{"product_id":"aluminium-coping-corner","title":"3mm Aluminium Sloping Coping – 90° External Corner | 100mm External Leg","description":"\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 90° external corner piece for the commercial 3mm sloping coping system. It sits at every right-angle outside corner of the parapet, carrying the same 100mm external leg and built-in slope as the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-3m-length\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3m lengths\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e, \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/3mm-aluminium-coping-2m\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2m sections\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e and \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/3mm-aluminium-coping-1m-length\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e1m pieces\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e in the same 3mm system. Without it, the straight sections have no clean way to turn the corner of a commercial parapet. One corner piece is required per right-angle external corner on the parapet plan.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAvailable in the same 23 commercial width sizes as the straight lengths, from 510mm to 1060mm, powder coated in any RAL colour, and fabricated to order at the Online Metal Store Ltd facility in Chelmsford. This corner is specific to the 3mm sloping coping system and is not compatible with the 2mm system. The 2mm version of this corner is the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-90-degree\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e90° external corner for the 2mm 100mm system\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003e2mm or 3mm Corner: Are You on the Right Page?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 2mm and 3mm sloping coping systems use different corner profiles with different wall thicknesses. They are not interchangeable. Fitting a 2mm corner on a 3mm run, or vice versa, produces a mismatch at the junction and does not seat correctly. You need the corner that matches the gauge of your straight coping lengths.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eUse the 2mm Corner When\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYour straight coping lengths are 2mm gauge. The 2mm system covers domestic and light commercial parapets with coping girths from 185mm to 885mm. The \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-90-degree\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2mm sloping coping 90° external corner for the 100mm system\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e is the correct component for those installations.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eUse This 3mm Corner When\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYour straight coping lengths are 3mm gauge. The 3mm system covers commercial parapets in the 510mm to 1060mm size range, NHBC new-build housing with heavier specifications, exposed and coastal sites, and elevated buildings where wind uplift forces require the heavier gauge. Every component in a 3mm installation must be 3mm gauge throughout: lengths, corners, stopends and the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/5mm-aluminium-coping-bracket\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e5mm coping bracket\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e. Do not substitute 2mm accessories.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eExternal Corner or Internal Corner?\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eExternal Corner (This Product)\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSits at an outside angle of the parapet, where the building wall projects outward and the coping wraps around the corner of the structure. Standing and looking at the building from the outside, the corner sticks toward you. On most commercial buildings with a rectangular or near-rectangular plan, all perimeter parapet corners are external corners.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eInternal Corner\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSits at a re-entrant angle in the parapet plan, where the coping profile turns inward. These appear on buildings with complex plan forms, stepped parapets, projecting structural elements, and L-shaped or U-shaped layouts. If the parapet corner angles away from you as you look at the building, it is an internal corner. The \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-90-intern\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm 90° internal corner\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e is available from the same range.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eKey Benefits\u003c\/span\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e3mm gauge throughout: \u003c\/span\u003e\u003cspan\u003ematches the 3mm straight lengths in rigidity and commercial specification. A 2mm corner in a 3mm run is under-specified and dimensionally mismatched.\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\u003cspan\u003eFlush profile at the corner: \u003c\/span\u003e\u003cspan\u003ethe 100mm overhang and slope carry around the 90° turn without reduction. The profile width at the corner matches the adjacent straight sections exactly.\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\u003cspan\u003eBuilt-in slope resolves at the corner: \u003c\/span\u003e\u003cspan\u003esurface drainage continues through the corner piece in both directions, preventing water from sitting at the junction.\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\u003cspan\u003e23 commercial sizes matching the lengths: \u003c\/span\u003e\u003cspan\u003esame 510mm to 1060mm range. Order the same size as your 3mm straight sections.\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\u003cspan\u003eFactory-formed watertight junction: \u003c\/span\u003e\u003cspan\u003emore reliable than a site-mitred corner. The profile is dimensionally consistent and seals correctly with a sealant bead on each leg.\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\u003cspan\u003eAny RAL colour, batch-matched: \u003c\/span\u003e\u003cspan\u003eorder in the same RAL as all other 3mm system components for colour-consistent arrival from the same Chelmsford coating run.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\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 grade aluminium\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eProfile: \u003c\/strong\u003e\u003cspan\u003eSloping coping corner\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eCorner Angle:\u003c\/strong\u003e \u003c\/span\u003e\u003cspan\u003e90 degrees external\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eExternal Leg:\u003c\/strong\u003e \u003c\/span\u003e\u003cspan\u003e100mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eInternal Leg:\u003c\/strong\u003e \u003c\/span\u003e\u003cspan\u003e75mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWidth Sizes: \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 (23 sizes in 25mm increments)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eSize Rule: \u003c\/strong\u003e\u003cspan\u003eOrder the same size as your 3mm straight coping lengths\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eSizing Formula: \u003c\/strong\u003e\u003cspan\u003eWall width + 195mm = size to order (100mm external leg + 75mm internal leg + 10mm + 10mm returns = 195mm)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWall Width Range: \u003c\/strong\u003e\u003cspan\u003eApproximately 315mm to 865mm\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eFinish:\u003c\/strong\u003e \u003c\/span\u003e\u003cspan\u003ePolyester powder coating, external grade\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eColour: \u003c\/strong\u003e\u003cspan\u003eAny RAL colour to order\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eCompatible Bracket: \u003c\/strong\u003e\u003cspan\u003e5mm Aluminium Coping Bracket (required for all 3mm coping)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eCompatible System: \u003c\/strong\u003e\u003cspan\u003e3mm Aluminium Sloping Coping | 100mm External Leg only\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eNot Compatible With: \u003c\/strong\u003e\u003cspan\u003e2mm sloping coping system -- different gauge and profile dimensions\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eFabrication:\u003c\/strong\u003e \u003c\/span\u003e\u003cspan\u003eMade to order -- non-returnable unless faulty\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eCountry of Origin: \u003c\/strong\u003e\u003cspan\u003eUnited Kingdom (Chelmsford, Essex)\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eGetting the Size Right\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe 23 sizes refer to the overall WIDTH of the coping profile at the corner, from external leg tip to internal leg tip. Order the same size as your straight 3mm coping lengths. The formula is wall width + 195mm, the same as for the straight lengths in this 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\u003cspan\u003eMeasure the parapet wall width at the top from outside face to inside face.\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\u003cspan\u003eAdd 100mm (external leg) + 75mm (internal leg) + 10mm + 10mm (returns) = 195mm.\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\u003cspan\u003eWall width + 195mm = the size to order. A 315mm wide commercial parapet gives 510mm. A 415mm wall gives 610mm. A 540mm wall gives 735mm.\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\u003cspan\u003eIf the result falls below 510mm, the parapet is likely in the domestic 2mm system range.\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\u003cspan\u003eIf the result falls between two available sizes, select the next size up.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eHow Many Corner Pieces Do You Need?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCount the right-angle external corners on the parapet plan. One corner piece per corner. On a rectangular commercial perimeter, that is four pieces. On a more complex plan form, count each external corner separately and note any internal corners, which need the internal corner product.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eSimple rectangular commercial parapet: 4 external corners.\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\u003cspan\u003eBuilding with a projecting element (e.g. stair enclosure): additional external corners at each angle of the projection.\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\u003cspan\u003eStepped parapet: count each external step angle separately.\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\u003cspan\u003eAny obtuse angle (not 90 degrees): use the 135 degree corner, not 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\u003cspan\u003eRe-entrant angles: use the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-90-intern\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm 90° internal corner\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eInstallation\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eFix the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/5mm-aluminium-coping-bracket\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e5mm aluminium coping brackets\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e along the run in the normal way. Position a bracket within 150-200mm of the corner piece on each leg of the adjacent straight sections. The corner piece does not require a separate bracket beneath it: the brackets on the adjacent lengths provide the support at the corner position.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003ePress the corner piece into position at the junction. Butt the straight sections up to it from each leg and apply a continuous bead of \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/colour-coded-sealant-300ml\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ecolour coded sealant\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e in the matching RAL to the internal face of both joints. Both legs of the corner must be sealed: the corner faces weather on two elevations simultaneously and both joints are part of the weathertight line.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eLock the adjacent straight sections to their brackets using \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/metal-fasteners-ral-pack-25\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ecolour coded metal fasteners\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e in the matching RAL. Apply a finishing sealant bead on both external joint faces at the corner. On a commercial development with multiple plots or a long perimeter run, work corner by corner systematically and complete the sealant at each one before moving on.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhere This Corner Piece Is Used\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eCommercial Flat Roof Parapets\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe primary application. On a commercial office, retail unit, or mixed-use building with a perimeter flat roof parapet, this corner appears at every right-angle turn in the parapet plan. It is ordered as part of the full 3mm sloping coping system alongside the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-3m-length\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3m primary lengths\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e, \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/3mm-aluminium-coping-2m\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2m sections\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e, \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/3mm-aluminium-coping-1m-length\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e1m infill pieces\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e, stopends and brackets. The \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/aluminium-coping-case-study\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ealuminium coping case study\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e shows a completed commercial coping installation on a live UK project.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eNHBC New-Build Housing Developments\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOn NHBC-registered residential developments where the house type specification calls for 3mm sloping coping, this corner piece appears at every right-angle parapet corner on each unit. Housebuilders ordering the full system per phase, including lengths, corners, \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-stopend-100mm-3m\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eclosed stopends\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e and \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/5mm-aluminium-coping-bracket\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e5mm brackets\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e, get colour-matched, dimensionally consistent components from the same Chelmsford manufacturing run. The \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/aluminium-sloped-coping-case-study-london\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003ealuminium sloped coping case study\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e demonstrates the system at residential development scale.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003e\u003cspan\u003eExposed and Coastal Sites\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOn buildings near the Essex or Kent coast, or on elevated exposed sites where 3mm has been specified for wind loading reasons, the corner piece maintains that specification at every right-angle turn. The corner faces the full force of two wall elevations simultaneously, making a factory-formed 3mm gauge piece the correct choice at this position.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhy a Factory Corner Matters on a Commercial Parapet\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe corner is the weakest point in any coping run. Two wall faces meet at the corner junction and water driven from any direction finds the joint first. A site-mitred corner between two straight 3mm sections relies on accurate cutting and field application of sealant at the most critical position on the parapet. A factory-formed corner profile removes that dependency: the profile is pressed to the correct 100mm leg dimensions with the slope resolved accurately through the 90° turn, and the joint is sealed in the same way as every other joint in the run.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOn a commercial project with a 30-year expected service life, the corner junction is the position most likely to show early failure if the detail is not correct from installation day. Getting a factory-formed corner piece of the correct gauge is the straightforward way to take that risk off the table.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eWhy Choose Online Metal Store Ltd\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAll 3mm sloping coping components are manufactured at our Chelmsford facility, including the corner pieces. They are fabricated to the same dimensional specification as the straight lengths and finished in the same external grade polyester powder coat process. Ordering corners alongside lengths, stopends and brackets in the same RAL at the same time means every component is coated in the same batch and arrives on site colour-matched. Contact our team at \u003c\/span\u003e\u003cspan\u003esales@onlinemetalstore.co.uk\u003c\/span\u003e\u003cspan\u003e or call +44 7907 239290, Monday to Saturday 6:30am to 4:30pm, to confirm your corner count, check your sizing, or quote for the complete 3mm system.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eComplete Your 3mm Sloping Coping 100mm System\u003c\/span\u003e\u003c\/h4\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-coping-1m-length\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloping Coping – 1m Length | 100mm External Leg\u003c\/span\u003e\u003c\/a\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\/3mm-aluminium-coping-2m\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloping Coping – 2m Length | 100mm External Leg\u003c\/span\u003e\u003c\/a\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-3m-length\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloping Coping – 3m Length | 100mm External Leg\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n\u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e3mm Sloping Coping – 90° External Corner | 100mm External Leg (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\/aluminium-coping-corner-90-intern\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloping Coping – 90° Internal Corner | 100mm External Leg\u003c\/span\u003e\u003c\/a\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-100mm\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloping Coping – 135° External Corner | 100mm External Leg\u003c\/span\u003e\u003c\/a\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-135-incl\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloping Coping – 135° Internal Corner | 100mm External Leg\u003c\/span\u003e\u003c\/a\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-stopend-100mm-3m\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloped Coping – Left Handed Closed Stopend | 100mm External Leg\u003c\/span\u003e\u003c\/a\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\/3mm-aluminium-coping-stopend-100mm\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm Sloped Coping – Right Handed Closed Stopend | 100mm External Leg\u003c\/span\u003e\u003c\/a\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\/5mm-aluminium-coping-bracket\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e5mm Aluminium Coping Bracket\u003c\/span\u003e\u003c\/a\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\/colour-coded-sealant-300ml\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eColour Coded Sealant 300ml\u003c\/span\u003e\u003c\/a\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\/metal-fasteners-ral-pack-25\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eColour Coded Metal Fasteners\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIf you are using the 2mm sloping coping system, the correct corner is the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-90-degree\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2mm 90° external corner for the 100mm system\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e. For the full sloping coping range across both gauges and all leg sizes, visit the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/aluminium-sloping-coping\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eAluminium Sloping Coping collection page\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e and the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/aluminium-copings\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eAluminium Copings overview\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003cb\u003e\u003c\/b\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\u003eCan I use this 3mm corner with 2mm coping lengths?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eNo. The 2mm and 3mm sloping coping profiles have different wall thicknesses. A 3mm corner on a 2mm installation does not produce a flush junction. All components on a 3mm installation must be 3mm gauge. Equally, a 2mm corner on a 3mm installation is under-specified for the conditions that required 3mm in the first place. For the 2mm system, use the \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-90-degree\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e2mm 90° external corner\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eWhat size 3mm corner do I order?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe same size as your straight 3mm coping lengths: wall width + 195mm. A 315mm wide commercial parapet gives 510mm, the smallest available size. A 415mm wall gives 610mm. A 540mm wall gives 735mm. The 23 sizes are coping widths, not run lengths. If you have already worked out the size for your straight sections, order the same size for the corners.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eWhat bracket do I use with the 3mm corner?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/5mm-aluminium-coping-bracket\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e5mm aluminium coping bracket\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e is the correct bracket for all 3mm sloping coping components, including corner pieces. Do not use the 4mm bracket, which is for 2mm coping only. Position brackets within 150-200mm of the corner piece on each leg of the adjacent straight sections.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eHow many corner pieces does a standard commercial parapet need?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eOne per right-angle external corner on the parapet plan. A standard rectangular commercial parapet has four corners and needs four pieces. On buildings with projecting elements, stepped parapets or complex plan forms, count each external corner separately. Re-entrant angles and obtuse angles need different products.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eDo I need to seal both legs of the corner?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eYes. Apply colour coded sealant to the internal face of both joints where the straight sections butt up to the corner piece. The corner faces weather from both wall elevations and both joint lines are weathertight seals. Sealing only one leg leaves the other open to driven rain at the most exposed position on the parapet.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch4 dir=\"ltr\"\u003e\u003cspan\u003eWhat is the difference between an external and internal corner?\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eAn external corner sits at an outside angle of the parapet, where the wall projects outward. An internal corner sits at a re-entrant angle, where the parapet turns inward. Most standard commercial buildings have only external corners at the perimeter parapet. Internal corners appear on buildings with complex plan forms. The \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner-90-intern\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003e3mm 90° internal corner\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e is available from the same 3mm sloping coping range.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e\u003cspan\u003eReady to Order?\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eSelect the size matching your straight 3mm coping lengths from the dropdown above, choose your RAL colour, and add to basket. To confirm your corner count, discuss the full 3mm system specification, or get a quote for lengths, corners, stopends and brackets together, contact our team at \u003c\/span\u003e\u003cspan\u003esales@onlinemetalstore.co.uk\u003c\/span\u003e\u003cspan\u003e or call +44 7907 239290, Monday to Saturday 6:30am to 4:30pm.\u003c\/span\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eCustom Fabricated Item: \u003c\/span\u003e\u003cspan\u003eMade to order at our Chelmsford facility. Please check your measurements carefully before ordering. Non-returnable unless faulty. See our \u003c\/span\u003e\u003ca href=\"https:\/\/onlinemetalstore.co.uk\/pages\/returns-policy\" target=\"_blank\" rel=\"noopener\"\u003e\u003cspan\u003eRefund and Returns Policy\u003c\/span\u003e\u003c\/a\u003e\u003cspan\u003e for full details.\u003c\/span\u003e\u003c\/p\u003e","brand":"Online Metal Store Ltd","offers":[{"title":"510mm","offer_id":42314536845396,"sku":"AC3-E90-100-510","price":90.0,"currency_code":"GBP","in_stock":true},{"title":"535mm","offer_id":42314536878164,"sku":"AC3-E90-100-535","price":95.4,"currency_code":"GBP","in_stock":true},{"title":"560mm","offer_id":42314536910932,"sku":"AC3-E90-100-560","price":100.8,"currency_code":"GBP","in_stock":true},{"title":"585mm","offer_id":42314536943700,"sku":"AC3-E90-100-585","price":106.2,"currency_code":"GBP","in_stock":true},{"title":"610mm","offer_id":42314536976468,"sku":"AC3-E90-100-610","price":111.6,"currency_code":"GBP","in_stock":true},{"title":"635mm","offer_id":42314537009236,"sku":"AC3-E90-100-635","price":117.0,"currency_code":"GBP","in_stock":true},{"title":"660mm","offer_id":42314537042004,"sku":"AC3-E90-100-660","price":122.4,"currency_code":"GBP","in_stock":true},{"title":"685mm","offer_id":42314537074772,"sku":"AC3-E90-100-685","price":127.8,"currency_code":"GBP","in_stock":true},{"title":"710mm","offer_id":42314537107540,"sku":"AC3-E90-100-710","price":133.2,"currency_code":"GBP","in_stock":true},{"title":"735mm","offer_id":42314537140308,"sku":"AC3-E90-100-735","price":138.6,"currency_code":"GBP","in_stock":true},{"title":"760mm","offer_id":42314537173076,"sku":"AC3-E90-100-760","price":144.0,"currency_code":"GBP","in_stock":true},{"title":"785mm","offer_id":42314537205844,"sku":"AC3-E90-100-785","price":149.4,"currency_code":"GBP","in_stock":true},{"title":"810mm","offer_id":42314537238612,"sku":"AC3-E90-100-810","price":154.8,"currency_code":"GBP","in_stock":true},{"title":"835mm","offer_id":42314537271380,"sku":"AC3-E90-100-835","price":160.2,"currency_code":"GBP","in_stock":true},{"title":"860mm","offer_id":42314537304148,"sku":"AC3-E90-100-860","price":165.6,"currency_code":"GBP","in_stock":true},{"title":"885mm","offer_id":42314537336916,"sku":"AC3-E90-100-885","price":171.0,"currency_code":"GBP","in_stock":true},{"title":"910mm","offer_id":42314537369684,"sku":"AC3-E90-100-910","price":176.4,"currency_code":"GBP","in_stock":true},{"title":"935mm","offer_id":42314537402452,"sku":"AC3-E90-100-935","price":181.8,"currency_code":"GBP","in_stock":true},{"title":"960mm","offer_id":42314537435220,"sku":"AC3-E90-100-960","price":187.2,"currency_code":"GBP","in_stock":true},{"title":"985mm","offer_id":42314537467988,"sku":"AC3-E90-100-985","price":192.6,"currency_code":"GBP","in_stock":true},{"title":"1010mm","offer_id":42314537500756,"sku":"AC3-E90-100-1010","price":198.0,"currency_code":"GBP","in_stock":true},{"title":"1035mm","offer_id":42314537533524,"sku":"AC3-E90-100-1035","price":203.4,"currency_code":"GBP","in_stock":true},{"title":"1060mm","offer_id":42314537566292,"sku":"AC3-E90-100-1060","price":208.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0647\/1588\/2580\/files\/Aluminium_20Coping_20-_20100mm_20-_20125mm_20External_20Leg_20-_2090-Degree_20External_20Corner-1.png?v=1774517106","url":"https:\/\/onlinemetalstore.co.uk\/products\/aluminium-coping-corner","provider":"Online Metal Store Ltd","version":"1.0","type":"link"}