{"product_id":"24mm-clear-double-glazed-unit","title":"24mm Clear Double Glazed Unit (Standard Argon)","description":"\n\u003cp class=\"pr-flagship__lede\"\u003e\u003cstrong\u003eThe default replacement sealed unit for UK homes\u003c\/strong\u003e. A 24mm clear double-glazed unit (4mm clear \/ 16mm argon-filled cavity \/ 4mm clear) is the workhorse of British replacement glazing — fitted to the majority of post-2002 PVCu, aluminium, and timber frames, and the unit most failed (misted, blown, condensation-streaked) units in pre-2015 stock are being replaced with.\u003c\/p\u003e\n\n\u003cp\u003eThis flagship is built on Pilkington-grade 4mm float glass, a 16mm warm-edge spacer, and a 90% argon fill (factory-tested at 92-95% on initial fill, with 1% per annum loss assumed under BS EN 1279-2). Krypton fill is available as a custom-configure option for slim-cavity variants — for 24mm symmetric units, argon delivers the better cost-per-watt envelope.\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\u003e24mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBuild-up\u003c\/th\u003e\n\u003ctd\u003e4mm clear float \/ 16mm cavity \/ 4mm clear float\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eGas fill\u003c\/th\u003e\n\u003ctd\u003e90% argon (BS EN 1279-3 compliant)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSpacer bar\u003c\/th\u003e\n\u003ctd\u003eWarm-edge composite (Edgetech Super Spacer or equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eU-value (centre-pane)\u003c\/th\u003e\n\u003ctd\u003e1.4 W\/m²K\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eg-value (solar transmittance)\u003c\/th\u003e\n\u003ctd\u003e0.72\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eLight transmittance (LT)\u003c\/th\u003e\n\u003ctd\u003e~80%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eStandards\u003c\/th\u003e\n\u003ctd\u003eBS EN 1279 (parts 1, 2, 3, 5, 6)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eManufactured\u003c\/th\u003e\n\u003ctd\u003eUK, FENSA-registered supply chain\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\u003eLike-for-like replacement\u003c\/strong\u003e of a failed (misted\/blown) post-2002 unit where the frame is sound and the existing rebate accepts a 24mm unit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal partitions, porches, and unheated outbuildings\u003c\/strong\u003e where U-value isn't critical and 80% light transmittance matters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eListed-building consents that permit DG\u003c\/strong\u003e where the unit must read as a clear single-pane sightline (24mm clear hides cavity from most viewing angles better than tinted\/coated alternatives).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBay windows, dormer cheeks, and small-aperture casements\u003c\/strong\u003e where the 600 × 400 stock size lands without trimming.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor applications where U-value is the priority (Building Regs Approved Document L compliance, new-build, A-rated specification), the \u003ca href=\"\/products\/28mm-low-e-a-rated-double-glazed-unit\"\u003e\u003cstrong\u003e28mm Low-E A-Rated\u003c\/strong\u003e\u003c\/a\u003e variant is the recommended upgrade — same form factor, U-value 1.1 W\/m²K, planitherm soft-coat.\u003c\/p\u003e\n\n\u003cp\u003eFor acoustic applications (railway lines, flight paths, A-roads), the \u003ca href=\"\/pages\/acoustic-glass\"\u003e\u003cstrong\u003eacoustic glass topical page\u003c\/strong\u003e\u003c\/a\u003e walks the Rw \/ dB-reduction math and links to the laminated alternatives.\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 5-7 working days from order via our FENSA-registered manufacturing partners. Custom sizes — including shaped, tinted, low-E, toughened, and acoustic variants — are priced via the \u003ca href=\"\/pages\/configure\"\u003e\u003cstrong\u003eonline glass configurator\u003c\/strong\u003e\u003c\/a\u003e with the same per-m² rate as the stock units (no custom-size premium).\u003c\/p\u003e\n\n\u003cp\u003eTrade accounts: log in to your account to see your tiered pricing — volume discount applies at 5+ units per order.\u003c\/p\u003e\n\n\u003ch2\u003eCertification and standards\u003c\/h2\u003e\n\u003cp\u003eEvery unit ships with a CE\/UKCA mark referencing BS EN 1279, a unique IGU stamp inside the cavity (visible at edge), and a Declaration of Performance available on request. Argon fill is tested per BS EN 1279-3 (initial fill ≥85%, annual loss \u0026lt;1% under EN-1279-2 accelerated weathering).\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWill this fit my existing frame?\u003c\/h3\u003e\n\u003cp\u003eCheck the rebate depth (the slot the glass sits in). A 24mm unit needs a rebate depth of at least 24mm + 3mm clearance = 27mm. Most post-2002 PVCu and aluminium frames accept this. Pre-2000 timber casements often had 20mm rebates designed for single glazing — those may need re-rebating or stepping to a slim 14mm Krypton unit.\u003c\/p\u003e\n\n\u003ch3\u003eHow long does a sealed unit last?\u003c\/h3\u003e\n\u003cp\u003eUK industry average is 15-25 years before edge-seal failure causes misting. Our units carry a 10-year manufacturer's warranty on seal integrity (BS EN 1279-2 accelerated-weathering tested). Argon retention is warranted to 80% of initial fill at 10 years.\u003c\/p\u003e\n\n\u003ch3\u003eArgon vs no-gas: does it matter?\u003c\/h3\u003e\n\u003cp\u003eYes. A 24mm air-filled unit has a centre-pane U-value of ~1.8 W\/m²K. The argon fill drops that to 1.4 — about a 22% improvement in winter heat retention. The £\/W improvement of argon is one of the best in residential glazing.\u003c\/p\u003e\n\n\u003ch3\u003eCan I get this with a low-E coating?\u003c\/h3\u003e\n\u003cp\u003eYes — use the configurator to add a Pilkington K or Optitherm soft-coat. The price uplift is computed live. Alternatively, the dedicated \u003ca href=\"\/products\/28mm-low-e-a-rated-double-glazed-unit\"\u003e28mm Low-E A-Rated flagship\u003c\/a\u003e is a single-button purchase.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the lead time for shaped or custom sizes?\u003c\/h3\u003e\n\u003cp\u003eStock sizes: 5-7 working days. Custom rectangular (non-stock): 7-10 working days. Shaped (arched, raked, circular): 10-14 working days. Tempered\/toughened: add 3 working days. All times exclude national-holiday weeks.\u003c\/p\u003e\n\n\u003ch3\u003eDo you fit, or supply only?\u003c\/h3\u003e\n\u003cp\u003eWe supply only — but we can recommend FENSA-registered fitters in your postcode area. Contact the helpline (08:00-18:00 Mon-Fri) for fitter introductions. Supply + fit packages route via partner installers; \u003ca href=\"\/pages\/contact-us\"\u003econtact us\u003c\/a\u003e for a quote.\u003c\/p\u003e\n","brand":"Pane Relief","offers":[{"title":"600 × 400 mm","offer_id":61851582431562,"sku":"DG24-CLR-600x400","price":45.0,"currency_code":"GBP","in_stock":true},{"title":"800 × 600 mm","offer_id":61851582464330,"sku":"DG24-CLR-800x600","price":47.0,"currency_code":"GBP","in_stock":true},{"title":"1000 × 800 mm","offer_id":61851582497098,"sku":"DG24-CLR-1000x800","price":79.0,"currency_code":"GBP","in_stock":true},{"title":"1200 × 1000 mm","offer_id":61851582529866,"sku":"DG24-CLR-1200x1000","price":118.0,"currency_code":"GBP","in_stock":true},{"title":"1500 × 1200 mm","offer_id":61851582562634,"sku":"DG24-CLR-1500x1200","price":176.0,"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_54370c02-2440-4a9f-8880-a7b3c20db6b3.webp?v=1778952471","url":"https:\/\/panerelief.co.uk\/products\/24mm-clear-double-glazed-unit","provider":"Pane Relief","version":"1.0","type":"link"}