{"product_id":"aluminium-coping-t-junction","title":"3mm Aluminium Flat Coping – 90° T-Junction | 75mm External Leg","description":"\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOn wider parapet walls, typically from 510mm upward, the coping system needs a heavier gauge to maintain rigidity across the span. At a T-shaped wall intersection where three coping runs meet, the junction piece carries the greatest load and spans the widest area. A 2mm T-junction may flex on a wide commercial parapet. The 3mm version provides the additional rigidity needed to keep the coping flat, stable and windproof at the most complex point in the system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThis 3mm aluminium flat coping T-junction connects three coping runs at a 90 degree T-shaped intersection, maintaining a weathertight seal across all three directions. It is powder coated in the same RAL colour as the coping lengths, uses the same concealed fix bracket system, and is fabricated at our Chelmsford, Essex workshop. On commercial buildings, schools, apartment blocks and industrial units across the South East, this is the heavy duty fitting that holds the coping system together at every T-junction.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 3mm aluminium flat coping T-junction from \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eOnline Metal Store Ltd\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e connects three coping runs at a T-shaped parapet wall intersection. The 75mm external leg matches the standard leg dimension across the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/3mm-aluminium-flat-coping\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm flat coping range\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e. Available in 23 width options from 510mm to 1060mm, covering wider commercial parapet walls. Custom fabricated and powder coated in any RAL colour.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFor narrower domestic walls (under 510mm), see the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-cooping-junction-75mm\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2mm flat coping T-junction\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e which covers widths from 185mm. For standard changes of direction, see the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-75mm\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm coping 135° corner\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e. Browse the full \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/aluminium-copings\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ealuminium copings collection\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eKey Benefits\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003e3mm Heavy Duty Gauge for Wide Parapet Walls\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 3mm thickness provides 50% more rigidity than the 2mm version. On wider parapets (510mm and above), this additional gauge prevents the coping from flexing or drumming in wind. The T-junction spans the widest area of any fitting in the coping system, so the heavier gauge matters most here.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eConnects Three Coping Runs at One Point\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFactory formed to connect the main coping run with a branch wall from one side. Creates a clean, weathertight transition at the intersection without multiple site-cut joints.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003e75mm External Leg for Consistent Profile\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 75mm downstand matches the standard leg dimension across the 3mm flat coping range.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003e23 Width Options for Commercial Walls\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAvailable from 510mm to 1060mm, covering the wider parapet walls found on commercial buildings, apartment blocks and industrial units.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eConcealed Fix Bracket System\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSupplied with fixing brackets. The coping clicks down onto the brackets with no visible screws.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePowder Coated in Any RAL Colour\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eColour matched before dispatch.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUK Manufactured\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFabricated at our workshop in Chelmsford, Essex.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eMaterial: \u003c\/strong\u003e\u003cspan\u003e3mm aluminium (heavy duty)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eType: \u003c\/strong\u003e\u003cspan\u003eFlat coping 90° T-junction (tee piece)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eExternal Leg: \u003c\/strong\u003e\u003cspan\u003e75mm downstand\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eAvailable Widths: \u003c\/strong\u003e\u003cspan\u003e510mm, 535mm, 560mm, 585mm, 610mm, 635mm, 660mm, 685mm, 710mm, 735mm, 760mm, 785mm, 810mm, 835mm, 860mm, 885mm, 910mm, 935mm, 960mm, 985mm, 1010mm, 1035mm, 1060mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eFinish:\u003c\/strong\u003e \u003c\/span\u003e\u003cspan\u003ePolyester powder coated in any RAL colour\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eFixing: \u003c\/strong\u003e\u003cspan\u003eConcealed bracket system (brackets supplied)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eFire Classification: \u003c\/strong\u003e\u003cspan\u003eA2-s1,d0 under BS EN 13501-1\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eManufactured: \u003c\/strong\u003e\u003cspan\u003eChelmsford, Essex, United Kingdom\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003ePrice: \u003c\/strong\u003e\u003cspan\u003eFrom £118.80 ex. VAT (£142.56 inc. VAT)\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003e2mm vs 3mm Coping T-Junction: Which Do I Need?\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003e2mm T-Junction\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSuitable for narrower domestic and light commercial parapet walls. Width options from 185mm. Lower cost. See the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-cooping-junction-75mm\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2mm flat coping T-junction\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003e3mm T-Junction (This Product)\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eDesigned for wider commercial parapet walls from 510mm. The heavier gauge prevents flexing on wide spans and provides greater wind resistance. Choose 3mm when the wall width exceeds 500mm or when the specification calls for heavy duty coping.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eHow to Fit a 3mm Aluminium Coping T-Junction\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFix the supplied brackets to the top of the wall at the T-junction intersection. Apply EPDM seal tape to the brackets. Click the T-junction piece down onto the brackets, ensuring it seats firmly and aligns with the coping runs on all three sides. Leave a 2 to 3mm expansion gap between the T-junction and each adjoining coping length.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEnsure the waterproof membrane underneath is correctly detailed before fitting. For full step by step guidance, see the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/blogs\/news\/how-to-install-aluminium-coping\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ehow to install aluminium coping guide\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhere 3mm Coping T-Junctions Are Used\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eCommercial Buildings with Wide Parapets\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOffice blocks, retail units and industrial buildings with parapet walls over 500mm wide. The 3mm gauge provides the rigidity needed at T-junctions on these wider spans.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eApartment Blocks and High Rise Residential\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOn apartment buildings across Chelmsford, Brentwood, Colchester and the South East where the parapet is a prominent architectural feature. The A2-s1,d0 fire classification makes 3mm aluminium coping suitable for buildings of any height.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eSchools and Public Buildings\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOn publicly funded projects where heavy duty specification and long service life are requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eFrequently Asked Questions\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eWhat is the difference between 2mm and 3mm coping T-junctions?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 3mm version is 50% thicker, providing greater rigidity on wider parapet walls. The 2mm version is suitable for narrower walls (from 185mm). The 3mm version starts at 510mm width and is designed for commercial applications where the wider span needs a heavier gauge. See the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-cooping-junction-75mm\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2mm T-junction\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e for narrower walls.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eWhen do I need a 3mm coping T-junction?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eWhen the parapet wall width exceeds 500mm, when the specification calls for heavy duty coping, or on exposed commercial buildings where wind loading is a concern. For domestic walls under 500mm, the 2mm version is usually sufficient.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eWhat size 3mm coping T-junction do I need?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eMeasure the wall thickness and select the matching width from the 23 options (510mm to 1060mm). The overall coping width includes the 75mm downstand and returns on each side.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eHow do you fit a 3mm coping T-junction?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFix brackets to the wall top. Apply EPDM tape. Click the T-junction down. Leave a 2 to 3mm expansion gap on all three sides.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eCan the 3mm coping T-junction be colour matched?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYes. Powder coated in any RAL colour.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003ePart of a Complete Flat Coping System\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 3mm T-junction is one fitting in the heavy duty flat coping system:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/3mm-aluminium-flat-coping\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Flat Coping 3m Length\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e – main coping length\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-75mm\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Coping 135° Corner\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e – change of direction\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-t-junction\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Coping T-Junction\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e – this product\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/4mm-aluminium-coping-bracket\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eCoping Bracket\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e – concealed fixing bracket\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eBrowse the full \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/aluminium-copings\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ealuminium copings collection\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e. The coping system works alongside \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/fascia-soffits\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ealuminium fascia and soffits\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e, \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-roof-edge-drip-trim-3m\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003edrip trims\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e and the full \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/rainwater-goods\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003erainwater goods range\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e. For a completed project, see the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/mellish-street-aluminium-coping-case-study-london\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eMellish Street coping case study\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eStandards and Compliance\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eThe powder coat finish is applied in line with \u003ca href=\"https:\/\/www.bsigroup.com\/en-GB\/standards\/bs-en-12206-1\/\" target=\"_blank\" rel=\"noopener\"\u003eBS EN 12206-1\u003c\/a\u003e for powder organic coatings on aluminium. The coping system achieves a fire classification of A2-s1,d0 under BS EN 13501-1, making it non-combustible and suitable for buildings of any height including high rise residential over 18 metres.\u003c\/p\u003e","brand":"Online Metal Store","offers":[{"title":"510mm","offer_id":42314566860884,"sku":"AC3-T90-75-510","price":118.8,"currency_code":"GBP","in_stock":true},{"title":"535mm","offer_id":42314566893652,"sku":"AC3-T90-75-535","price":123.12,"currency_code":"GBP","in_stock":true},{"title":"560mm","offer_id":42314566926420,"sku":"AC3-T90-75-560","price":127.44,"currency_code":"GBP","in_stock":true},{"title":"585mm","offer_id":42314566959188,"sku":"AC3-T90-75-585","price":131.76,"currency_code":"GBP","in_stock":true},{"title":"610mm","offer_id":42314566991956,"sku":"AC3-T90-75-610","price":136.08,"currency_code":"GBP","in_stock":true},{"title":"635mm","offer_id":42314567024724,"sku":"AC3-T90-75-635","price":140.4,"currency_code":"GBP","in_stock":true},{"title":"660mm","offer_id":42314567057492,"sku":"AC3-T90-75-660","price":144.72,"currency_code":"GBP","in_stock":true},{"title":"685mm","offer_id":42314567090260,"sku":"AC3-T90-75-685","price":149.04,"currency_code":"GBP","in_stock":true},{"title":"710mm","offer_id":42314567123028,"sku":"AC3-T90-75-710","price":153.36,"currency_code":"GBP","in_stock":true},{"title":"735mm","offer_id":42314567155796,"sku":"AC3-T90-75-735","price":157.68,"currency_code":"GBP","in_stock":true},{"title":"760mm","offer_id":42314567188564,"sku":"AC3-T90-75-760","price":162.0,"currency_code":"GBP","in_stock":true},{"title":"785mm","offer_id":42314567221332,"sku":"AC3-T90-75-785","price":166.32,"currency_code":"GBP","in_stock":true},{"title":"810mm","offer_id":42314567254100,"sku":"AC3-T90-75-810","price":170.64,"currency_code":"GBP","in_stock":true},{"title":"835mm","offer_id":42314567286868,"sku":"AC3-T90-75-835","price":174.96,"currency_code":"GBP","in_stock":true},{"title":"860mm","offer_id":42314567319636,"sku":"AC3-T90-75-860","price":179.28,"currency_code":"GBP","in_stock":true},{"title":"885mm","offer_id":42314567352404,"sku":"AC3-T90-75-885","price":183.6,"currency_code":"GBP","in_stock":true},{"title":"910mm","offer_id":42314567385172,"sku":"AC3-T90-75-910","price":187.92,"currency_code":"GBP","in_stock":true},{"title":"935mm","offer_id":42314567417940,"sku":"AC3-T90-75-935","price":192.24,"currency_code":"GBP","in_stock":true},{"title":"960mm","offer_id":42314567450708,"sku":"AC3-T90-75-960","price":196.56,"currency_code":"GBP","in_stock":true},{"title":"985mm","offer_id":42314567483476,"sku":"AC3-T90-75-985","price":200.88,"currency_code":"GBP","in_stock":true},{"title":"1010mm","offer_id":42314567516244,"sku":"AC3-T90-75-1010","price":205.2,"currency_code":"GBP","in_stock":true},{"title":"1035mm","offer_id":42314567549012,"sku":"AC3-T90-75-1035","price":209.52,"currency_code":"GBP","in_stock":true},{"title":"1060mm","offer_id":42314567581780,"sku":"AC3-T90-75-1060","price":213.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0647\/1588\/2580\/files\/Flat_20Coping_20-_20T-Junction.jpg?v=1774517154","url":"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-t-junction","provider":"Online Metal Store Ltd","version":"1.0","type":"link"}