Aluminium Box Gutter – 90° Internal Corner

Control corner water flow with a strong, leak-resistant gutter bend that keeps your roof edges protected and clean.

The Aluminium Box Gutter – 90° Internal Corner is designed to create a smooth, watertight transition at internal roof angles. This high-grade aluminium fitting prevents water buildup at gutter corners and supports seamless drainage through tight junctions. Whether you're working on a new construction or updating an existing roof, this pre-formed internal corner ensures easy alignment, leak prevention, and long-term performance. It's built to match our full box gutter system, with the strength and style your project needs.

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

£42.60

excluding shipping cost

Download Colour Chart

Features + Benefits

Seamlessly connects internal gutter angles at 90 degrees
Helps prevent water stagnation, overflow, and leakage
Fabricated from strong, corrosion-resistant aluminium
Powder-coated for long-term durability in any climate
Matches 100mm, 125mm, and 150mm box gutter systems
Fire-rated A2-s1,d0 for compliance with UK building regulations
Ideal for both residential and commercial roofs
Lightweight and easy to install
Fully recyclable and low-maintenance
Manufactured in the UK by Online Metal Store

Specs & Options

Material: 1050A Grade Aluminium
Finish: Polyester powder-coated (RAL/BS colour options)
Fire Rating: A2-s1,d0
Lead Time: 3 to 5 working days
Use Case: Internal corner fitting for box gutter systems

Installation / Usage Instructions

Fit the corner into position between two box gutter runs meeting at a 90° internal angle. Use gutter sealant and compatible fixings to secure a watertight connection. Ensure brackets are evenly spaced around the corner to support weight and maintain flow.

Need a clean corner solution for your gutter layout?