2mm Aluminium Sloping Coping – 1m Length | 100mm External Leg - Online Metal Store Ltd

2mm Aluminium Sloping Coping – 1m Length | 100mm External Leg

£33.73
(£40.48 Inc VAT)

2mm Aluminium Sloping Coping – 1m Length | 100mm External Leg

Aluminium sloping coping is available from Online Metal Store Ltd in 1m, 2m and 3m lengths. Most buyers reach for the 3m length first and order enough to cover the run, which is the right call on a long, uninterrupted parapet. But on a short return wall, a box dormer front face, a small outbuilding parapet, or the final infill section of a longer run that does not divide neatly into 3m, the 1m length is the practical choice. Ordering a 3m length for a 1.2m wall run and cutting 1.8m of waste is not economical and it does not produce a better result. The 1m section, combined with the 2m length and 3m length, gives you the flexibility to plan the run correctly, minimise waste, and reduce the number of joints on the installed parapet.

This 2mm aluminium sloping coping in a 1m length is the standard entry into the sloping coping system for short runs and infill sections. It carries the same built-in slope, the same 100mm external leg, and the same 29 available width sizes as the longer lengths. It is manufactured in Chelmsford, Essex, and available powder coated in any RAL colour to match the full system. All the same rules about size selection, bracket spacing, sealant application and system compatibility apply whether you are ordering 1m or 3m sections.

What Aluminium Sloping Coping Does

A parapet wall without coping is a wall with an exposed top edge. Rain soaks in, frost cycles open up mortar joints, and water works its way down through the wall construction. Coping caps the top of the wall and directs water clear of the wall face and the flat roof waterproofing layer below. Sloping coping does this with a built-in slope across the top surface, tilting toward the external face so rainwater runs off the front of the wall rather than sitting on the coping or draining back toward the roof membrane. On a domestic rear extension, a box dormer, a boundary wall, or any parapet where positive surface drainage is preferred, sloping coping is the right choice.

The 2mm gauge with a 100mm external leg is the standard domestic specification for sloping coping. It provides the right balance of rigidity, weight and cost for residential and light commercial parapet work across Essex, East London and the South East. The full system includes lengths in three sizes, four corner types, left and right handed stopends, stopend upstands, and the 4mm coping bracket that provides the concealed fixing mechanism. All components are powder coated to any RAL colour at the Chelmsford facility.

Key Benefits

1m Sections for Precise Waste Control

The 1m length allows you to plan a coping run with precision. On a parapet that measures 7.4m, for example, ordering two 3m lengths and one 1m length with a short cut gives you three joints and minimal waste. Ordering three 3m lengths and cutting 1.6m of waste from the last section costs more in material and produces no installation advantage. On made-to-order coping where every length is fabricated to your chosen width, controlling the run layout from the outset makes both commercial and practical sense.

Built-In Slope for Active Drainage

The sloped top surface of this coping directs rainwater toward the external face of the parapet rather than allowing it to sit level on the coping surface. On an exposed parapet in the UK climate, active surface drainage reduces the risk of water penetrating joints under standing water pressure, prevents the staining and algae growth that still water encourages on any surface, and reduces the freeze-thaw stress that open water on a flat or near-flat surface imposes on joints and sealant over time. The slope is built into the aluminium profile: it requires no additional design and no site adjustment.

Concealed Fixing with a Clean Finished Line

The sloping coping profile is designed to be fixed using a concealed bracket system. The 4mm aluminium coping bracket is fixed to the top of the parapet wall before the coping is installed; the coping then presses or clips down onto the brackets from above. No fastener penetrates the top or face surface of the installed coping. The result is a clean, unbroken coping line with no visible hardware, no holes in the aluminium, and no fastener penetrations that could become water ingress points as sealants age.

100mm External Leg for Balanced Overhang

The 100mm external leg provides 100mm of overhang beyond the outside face of the parapet wall, carrying the drip edge well clear of the wall face below. This is the standard external leg for domestic and light commercial sloping coping in the UK and is appropriate for parapet walls up to around 300mm wide where the leg proportions produce a balanced, well-scaled profile. For wider walls or projects where the specification calls for a more substantial overhang, the 125mm external leg system is available from the same range.

Any RAL Colour, Matched Across the Full System

Available in any RAL colour with an external grade polyester powder coat finish. Ordering the 1m sections alongside the 2m lengths, 3m lengths, corners, stopends and brackets in the same RAL colour ensures all components are finished in the same batch at Chelmsford and arrive colour-matched across the full system. On a visible parapet where colour consistency across every component matters, single-batch ordering is the most reliable way to achieve it.

UK Manufactured in Chelmsford, Made to Order

Every length is fabricated to the width you select and the RAL colour you specify at the Online Metal Store Ltd facility in Chelmsford, Essex. As with all components in the sloping coping range, this is a made-to-order custom fabrication and is non-returnable unless faulty. Measuring the wall width correctly before ordering, and understanding the size selection guide below, is essential on a product where the wrong size cannot be exchanged.

Technical Specifications

Material: 2mm grade aluminium

Profile: Sloping coping length

Length: 1m (1000mm)

External Leg: 100mm

Internal Leg: 75mm

Width Sizes Available: 185mm, 210mm, 235mm, 260mm, 285mm, 310mm, 335mm, 360mm, 385mm, 410mm, 435mm, 460mm, 485mm, 510mm, 535mm, 560mm, 585mm, 610mm, 635mm, 660mm, 685mm, 710mm, 735mm, 760mm, 785mm, 810mm, 835mm, 860mm, 885mm (29 sizes in 25mm increments)

Size Note: The "size" refers to the overall WIDTH of the coping profile (wall width + 195mm), NOT the length of the run. All lengths in the range are 1m long; the size selected determines the coping girth to fit your wall width.

Finish: Polyester powder coating, external grade

Colour: Any RAL colour to order

Compatible Bracket: 4mm Aluminium Coping Bracket (2mm coping system)

Fabrication: Made to order - non-returnable unless faulty

Country of Manufacture: United Kingdom (Chelmsford, Essex)

Understanding the Size: Width, Not Run Length

The 29 size options from 185mm to 885mm on this product refer to the overall WIDTH of the coping profile, meaning the distance across the top of the coping from the tip of the external leg to the tip of the internal leg. They do not refer to the length of the run. Every length on this page is 1m long regardless of which size you select.

The width size must match the overall girth of your parapet wall construction. The calculation:

  • Measure the wall width at the top of the parapet, from outside face to inside face.

  • Add 100mm for the external leg and 75mm for the internal leg = 175mm.

  • Add 10mm for each return (10mm + 10mm = 20mm).

  • Total: wall width + 195mm = the coping width size to select. A 190mm wide parapet wall gives 190 + 195 = 385mm. Select the 385mm size. A 265mm wall gives 265 + 195 = 460mm.

  • If the result falls between two available sizes, select the next size up.

  • Quickest site method: measure directly across the top of an existing coping length (if available) or across an installed bracket on the wall. That measurement is the size to order.

1m, 2m or 3m: Choosing the Right Length for Your Run

All three lengths are available in the same 100mm external leg sloping coping profile and the same 29 width sizes. The length choice should be driven by the run layout, not by habit or convenience. Here is a practical guide:

When to Use the 3m Length

The 3m length is the most efficient choice for continuous parapet runs of 3m or more where the run divides reasonably well into 3m sections. On a 9m rear extension parapet, three 3m lengths give you two joints and zero waste. On a 12m perimeter run, four 3m lengths give you three joints. Fewer joints means less sealant, fewer potential failure points, and a cleaner installed line. Always start the run planning with 3m lengths and work down to shorter sections for the infill.

When to Use the 2m Length

The 2m length covers the gap between 1m and 3m. On a 7m parapet run, ordering three 2m lengths and one 1m length gives you four joints and almost no waste, which is more economical than two 3m lengths and a 1m at roughly the same joint count. The 2m length also suits box dormers and medium-span parapet sections where a 3m would be unwieldy and a 1m too short.

When to Use the 1m Length (This Product)

The 1m length earns its place in three scenarios. First, as the infill section at the end of a run that does not divide neatly into longer lengths. Second, on genuinely short parapet sections, such as the side walls of a box dormer, a small garden wall section, or a narrow return, where a 1m section is the entire run. Third, on tight-access or awkward installation positions where a longer length is physically difficult to handle or manoeuvre into place. Keep 1m lengths for these scenarios rather than as a substitute for 3m on longer runs, where the additional joints they create serve no practical purpose.

How to Install 2mm Sloping Coping Lengths

Mark out the bracket positions along the parapet run before fixing anything. Fix the 4mm aluminium coping brackets at the correct centres, not exceeding 1000mm, with brackets within 150-200mm of every run end, corner junction, and stopend position. On a 1m length, you will typically need two brackets, one near each end. Confirm that all brackets are flat to the wall top and that the alignment line is true before pressing any coping into place.

Press the coping lengths down onto the brackets, working along the run from the fixed terminal end. Before butting each length up to the previous one, apply a continuous bead of colour coded sealant in the matching RAL colour to the internal face of the joint. The sealant seals the butt joint between adjacent lengths and is the primary weathertight line at every run joint. Do not rely on the close fit of the profiles as a substitute for sealant: on an exposed parapet, joints without sealant will admit water under driving rain pressure.

Once the run is laid out and sealant-bedded, lock the coping to the brackets using colour coded fasteners in the matching RAL colour at the bracket positions. Fit the left and right handed closed stopends at the terminal ends of the run, and the appropriate corner pieces at every change of direction. Apply a finishing sealant bead on all external joint faces.

Where the 1m Sloping Coping Length Is Used

Infill Sections on Longer Parapet Runs

The most common use for a 1m length is as the infill at the end of a longer parapet run that does not divide into whole 3m or 2m sections. On a 10.6m rear extension parapet across the back of a semi-detached house in Chelmsford or Brentwood, the most efficient layout might be three 3m lengths plus one 1m section, producing four joints and cutting only 400mm of waste from the 1m section rather than 1.4m from a third full 3m length. Planning the run with a mix of lengths saves material cost and reduces off-cuts without adding unnecessary joints.

Short Parapet Returns and Box Dormers

Box dormers on terraced and semi-detached houses across East London, Essex and the wider South East commonly have a front parapet of 1.5m to 2.5m and two short side returns of 300mm to 600mm. The side returns are ideally served by 1m lengths: they are the right size, easy to handle on a narrow working platform at ridge height, and produce a single-piece installation without joints on what is often a tight and visible detail. Ordering a 3m length for a 400mm dormer side return generates significant waste on a made-to-order product.

Small Outbuildings, Garages and Garden Structures

Flat-roofed garages, garden offices and outbuildings often have parapet walls of 1m to 2.5m per face. On a small square garage with four faces each under 2m, four 1m lengths may be more practical and economical than four 3m lengths cut down to size. For a garden wall section of 1.2m, a single 1m length with minimal cutting is the right approach. The 1m length is the natural choice wherever the wall is short enough that a longer section would produce substantial waste on a non-returnable made-to-order product.

Tight-Access and High-Level Parapet Work

On high-level parapet work, particularly on scaffolded two-storey extensions or parapets where access is restricted by adjacent structures, a 3m length can be difficult to handle safely. The 1m length, at a fraction of the weight and a size that one installer can manage without assistance, is the practical choice in these situations. It produces more joints than the 3m equivalent, but on a short run or a complex layout with multiple corners and returns, the colour coded sealant at each joint provides the weathertight performance regardless of how many joints there are.

Sloping Coping or Flat Coping: Which Profile for Your Project?

Both aluminium sloping and flat coping cap the top of a parapet wall and protect it from water ingress. The choice between them comes down to drainage preference, aesthetics, and specification:

Aluminium Sloping Coping

The sloped top surface provides active drainage, directing rainwater off the external face. It gives a distinctive angled profile that suits residential and contemporary commercial architecture. Sloping coping is particularly well suited to domestic parapet walls on extensions and dormers in the South East, where driving rain and the visual quality of the roof detail from street level are both considerations. If you want water to run off the coping visibly and positively, sloping is the right choice. The full 2mm sloping coping range at 100mm external leg, including lengths in all three sizes, is available from the Aluminium Sloping Coping collection page.

Aluminium Flat Coping

The flat top surface gives a clean horizontal profile that is common on commercial buildings and modern architectural projects where a minimalist parapet line is specified. Flat coping relies on the external leg drip detail and properly sealed joints for weathertightness rather than a surface slope. The 2mm flat coping range is available with the same 29 width sizes, the same RAL colour options, and the same concealed bracket system, alongside a 3mm flat coping range for commercial and heavier-spec applications. If the project specification calls for a flat horizontal profile, flat coping is the correct choice.

Frequently Asked Questions

When should I use 1m lengths instead of 3m?

Use the 1m length for short parapet runs of under 1.5m, as the infill section at the end of a longer run that does not divide neatly into 3m or 2m sections, on box dormer side returns, on small outbuildings, and on tight-access installations where a 3m length is difficult to handle. For long, uninterrupted parapet runs, the 3m length is more efficient: fewer joints, less sealant, and lower material cost for the same run.

The product shows 29 "sizes". Does that mean 29 different lengths?

No. All lengths on this page are 1m long. The 29 sizes from 185mm to 885mm refer to the WIDTH of the coping profile, the overall girth from the tip of the external leg to the tip of the internal leg. This must match the overall width of your parapet wall construction. For a 2mm sloping coping with a 100mm external leg and 75mm internal leg with standard 10mm returns, the formula is: wall width + 195mm = the size to order. A 190mm wall width gives 385mm; a 265mm wall gives 460mm.

Can aluminium sloping coping be cut to length on site?

Yes. Aluminium can be cut on site using a fine-toothed hacksaw, a metal-cutting circular saw blade, or an angle grinder with an aluminium-rated cutting disc. Cut at right angles and deburr the cut edge with a file. If the cut produces a visible end on an exposed face, cover it with a stopend rather than leaving the cut aluminium exposed. On a made-to-order coping profile, cutting a 1m length shorter on site is straightforward; the alternative is to order the next available shorter size if your run measurement falls between standard length increments.

Does the 1m length use the same brackets and accessories as the 2m and 3m?

Yes. All three lengths in the 2mm sloping coping 100mm external leg system use the same 4mm aluminium coping bracket, the same colour coded sealant, and the same corners, stopends and upstand stopends. The only difference between a 1m section and a 3m section in the installed system is the number of joints. All other installation procedures, sealant requirements and bracket spacings apply equally to both.

Do I need one bracket per 1m length or more?

For a 1m length, you need a minimum of two brackets: one within 150-200mm of each end of the length. At 1000mm maximum bracket centres, a 1m length with one bracket at each end gives you two brackets at approximately 700-800mm apart, which is within the spacing requirement. If the 1m length is at a run end adjacent to a corner piece or stopend, the bracket near that end should be positioned to give the terminal component solid bearing as well.

Is this product suitable for commercial projects?

The 2mm gauge with a 100mm external leg is the standard domestic and light commercial specification. For commercial projects on larger buildings, exposed sites, or where the architectural or NHBC specification calls for a heavier gauge, the 3mm sloping coping system is the correct specification. For very short infill sections within a predominantly 3mm commercial installation, a 1m section of 3mm coping would be the correct choice to maintain gauge consistency across the full run.

Part of a Complete 2mm Sloping Coping System

This 1m length is one of three available lengths in the 2mm aluminium sloping coping system with a 100mm external leg. A complete parapet installation requires lengths in the appropriate sizes, corner pieces for every change of direction, stopends for every run terminal, brackets at the correct centres, sealant at every joint, and colour coded fasteners. All components ordered from the same Chelmsford manufacturer will arrive in matching colour and compatible dimensions. The full 2mm sloping coping system with 100mm external leg includes:

For the full sloping coping range including 125mm external leg and 3mm versions, visit the Aluminium Sloping Coping collection page. For the sloped coping system at larger scale on a live project, see the aluminium sloped coping case study.

Standards and Compliance

Aluminium parapet coping systems for flat roof construction in the UK are specified and detailed under BS 6229:2018 - Flat Roofs with Continuously Supported Flexible Waterproof Coverings. This standard sets out edge and parapet detailing requirements including coping specification, fixings and joint treatment. A properly installed 2mm aluminium sloping coping system, including correctly jointed and sealant-bedded length sections, is consistent with the weathertight parapet detailing requirements of this standard.

The external grade polyester powder coat finish on all Online Metal Store Ltd sloping coping products meets the requirements of BS EN 12206-1 - Organic Coatings on Aluminium and Aluminium Alloys. This standard governs the performance of external-grade powder coatings on aluminium used in architectural applications. The same coating specification applies across all components ordered together, ensuring colour consistency and equivalent durability across every part of the installed system.

 Download Our Colour Chart

Custom Fabricated Item

This is a custom-fabricated item made to your selected size and finish. Please double-check measurements before ordering. This product is non-returnable unless faulty, as explained in our Refund & Return Policy

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