3mm Aluminium Coping – 135° External Corner | 125mm External Leg

Finish sharp corner angles with a durable coping piece designed for clean lines and lasting protection.

This 135° external corner unit is made to match seamlessly with our aluminium sloping coping system. Designed for angled parapet walls, it allows for a tight, weathertight fit at external corners. Made from strong 3mm 1050A-grade aluminium and coated with an external-grade polyester powder finish, this unit resists corrosion and wear while enhancing the look of modern builds. The 125mm external leg offers wide wall coverage and a clean profile.

Please refer to the attached RAL colour chart to view available options. At checkout, enter your chosen RAL colour in the designated box.

Choose a variant:

Size (Capping Width)

Starting at £122.88

excluding shipping cost

Download Colour Chart

Features + Benefits

Precision-fit 135° external corner piece
Made from tough 3mm aluminium for extra strength
125mm external leg for wider wall surface coverage
Fire-rated to A2-s1,d0 for full compliance
Powder-coated for long-term weather resistance
Push-click system with no visible screws
Supplied with fixing brackets for secure installation
Available in RAL and BS colours
Designed for use with our sloping coping lengths
100% recyclable, manufactured in the UK

Specs & Options

Angle: 135° External Corner
Material: 1050A Grade Aluminium
Thickness: 3mm
External Leg: 125mm
Internal Leg: 75mm
Finish: Polyester powder-coated (external grade)
Fire Rating: A2-s1,d0
Colours: Full RAL and BS options available
Fixings: Includes 1.5nr hidden brackets per corner
Lead Time: 5 to 10 working days
Custom Sizes: Available upon request

Installation / Usage Instructions

Fix the provided brackets to the top of the wall, apply EPDM seal tape, and push-fit the corner unit into place. Designed to connect with adjacent coping lengths at a 135° angle. Leave a 3mm expansion gap for best results.

Need a clean finish for angled parapet corners?