3mm Aluminium Sloping Coping – 90° Internal Corner | 100mm External Leg

This 3mm aluminium coping corner is designed for creating a neat 90° internal corner detail on sloping coping systems. It is suitable for parapet walls, roof edges, flat roof upstands and architectural roofline projects where two coping runs meet at an internal angle.

Made from 3mm aluminium, this coping corner provides a strong, clean and low-maintenance finish for UK residential and commercial projects. The 100mm external leg helps create a consistent edge detail, while the sloping profile supports water run-off from exposed wall tops. It works well alongside matching aluminium sloping copings, aluminium coping systems, and related roofline products.

The product is available in multiple size options from 510mm to 1060mm, with RAL colour selection available to suit surrounding fascia and soffits, cladding, downpipes or rainwater goods. For colour planning, you can also check the official RAL colour information before confirming the finish.

Where This Product Is Commonly Used

This aluminium coping corner is commonly used by roofers, builders, contractors, installers and homeowners working on flat roof edges, parapet walls, extensions, renovations and commercial roofline details. It is especially useful where two sloping aluminium coping runs meet at a 90° internal angle and a clean corner finish is required.

For larger projects, it can be used alongside matching straight coping lengths, stop ends, external corners, fixings and sealants. If the project also includes drainage upgrades, the finish can be coordinated with aluminium gutters and downpipes from the rainwater goods range.

Why Aluminium Is a Good Choice

Aluminium is a practical material for coping systems because it is lightweight, corrosion resistant and suitable for exposed roofline areas. The Council for Aluminium in Building explains that aluminium naturally forms a protective oxide coating and is highly corrosion resistant, which makes it useful for products where protection and conservation are important.

This makes aluminium a strong fit for UK parapet walls, flat roof edges and exposed building details. It does not rust like some ferrous metals, requires low maintenance when installed correctly, and can be finished in a wide range of colours. For buyers comparing roofline materials, aluminium offers a clean balance of durability, manageable weight and modern appearance.

Finish and Colour Options

This product includes a RAL colour selection option, allowing the coping corner to match or coordinate with other aluminium roofline products. A matching finish can be useful when the project includes fascia and soffits, aluminium copings, cladding, downpipes, trims or architectural metalwork.

For best visual consistency, use the same RAL colour across the full coping system where possible. Buyers can refer to the official RAL colour page for general colour reference, but final colour selection should still be confirmed before ordering because screen colours may not always match the finished product exactly.

Installation and Ordering Notes

Before ordering, measure the wall width and corner detail carefully to make sure the selected size is suitable. Internal corners need to work correctly with the straight coping lengths on both sides, so check the full run, joint positions and any adjoining stop ends before placing the order.

You may also need to consider fixings, joints, sealing method, outlets, abutments, external corners and any other accessories required for the wider coping system. Where roof drainage is part of the project, buyers should also consider relevant UK drainage guidance, including Approved Document H.

If you are unsure about sizing, colour matching, accessories or compatibility, contact Online Metal Store Ltd before placing the order.

Why Buy From Online Metal Store Ltd

Online Metal Store Ltd supplies aluminium architectural products for UK homeowners, installers, builders, roofers and construction professionals. The company offers aluminium coping systems, fascia and soffits, rainwater goods, trims, flashings and bespoke aluminium items for different project needs.

The business supports customers with product dimensions, RAL colour selection, custom fabrication and order handling. Products are prepared with a focus on accurate cutting, neat finishing, coating quality and secure packaging, helping buyers receive a consistent product for their project.

FAQs

What is this aluminium coping corner used for?

It is used to form a 90° internal corner on a sloping aluminium coping system, usually on parapet walls, roof edges and flat roof upstands.

Can I use this with other aluminium coping products?

Yes. It is designed to work as part of an aluminium coping system. You can view the wider aluminium copings range to match straight lengths, stop ends and other corner details.

Can I choose a RAL colour?

Yes. A RAL colour option is available. You can use the official RAL colours page as a general reference before confirming your preferred finish.

Is aluminium suitable for UK weather?

Yes. Aluminium is widely used for external building products because it is lightweight, corrosion resistant and low maintenance. The Council for Aluminium in Building provides more information about the benefits of aluminium.

Should I check drainage before ordering?

Yes. The sloping profile helps support water run-off, but the full roofline and rainwater design should be checked as part of the wider project. For drainage-related planning, you can review UK Approved Document H.

What should I check before buying?

Check the wall width, internal corner angle, coping size, RAL colour, required joints, fixings, stop ends and compatibility with the rest of the roofline system. For project support, use the Online Metal Store contact page.

Choose the required size and RAL colour before ordering. If you are unsure about measurements, finish options or matching components, contact Online Metal Store Ltd for guidance before placing your order.