003e\n\u003ctd\u003e4mm clear \/ 10mm argon \/ 4mm clear with Planitherm Total+ soft-coat (face 3) \/ 10mm argon \/ 4mm clear with Planitherm Total+ soft-coat (face 5)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eGas fill\u003c\/th\u003e\n\u003ctd\u003e90% argon, both cavities (BS EN 1279-3)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSpacer bar\u003c\/th\u003e\n\u003ctd\u003eWarm-edge composite, black — twin spacers\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (centre-pane)\u003c\/th\u003e\n\u003ctd\u003e0.9 W\/m²K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (whole window, PVCu frame)\u003c\/th\u003e\n\u003ctd\u003e~1.2 W\/m²K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eg-value\u003c\/th\u003e\n\u003ctd\u003e0.50\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\u003eBFRC Window Energy Rating\u003c\/th\u003e\n\u003ctd\u003eA or A+ (in compliant frame)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSound reduction (Rw)\u003c\/th\u003e\n\u003ctd\u003e~34 dB\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, BS EN 12758\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\u003e2010-2020 PVCu replacement frames with 32mm-rebated sashes\u003c\/strong\u003e — the dominant decade for UK replacement glazing. Most homes with frames replaced in this window have rebates ready for 32mm triple.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMid-spec new-build extensions and loft conversions\u003c\/strong\u003e where the frame brief specified \"32mm rebate, triple-capable\" — common with Veka, Liniar, Eurocell, and Rehau profiles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eA+ WER target without paying 36-44mm prices\u003c\/strong\u003e — the 32mm build crosses the A\/A+ threshold on most frame profiles, giving a meaningful EPC uplift over A-rated double glazing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApproved Document L1A new-build compliance\u003c\/strong\u003e — Part L1A's tighter U-value targets are met cleanly with 32mm triple (1.2 W\/m²K whole-window beats the 1.4 target with headroom).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMEES C-rating compliance for landlords pre-2028\u003c\/strong\u003e — upgrading to 32mm triple typically lifts an EPC by 8-12 points depending on baseline.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor 28mm-rebated frames (typically 2002-2010 vintage), the \u003ca href=\"\/products\/28mm-triple-glazed-slim-rebate-retrofit-unit\"\u003e\u003cstrong\u003e28mm Triple Glazed Slim Rebate Retrofit\u003c\/strong\u003e\u003c\/a\u003e is the right call. For 36mm-rebated new builds, the \u003ca href=\"\/products\/36mm-standard-triple-glazed-unit\"\u003e\u003cstrong\u003e36mm Standard Triple Glazed Unit\u003c\/strong\u003e\u003c\/a\u003e gives more cavity volume for marginally better thermals. The \u003ca href=\"\/pages\/triple-glazing\"\u003e\u003cstrong\u003etriple-glazing topical page\u003c\/strong\u003e\u003c\/a\u003e walks the cavity-depth math in detail.\u003c\/p\u003e\n\n\u003ch2\u003eStock sizes and pricing\u003c\/h2\u003e\n\u003cp\u003eFive UK-standard stock sizes are listed below. Each is dispatched 10-14 working days from order. Custom rectangular and shaped variants are priced via the \u003ca href=\"\/pages\/configure\"\u003e\u003cstrong\u003eonline glass configurator\u003c\/strong\u003e\u003c\/a\u003e. Trade accounts: log in for tiered volume pricing.\u003c\/p\u003e\n\n\u003ch2\u003eCertification and standards\u003c\/h2\u003e\n\u003cp\u003eUKCA mark, BS EN 1279 Declaration of Performance with dual-cavity argon-fill certificate (both cavities tested per BS EN 1279-3), dual-surface low-E coating identification (faces 3 and 5), and Letter of Conformance for BS EN 673 \/ BS EN 410 \/ BS EN 12758. For Building Regs Part L1A or L1B sign-off, the supplied centre-pane U-value certificate plus the frame's whole-window calculation is sufficient evidence.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I confirm my frame is 32mm-rebated?\u003c\/h3\u003e\n\u003cp\u003eCarefully remove the inner glazing bead from one casement. Measure the rebate depth (the slot the unit sits in) with calipers. 32mm rebate accepts a 32mm unit with the standard 3mm clearance \/ sealant margin. If the rebate measures 28mm, see the 28mm slim-rebate flagship. If 36mm or more, see the 36mm standard or 44mm premium triple flagships.\u003c\/p\u003e\n\n\u003ch3\u003e32mm vs 36mm — is the difference worth the price step?\u003c\/h3\u003e\n\u003cp\u003eU-value: 32mm triple = 0.9 W\/m²K vs 36mm triple = 0.7 W\/m²K. The 36mm unit delivers ~20% better thermals because the wider cavities allow more convection-resistant gas volume. For most retrofits the 32mm is the right call (no frame swap needed). For new builds where the rebate is chosen at frame-spec time, 36mm is the better long-term spec.\u003c\/p\u003e\n\n\u003ch3\u003eWill the heavier weight stress my frame hinges?\u003c\/h3\u003e\n\u003cp\u003eTriple glazing weighs ~30 kg\/m² vs double's ~20 kg\/m². A typical 1200×1000 casement carries ~36 kg of triple vs ~24 kg of double. Most 2010+ UK casement hinges are rated for 30+ kg per leaf with a single pair, 50+ kg with twin pairs. Older or budget hinges may need upgrading — check manufacturer data before ordering oversize units.\u003c\/p\u003e\n\n\u003ch3\u003eSun-facing rooms — will I lose solar gain?\u003c\/h3\u003e\n\u003cp\u003eA small amount, yes. The 32mm triple's g-value is ~0.50 vs a 28mm Low-E double's ~0.62. In south-facing rooms that means modestly less free winter solar gain. For climates where solar overheating is the bigger summer issue, that's actually a benefit. For passive-house design where winter solar gain is engineered into the heating strategy, this needs balancing against the thermal-envelope improvement.\u003c\/p\u003e\n\n\u003ch3\u003eAcoustic uplift over double?\u003c\/h3\u003e\n\u003cp\u003eRw ~34 dB for the 32mm triple vs ~30 dB for a 28mm Low-E double — a 4 dB improvement, perceptible but not transformative. The twin cavity helps low-frequency noise. For serious acoustic problems (railway lines, A-roads, flight paths) see the \u003ca href=\"\/products\/triple-glazed-acoustic-unit-44db-rw\"\u003eTriple Glazed Acoustic Unit (44 dB Rw)\u003c\/a\u003e with PVB interlayer.\u003c\/p\u003e\n\n\u003ch3\u003eLead time and warranty?\u003c\/h3\u003e\n\u003cp\u003e10-14 working days dispatch. 10-year warranty on edge-seal integrity, dual-cavity argon retention, and low-E coating performance. Transit damage covered 14 days from delivery — inspect on receipt before installer signs off.\u003c\/p\u003e\n","brand":"Pane Relief","offers":[{"title":"600 × 400 mm","offer_id":61855200706890,"sku":"TG32-MIDRB-600x400","price":45.0,"currency_code":"GBP","in_stock":true},{"title":"800 × 600 mm","offer_id":61855200739658,"sku":"TG32-MIDRB-800x600","price":88.0,"currency_code":"GBP","in_stock":true},{"title":"1000 × 800 mm","offer_id":61855200772426,"sku":"TG32-MIDRB-1000x800","price":147.0,"currency_code":"GBP","in_stock":true},{"title":"1200 × 1000 mm","offer_id":61855200805194,"sku":"TG32-MIDRB-1200x1000","price":220.0,"currency_code":"GBP","in_stock":true},{"title":"1500 × 1200 mm","offer_id":61855200837962,"sku":"TG32-MIDRB-1500x1200","price":330.0,"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_577202a5-a3fe-4659-9e45-6af9d228ea35.webp?v=1779039914","url":"https:\/\/panerelief.co.uk\/products\/32mm-triple-glazed-mid-thickness-retrofit-unit","provider":"Pane Relief","version":"1.0","type":"link"}