1mm Aluminium Soffit Internal Joiner - Type 1 for Seamless Finish

The 1mm Aluminium Soffit Internal Joiner - Type 1 is designed to create a clean joint between soffit sections, helping the finished roofline look neat, continuous, and professionally detailed. It is a useful component for residential, commercial, refurbishment, and new build projects where aluminium soffit boards need to be joined without leaving an untidy gap.

This product is made from 1mm aluminium and is available in size options from 150mm through to 800mm. The current product page lists the price from £4.75 excluding VAT and £5.70 including VAT, with a RAL colour selection available before ordering. The page also states that this is a custom-fabricated item made to the selected size and finish, so measurements and colour choice should be checked carefully before purchase.

For a complete roofline installation, this joiner can be planned with 2mm Aluminium Soffit Type 1, 2mm Aluminium Soffit 90° Corner, Fascia & Soffits, colour coded fasteners, colour coded sealant, and other aluminium roofline accessories.

Key Benefits

• Helps create a clean internal joint between aluminium soffit sections.

• Made from 1mm aluminium, giving a lightweight and practical roofline joining detail.

• Available in size options from 150mm to 800mm to suit different soffit widths and project requirements.

• RAL colour selection helps the joiner coordinate with soffit boards, fascia, copings, gutters, downpipes, cladding, doors, and windows.

• Aluminium offers corrosion resistance and low maintenance, making it suitable for external UK roofline applications.

• Works naturally with 2mm Aluminium Soffit Type 1, 2mm Aluminium Soffit 90° Corner, and matching colour coded accessories.

• Helps improve the final appearance of soffit installations by reducing visible gaps between sections.

Product Details and Specification

These details are based on the current Online Metal Store Ltd product page, which lists the product title, 1mm aluminium material, price, size options, RAL colour field, product features, and custom-fabricated item notice.

Where This Product Is Commonly Used

This aluminium soffit internal joiner is commonly used on house extensions, new build homes, roofline refurbishments, commercial buildings, office units, schools, garden rooms, outbuildings, and modern exterior upgrades. It is especially useful where two soffit sections meet and the installer needs a cleaner joint detail rather than leaving an exposed or uneven join.

For wider roofline planning, buyers can browse the full Fascia & Soffits range. This product also sits naturally alongside Aluminium Copings, Rainwater Goods, and other roofline accessories.

Why Aluminium Is a Good Choice

Aluminium is a practical material for soffit joiners because it is lightweight, corrosion resistant, and suitable for external architectural details. It is easier to handle than many heavier materials and works well where a clean, colour-matched roofline finish is required.

The product page describes the joiner as high-quality aluminium, corrosion resistant, lightweight, and suitable for residential and commercial soffit projects. Aluminium is also widely recognised as a durable and recyclable material, and The Aluminum Association describes aluminium as lightweight, strong, durable, and infinitely recyclable.

Finish and RAL Colour Options

This product includes a RAL colour option, allowing the soffit joiner to match or coordinate with the rest of the building exterior. This is useful when the same finish is required across soffit boards, fascia, aluminium copings, rainwater goods, cladding, trims, doors, windows, or other visible architectural metalwork.

The official RAL Colours page lists colour ranges including RAL Classic, RAL Effect, RAL Design System plus, RAL Individual, and RAL Digital. For architectural aluminium finishes, QUALICOAT UK & Ireland explains that QUALICOAT is focused on maintaining and promoting powder coating quality on aluminium and aluminium alloys for architectural applications.

Ventilation and Roofline Notes

Soffit joiners should be considered as part of the wider soffit and roofline system. If the soffit area contributes to roof ventilation, buyers should confirm whether the project needs ventilated soffits, non-ventilated soffits, continuous ventilation strips, or another ventilation detail before ordering.

GOV.UK states that Approved Document F covers building regulation guidance for ventilation requirements in England, including guidance for dwellings and buildings other than dwellings. For roofing work, the joiner should be selected and installed in a way that remains compatible with the project’s roof construction, ventilation design, and moisture control requirements.

Installation and Ordering Notes

Before ordering, confirm the required joiner size, soffit width, soffit type, fixing surface, joint position, ventilation requirement, colour choice, and any sealing or accessory requirements. The product page lists size options from 150mm to 800mm, so the selected size should match the soffit board width and project detail.

This product is custom fabricated to the selected size and finish. The product page states that buyers should double-check measurements before ordering and that the product is non-returnable unless faulty.

If the installation also needs matching accessories, consider Colour Coded Fastener Timber Pack of 25, Colour Coded Metal Fasteners - Pack of 25, and Colour Coded Sealant - 300ml.

Why Buy From Online Metal Store Ltd

Online Metal Store Ltd supplies aluminium architectural products for UK homeowners, installers, builders, construction professionals, roofers, contractors, property developers, and commercial project teams. Its main product categories include aluminium copings, rainwater goods, fascia and soffits, metal planters, door canopy and window products, and accessories.

This product is useful for buyers who need a made-to-order aluminium soffit internal joiner in a selected size and RAL colour. Ordering matching roofline components from the same supplier can help keep soffits, fascia, corners, joiners, copings, fasteners, sealants, and rainwater goods more visually consistent across the project.

If you are unsure about size, colour, fixing method, ventilation, or compatibility with your soffit detail, use the Contact Us page before placing your order.

FAQ Section

What is a 1mm aluminium soffit internal joiner used for?

It is used to join two aluminium soffit sections together, helping create a cleaner and more seamless roofline finish.

What sizes are available?

The product page lists 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, and 800mm size options.

Can I choose a RAL colour?

Yes. The product page includes a RAL colour option, allowing the joiner to coordinate with matching soffit boards, fascia, copings, gutters, downpipes, cladding, doors, or windows.

Is this product suitable for commercial buildings?

Yes. The product page describes the joiner as suitable for residential and commercial applications, including homes, remodels, retail spaces, offices, and other building projects.

Does this joiner provide ventilation?

Ventilation details should be confirmed before ordering. Some roof designs need specific ventilation provision, so check the project requirement before selecting soffit components.

What other products may I need?

Depending on the project, you may need 2mm Aluminium Soffit Type 1, 2mm Aluminium Soffit 90° Corner, fascia boards, colour coded fasteners, colour coded sealant, aluminium copings, rainwater goods, trims, and compatible fixings.

Is this product returnable?

The product page states that this is a custom-fabricated item made to the selected size and finish, and it is non-returnable unless faulty.

Choose the correct size and RAL colour for your 1mm aluminium soffit internal joiner before ordering. If you are unsure about measurements, soffit compatibility, ventilation, fixing method, or colour matching, contact Online Metal Store Ltd for guidance before purchase.