1mm Aluminium Soffit – Internal Joiner | Type 1

Join soffit sections cleanly at internal corners with a durable aluminium connector designed for a smooth finish.

The 1mm Aluminium Soffit – Internal Joiner (Type 1) is used to securely connect two soffit boards at an internal corner, maintaining both strength and a visually neat finish. Designed to match Type 1 soffit systems, this joiner provides alignment and support while maintaining airflow where required. Made from lightweight yet durable aluminium, it's finished with a powder-coated layer for resistance to corrosion, UV, and weathering. Ideal for both new installations and replacement work on domestic or commercial projects.

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

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Size

Starting at £5.70

excluding shipping cost

Download Colour Chart

Features + Benefits

Internal joiner for Type 1 aluminium soffit boards
1mm aluminium for lightweight strength
Provides clean corner alignment and a seamless look
Powder-coated for external weather resistance
Helps maintain airflow and structural stability
Fire-rated A2-s1,d0, suitable for UK building standards
Simple push-fit installation
Matches full Online Metal Store soffit range
Available in RAL and BS colour options
Recyclable and UK-manufactured

Specs & Options

Type: Internal Joiner – Type 1 Soffit
Material: 1050A Grade Aluminium
Thickness: 1mm
Finish: Polyester powder-coated
Fire Rating: A2-s1,d0
Colours: Full RAL and BS range
Fixings: Clip-fit design, no visible screws
Lead Time: 3 to 5 working days
Custom Sizes: Available on request

Installation / Usage Instructions

Slide the joiner over the edge of each soffit board where they meet at a corner. Ensure the boards are aligned and fitted over a solid base. Leave a 3mm expansion gap where required. Use EPDM tape if additional sealing is needed.

Need a simple, secure way to connect soffit corners?

This 1mm aluminium internal joiner for Type 1 systems offers clean results and long-term protection. Order today or contact the Online Metal Store team for colour matching or layout support.