3mm Aluminium Flat Coping – Stopend Upstand | 75mm External Leg

The end of a coping run is often where water finds its way in. On flat roof parapets around Chelmsford, Brentwood, Basildon and East London, an open or poorly finished end can leave the wall head exposed to driving rain, frost cycles and staining down the face of the building.

This 3mm aluminium coping upstand gives the end of the run a clean, raised termination instead of relying on a cut edge and a heavy bead of sealant. It is a practical detail for wider wall tops, commercial units, schools, care homes, extensions and modern parapet designs where the finish needs to look sharp and keep water away from vulnerable edges.

Product Overview

The 3mm aluminium flat coping stopend upstand is a made to order end piece for finishing a flat coping run with a 75mm external leg. The integrated upstand helps stop wind driven rain and water overspill at the end of the coping, which makes it useful on exposed parapets and wall heads across the South East.

Online Metal Store Ltd supplies this component as part of a wider aluminium copings system manufactured from its Chelmsford, Essex base. It is designed for buyers who want a matching end detail for a 3mm coping run, with powder coating in a selected RAL colour so the upstand, corner pieces and straight lengths stay visually consistent.

For a full installation, this upstand should be ordered with the right straight coping sections, the matching 3mm aluminium flat coping corner, colour coded sealant and suitable fixings. Ordering the full system together helps the colour, profile and installation method stay consistent across the job.

Key Benefits

Raised End Protection Where the Coping Run Finishes

The built in upstand gives the end of the run a raised barrier rather than leaving a flat open edge. That matters on exposed rooflines because wind can push rain sideways across the top of the coping, especially on taller buildings, coastal sites or open developments around Essex and Kent.

3mm Aluminium for Wide Wall Tops

This product is made from 3mm aluminium, which gives it a more rigid feel than lighter accessory pieces. It suits wider coping sizes where the end detail needs to feel stable, sit neatly and match the heavier 3mm flat coping range.

Powder Coated in Any RAL Colour

The product can be powder coated to the selected RAL colour, making it easier to match dark window frames, brickwork, render, cladding or the wider coping system. On modern schemes in places like Colchester, Braintree or Central London, that colour match helps the roof edge look intentional rather than patched together.

Corrosion Resistant for UK Weather

Aluminium is a sensible choice for the UK climate because it performs well in damp conditions and does not rust like untreated steel. With the right powder coating and installation detail, it gives a low maintenance finish against rain, frost and salt laden air in exposed locations.

Cleaner Finish Than Site Made Closures

A factory made upstand gives a cleaner and more predictable result than trying to fold or seal a closure on site. It helps roofers and contractors avoid rough cut edges, excessive sealant, visible gaps and weak corners at the end of the parapet.

UK Manufactured with Fast Delivery Support

Because the product is supplied by a UK based specialist in Chelmsford, it suits roofers, builders and developers who need made to order aluminium components without long overseas lead times. That is useful when a missing end detail is holding up final snagging or handover.

Technical Specifications

Product Name: 3mm Aluminium Flat Coping - Stopend Upstand | 75mm External Leg

Material: Architectural grade aluminium

Thickness: 3mm

Profile Type: Flat coping stopend upstand

External Leg: 75mm

Available Sizes: 510mm, 535mm, 560mm, 585mm, 610mm, 635mm, 660mm, 685mm, 710mm, 735mm, 760mm, 785mm, 810mm, 835mm, 860mm, 885mm, 910mm, 935mm, 960mm, 985mm, 1010mm, 1035mm and 1060mm

Finish: Powder coated in selected RAL colour

Use: End termination for 3mm aluminium flat coping runs

Price Shown on Current Page: From £72.80 ex VAT and £87.36 inc VAT

Important Page Note: The current selector appears to show 010mm, which should be checked and corrected to 1010mm if that is the intended size.

Choosing the Right Size / Width / Thickness

The size selector should be treated as the overall coping width, not the run length. The right size depends on the finished wall width, insulation build up, waterproofing detail and the required overhang or drip edge.

·         Use the 510mm to 610mm sizes for slimmer wide parapets where a 3mm flat coping is still required but the wall head does not need the largest cover.

·         Use the 635mm to 785mm sizes for broader domestic extensions, rendered parapets and commercial walls where the waterproofing buildup needs more coverage.

·         Use the 810mm to 1060mm sizes for large flat roof perimeter details, schools, apartment blocks, care homes and wide commercial parapets.

·         Choose this 3mm product when the straight coping lengths are also 3mm, because mixing gauges can create visual and fitting differences.

·         Check the wall measurement after render, insulation and membrane details are included, not just the bare blockwork width.

How to Install / How to Fit

Start by checking the finished wall width and confirming that the selected upstand matches the 3mm flat coping system being installed. The substrate should be stable, level and ready for the fixing method specified for the project.

Dry fit the upstand before final fixing. Check that the external leg lines through with the straight coping pieces and that the raised end sits tight enough to close the run cleanly without forcing the metal out of line.

Where a seal is needed at the joint, use colour coded sealant so the joint is protected without leaving a distracting contrast line. Select colour coded timber fasteners or colour coded metal fasteners to suit the substrate and fixing detail.

If the coping upstand meets other roof edge details, check the junction with aluminium roof flashing, trims, flashings and angles or the roof accessories used on the same project. A neat termination only performs properly when the surrounding details are also sealed and aligned.

Where 3mm Aluminium Coping Upstand Is Used

Wide Commercial Parapets

This upstand is well suited to commercial units where a wider parapet needs a strong end closure. It gives the roof edge a finished appearance while helping direct water away from the wall head.

Modern Domestic Extensions

On contemporary flat roof extensions, especially around Billericay, Southend and the Home Counties, a narrow exposed edge can spoil the look of the roofline. A colour matched stopend upstand helps the coping finish cleanly against render, brick or cladding.

Schools, Care Homes and Housing Developments

For repeatable project work, matching components reduce the chance of one-off site-made details looking different from plot to plot. This product helps contractors keep roof edge details consistent across multiple elevations.

Refurbishment of Failed Parapet Details

If the original coping end has failed, lifted or started staining the wall below, replacing the detail with a formed aluminium upstand can give a more durable result than patching the end with sealant alone. The coping case study page can also support trust for higher value coping projects.

Exposed Roof Edge Junctions

Where the end of the coping run faces open weather, a raised upstand provides a clearer barrier against wind driven rain. It is especially useful where roof edges meet return walls, parapet breaks or changes in roof geometry.

Frequently Asked Questions

What is a coping stopend upstand used for?

A coping stopend upstand is used to finish the end of a coping run and help stop water being pushed over or into the exposed end of the wall. It gives the roof edge a formed closure rather than leaving a cut coping edge or relying only on sealant.

When should I choose a 75mm external leg?

Choose a 75mm external leg when the project needs a compact vertical drop on the outside face of the wall. It is useful when the design calls for a slimmer visible edge, but you still need a wide 3mm flat coping profile across the top of the parapet.

Is a raised upstand better than a closed stopend?

A raised upstand is better where the end of the run needs extra protection against water overspill or wind driven rain. A closed stopend may be enough for simpler sheltered edges, but the upstand gives a clearer barrier at vulnerable parapet ends.

How do I measure for this product?

Measure the finished wall width after render, insulation, membrane and any build up have been allowed for. Then select the coping width that gives the correct cover and overhang for the full system, not just the bare masonry size.

Can the upstand be made in the same colour as the coping?

Yes, the upstand can be powder coated in the selected RAL colour so it matches the straight coping lengths, corners and related accessories. Ordering the full system together is the best way to keep colour and finish consistent.

Do I still need sealant with a formed upstand?

Yes, sealant is normally still needed at the relevant joints, laps or abutments. The formed upstand gives the end shape, while the sealant helps protect the joint line and reduce the risk of water entry at the connection.

Comparison Section

Aluminium Stopend Upstand

The aluminium stopend upstand is the best choice when the end of the coping run needs a raised barrier and a neat factory made closure. It is especially useful on exposed parapets, modern rooflines and projects where the roof edge finish is visible from the ground.

Closed Stopend Without Upstand

A closed stopend can work well on simpler runs where the end needs closing but does not need the same raised water barrier. It may be the right option on sheltered details or where the design does not call for an upstand at the termination point.

Site Cut Sheet and Sealant

A site cut closure may be used as a temporary or budget detail, but it rarely looks as clean as a formed product. It can also rely too heavily on sealant, which increases the risk of uneven joints, movement gaps and future maintenance.

For the strongest result, match this product with the aluminium flat copings range and order all related ends, corners, fixings and sealant as one system.

Part of a Complete System

This upstand should be treated as one part of a complete aluminium coping system rather than a standalone trim. Full system ordering helps the profile, RAL colour and installation detail stay consistent across the whole roof edge.

·         Straight aluminium copings for the main parapet runs.

·         3mm aluminium flat coping corner pieces for return details.

·         Colour coded sealant for neat, protected joints.

·         Colour coded timber fasteners where the substrate calls for timber fixing.

·         Colour coded metal fasteners where the fixing point is metal.

·         Trims, flashings and angles where the coping meets other roof edge details.

·         Aluminium termination bar where waterproofing needs a secure edge restraint.

Standards and Compliance

For flat roof projects, the design and detailing should be considered alongside BS 6229:2025, which covers flat roofs with continuously supported flexible waterproof coverings. Getting the end of the coping run right helps protect the roof edge, the warranty position and the people using the building.

For powder coated aluminium used in architectural settings, BS EN 12206-1:2021 is the relevant coating standard to reference. This is especially useful when specifying colour matched aluminium components for commercial or new build work.

Where the project is a new build, school, care home or warranty controlled development, the coping, fixings, sealant and roof waterproofing detail should be checked as a complete assembly rather than treated as separate decorative items.