3mm Aluminium Sloping Coping – 135° Internal Corner | 100mm External Leg

This 3mm aluminium coping corner is designed to create a neat 135° internal corner detail on sloping aluminium coping systems. It is suitable for angled parapet walls, flat roof edges, roofline junctions, terraces, extensions and commercial building details where two coping runs meet at an internal angle.

Made from 3mm aluminium, this coping corner provides a strong, lightweight and low-maintenance finish for UK residential and commercial projects. The 100mm external leg helps create a consistent visible edge, while the sloping profile supports rainwater run-off from exposed wall tops. The product is available in size options from 510mm to 1060mm, with RAL colour selection available before ordering.

It can be used with matching aluminium copings, rainwater goods, and other aluminium roofline products for a consistent project finish.

Key Benefits

• Creates a neat 135° internal corner where two sloping coping runs meet.

• Made from 3mm aluminium for a strong, lightweight and durable roofline detail.

• 100mm external leg helps provide a clean visible edge on parapet walls and roof edges.

• Sloping profile supports rainwater run-off and helps reduce standing water on exposed wall tops.

• RAL colour options allow the coping corner to match fascia, soffits, cladding, downpipes or other aluminium details.

• Suitable for UK residential, commercial, refurbishment and new-build projects.

• Custom-fabricated to the selected size and finish for a more project-specific result.

Product Details and Specification

Where This Product Is Commonly Used

This aluminium coping corner is commonly used by roofers, contractors, builders, architects and homeowners working on angled parapet walls, flat roof edges, roof terraces, extensions and commercial roofline details. It is especially useful where two runs of aluminium sloping coping meet at a 135° internal angle and need a clean, consistent corner finish.

For larger roofline projects, this product can be used with straight coping lengths, stop ends, fixings, sealants and related aluminium components. If the project also includes roof drainage or colour-matched exterior metalwork, it can be coordinated with rainwater goods, fascia and soffits, trims and other aluminium architectural products.

Why Aluminium Is a Good Choice

Aluminium is a practical material for coping systems because it is lightweight, strong, long-lasting and highly corrosion resistant. The Council for Aluminium in Building explains that aluminium naturally generates a protective oxide coating and accepts surface finishes such as powder coating, which makes it useful for external building products.

For UK roofline applications, these qualities make aluminium suitable for exposed parapet walls, flat roof edges and angled wall junctions. It is easier to handle on site than heavier materials, does not rust like ferrous metals, and can provide a clean architectural finish with low ongoing maintenance when installed correctly.

Finish and Colour Options

This product includes a RAL colour selection option, allowing the coping corner to match or coordinate with the wider building design. A consistent colour choice can help the coping work neatly with fascia and soffits, gutters, downpipes, cladding, flashings and other aluminium roofline details.

For general colour reference, buyers can check the official RAL colour information. RAL provides recognised colour systems and colour references, but screen colours may vary, so the final colour choice should be checked carefully before ordering.

Installation and Ordering Notes

Before ordering this 135° internal coping corner, measure the wall width, corner angle and coping run carefully. The selected size needs to work with the straight coping lengths on both sides of the corner, so check the full roofline layout before placing the order.

You may also need to consider fixings, joints, sealant, stop ends, external corners, outlets, abutments and any adjoining roof coverings. Where drainage performance is part of the wider project, UK guidance such as Approved Document H: drainage and waste disposal may be useful for general reference.

This is a custom-fabricated item made to the selected size and finish. Please check all measurements and colour details carefully before ordering, as the product page states that custom-fabricated items are non-returnable unless faulty.

Why Buy From Online Metal Store Ltd

Online Metal Store Ltd supplies aluminium architectural products for UK roofline, rainwater and construction projects. The product range includes aluminium copings, rainwater goods, fascia and soffits, accessories and aluminium door canopy products.

The company supports buyers with product dimensions, RAL colour selection, custom fabrication and order guidance. This is useful for contractors, builders, roofers and homeowners who need the right size, finish and product type before ordering for a live project.

FAQ Section

What is this aluminium coping corner used for?

This product is used to form a 135° internal corner on a sloping aluminium coping system. It is commonly used on angled parapet walls, roof edges, terraces and flat roof upstands.

What size options are available?

The product is available in size options from 510mm to 1060mm. Choose the size that matches your wall width and coping system.

Can I choose a RAL colour?

Yes. A RAL colour option is available before ordering. This can help match the coping corner with fascia, soffits, gutters, downpipes, cladding or other aluminium roofline details.

Is this product suitable for UK weather?

Yes. Aluminium is commonly used for external building products because it is lightweight, corrosion resistant and suitable for exposed applications when installed correctly.

Does the sloping profile help with rainwater run-off?

Yes. The sloping profile helps direct rainwater away from the wall top and supports better water run-off as part of a suitable coping system.

Is this product returnable?

This is a custom-fabricated item made to the selected size and finish. It is non-returnable unless faulty, so measurements and colour choices should be checked carefully before ordering.

What should I check before buying?

Check the wall width, corner angle, selected size, RAL colour, matching straight coping lengths, fixings, joints, stop ends and any wider drainage or roofline requirements.

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.