2mm Aluminium Sloped Coping – Left Handed Stopend Upstand | 125mm External Leg

The end of a coping run is often where a good roofline detail starts to fail. If the open end is cut on site, filled with too much sealant or left without a proper formed closure, driving rain can find its way into the profile and start causing staining, damp marks or messy edge details.

That is a real issue on UK buildings, from rear extensions in Chelmsford and Brentwood to exposed commercial parapets in Basildon, Colchester and East London. This left handed stopend upstand gives the sloped coping run a formed, colour matched finish with a deeper 125mm external leg for better coverage down the outside wall face.

Product Overview

This 2mm aluminium sloped coping left handed stopend upstand is designed to close the left hand end of a coping run where the wall finishes in open view. It is not a decorative extra. It is a practical weathering component that closes the profile, keeps the slope aligned and helps protect the wall head from rain, wind and water entry.

Online Metal Store Ltd supplies this stopend from Chelmsford, Essex, as part of its wider aluminium sloping coping range. It is suitable for roofers, builders, contractors, developers, architects and homeowners who need a clean end detail on parapet walls, roof terraces, boundary walls and modern flat roof extensions.

For a proper system order, pair this component with the matching coping widths, the opposite handed stopend where required, and the correct jointing products. If the other end of the run needs a matching closure, use the right handed 125mm stopend and finish the joints with colour coded sealant where the installation detail calls for it.

Key Benefits

Properly Closes the Left Hand End of the Run

A left handed stopend gives the exposed end of the sloped coping system a formed aluminium closure. It helps avoid open profiles, rough cut edges and heavy sealant build ups that can make a finished roofline look untidy.

125mm External Leg for Extra Face Coverage

The 125mm external leg gives deeper cover down the outer wall face than a 100mm leg. That is useful on wider parapets, rendered walls, insulated upstands and exposed elevations where the edge detail needs more protection and a stronger visual line.

Powder Coated to Match the Coping System

The stopend can be powder coated in the selected RAL colour, helping it match the main coping lengths, corners, fixings and surrounding roof edge details. A matched finish matters when the roofline is visible from ground level, terraces or neighbouring buildings.

Built for UK Weather Conditions

Aluminium is lightweight, corrosion resistant and well suited to external architectural metalwork. When paired with a suitable powder coated finish, it is a practical choice for driving rain, frost cycles, damp conditions and salt laden air in more exposed UK locations.

Easier to Handle on Site

A 2mm aluminium stopend gives a firm formed detail without being overly heavy. That helps installers working at height, especially on smaller parapet sections, extensions and roof terrace edges where access can be tight.

UK Manufactured with Practical Support

Supplying from the UK helps buyers get clearer support on sizes, RAL finishes and system matching. For projects across Essex, Kent, London and the Home Counties, that can reduce delays caused by missing handed parts or mismatched finishing pieces.

Cleaner Than an Improvised Site Closure

A factory formed stopend looks sharper than trying to close the profile with offcuts or a site-made plate. The slope, end face and return are already formed to suit the coping system, giving the installer a cleaner detail to hand over.

Technical Specifications

Product: 2mm Aluminium Sloped Coping, Left Handed Stopend Upstand | 125mm External Leg

Material: 2mm aluminium

Profile Type: Sloped coping stopend with raised upstand and formed end closure

Handing: Left handed

External Leg: 125mm

Internal Leg: Not clearly stated on the live product page. Add the confirmed internal leg measurement to reduce ordering uncertainty.

Finish: Powder coated aluminium, available in selected RAL colour

Available Sizes: 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

Price From: £59.52 ex VAT, £71.42 inc VAT at the time of review

Suitable For: Sloped aluminium coping runs, flat roof parapets, boundary wall heads, roof terrace edges and exposed wall terminations

Manufacturing Location: Chelmsford, Essex, United Kingdom

Important Ordering Note: Confirm width, handing, external leg and RAL colour before ordering because this is a custom fabricated product.

Choosing the Right Size / Width / Thickness

·         Choose the stopend size to match the exact coping width on the run. A 410mm coping width needs the matching 410mm stopend, not a nearby size.

·         Use smaller sizes such as 185mm to 310mm for narrower wall heads, garden walls, single storey extensions and simple domestic parapet details.

·         Use mid range sizes such as 335mm to 535mm for many rear extensions, Victorian terrace projects, Edwardian semis and standard flat roof upstands.

·         Use wider options such as 560mm to 885mm for roof terraces, insulated parapets, schools, care homes, commercial units and larger housing developments.

·         Choose the 125mm external leg where the outside face needs deeper coverage than the 100mm option, especially around render, cladding or thicker wall build ups.

·         Confirm left hand selection by standing in the agreed fitting direction and identifying which end of the run receives the closed face. Handed stopends are easy to order incorrectly if drawings are not checked.

How to Install / How to Fit

Start by checking the roof edge drawing, wall width, fall direction and handed position before fixing anything. Dry fit the left handed stopend with the first adjacent coping length so the external leg, slope and end closure sit correctly on the wall.

Set out corners and the opposite end closure at the same time. If the parapet turns inward, check the 90 degree internal corner with 125mm external leg or the 135 degree internal corner with 125mm external leg before final fixing so the full run follows the correct geometry.

Use suitable colour coded fasteners for timber or colour coded fasteners for metal depending on the substrate and fixing detail. Keep fixing heads consistent with the rest of the coping system so the finished run does not look mixed or unfinished.

Apply colour coded sealant only where the joint detail requires it. Sealant should support the joint, not replace the formed aluminium stopend. Once fixed, wipe back excess material and recheck that water will shed away from the wall face.

Where Aluminium Coping Stopend 125mm Is Used

Domestic Flat Roof Extensions

For extensions in Chelmsford, Brentwood, Billericay and Southend, a left handed stopend helps finish the end of a parapet wall neatly. It gives the aluminium copings a proper closure instead of leaving a visible cut end at the side of the roof.

Commercial Roofline Details

On commercial units in Basildon, Colchester, East London and Central London, exposed parapet ends are easy to see from car parks, service yards and neighbouring buildings. A colour matched stopend helps the run look specified rather than patched together.

Roof Terraces and Deep Wall Builds

The 125mm external leg works well where the outside face needs more cover, such as insulated roof terraces, apartments and larger parapet build ups. It can sit alongside related trims, flashings and angles used to finish roof edges, abutments and surrounding details.

Boundary Walls and Entrance Features

A left handed sloped stopend is also useful on boundary walls where one end of the wall finishes in clear view. The formed closure keeps the end tidy and helps reduce moisture exposure at the wall head.

Colour Matched Architectural Projects

Where the coping finish needs to match windows, doors, fascia or rainwater goods, the stopend should be ordered in the same RAL colour as the main run. For added trust, link buyers to the aluminium coping case study so they can see how complete coping details support finished UK projects.

Frequently Asked Questions

Which end needs a left handed stopend?

A left handed stopend is used where the left end of the sloped coping run finishes exposed and needs a formed closure. The best way to confirm handing is to agree the fitting direction from the drawing and check which end of the run receives the closed face.

How many stopends are needed for a straight parapet run?

Most straight parapet runs with two open ends need two handed stopends, one for each end. One end is usually left handed and the other is usually right handed, so both should be checked before ordering.

Why choose the 125mm external leg version?

The 125mm external leg gives deeper cover down the outside wall face. It is useful on wider parapets, rendered walls, insulated build ups and projects where the external line needs a stronger finish than the 100mm option.

Can an open coping end be sealed without a stopend?

An open coping end should not rely on sealant alone. Sealant is helpful at joints, but a formed aluminium stopend gives a stronger physical closure and a cleaner long term finish at the exposed end of the coping run.

Will this match the rest of the coping system?

Yes, the stopend can be powder coated in the selected RAL colour so it matches the main coping lengths, corners and related roof edge details. Ordering the system together helps reduce colour mismatch.

Is aluminium suitable for exposed UK rooflines?

Aluminium is a strong option for UK roofline work because it is lightweight, corrosion resistant and suitable for powder coating. It performs well when specified with the correct fixings, sealant and maintenance approach for the site conditions.

Comparison Section

Formed Aluminium Left Hand Stopend

A formed aluminium left hand stopend is the strongest option for a clean sloped coping end detail. It is made to suit the system profile, can be finished in the selected RAL colour and gives the installer a neat terminal piece without improvised fabrication.

Site-Cut End with Sealant

A site-cut end may look like a quick saving, but it can leave a weaker visual and weathering detail. Sealant still has an important role at joints, but it should not be treated as the main closure at an exposed coping end.

Plastic or Generic End Cap

Plastic or generic end caps may still have a role on lower value garden or temporary applications. For visible parapets, commercial rooflines and modern extensions, a powder coated aluminium stopend gives a cleaner and more durable architectural finish.

For a full roof edge order, guide buyers back to the Aluminium Copings collection so they can choose matching lengths, corners, stopends, sealant and fasteners in one place.

Part of a Complete System

This left handed 125mm stopend should be sold as one part of a complete sloped coping system. Ordering the full system together helps avoid missed accessories, handed mistakes, colour mismatch and delays on site.

·         Aluminium Sloping Coping - use as the parent page for the matching sloped coping range.

·         Right Handed 125mm Stopend - use for the opposite end of the same 125mm external leg system.

·         90 Degree Internal Corner with 125mm External Leg - use where the wall turns inward at a right angle.

·         135 Degree Internal Corner with 125mm External Leg - use for wider inward angled parapet details.

·         Colour Coded Sealant 300ml - use where colour matched joint sealing is required.

·         Colour Coded Fasteners for Timber - use where the fixing detail is into suitable timber.

·         Colour Coded Fasteners for Metal - use where the fixing detail is into metal substrate.

·         Roof Accessories - use for wider roof edge system components and accessories.

Standards and Compliance

Parapet coping details should be designed and fitted as part of the wider flat roof and wall protection system. For flat roof design context, reference BS 6229:2025, which covers flat roofs with continuously supported flexible waterproof coverings.

For powder coating on architectural aluminium, reference BS EN 12206-1:2021, which relates to coatings prepared from thermosetting coating powder for aluminium and aluminium alloys used in architectural applications.

For new build work, the final detail should also be checked against project specifications, waterproofing supplier guidance and NHBC warranty expectations where relevant. Getting this right protects the warranty, the building and the people inside it.