Aluminium Roof Soakers – 25 Pack

If you have ever had to strip a roof and deal with corroded lead soakers that have stained the brickwork and left the abutment leaking, you already know the frustration. Lead is heavy, expensive and increasingly a target for thieves. On top of that, it is a nightmare to price into a job when costs keep climbing.

Our aluminium roof soakers solve all of that. They go in the same way, do the same job, and they will not corrode, stain or get nicked off the roof overnight. Whether you are a roofer working across Essex, a builder running a project in London or a homeowner sorting out a dodgy chimney abutment yourself, these soakers give you a proper, lasting result without the hassle or the price tag of lead.

Product Overview

Aluminium roof soakers are pre-formed metal flashings that sit between successive courses of roof tiles or slates where a pitched roof meets a vertical surface. That vertical surface might be a party wall, a side return wall on an extension, or a chimney stack. The soaker works alongside a cover flashing to form a fully watertight joint, guiding rainwater away from the wall and preventing damp or water penetration into the building fabric.

We supply these soakers in packs of 25, which is the standard trade quantity and more than enough for a typical domestic abutment run. Each soaker is manufactured from 0.5mm thick, high-grade 1050A aluminium right here at our factory in Chelmsford, Essex. We hold stock across a wide range of sizes to suit plain tiles, standard slates and large-format slates. If the job calls for a colour match, we can powder coat every soaker to any RAL colour you need. For a fully coordinated finish on the fixings side, pair them with our colour coded fasteners.

Online Metal Store Ltd has been supplying roofers, builders and homeowners across the UK with aluminium roofing products for years. We understand what works on British roofs because we manufacture and test everything locally, in the same climate our customers are building in.

Key Benefits

Lightweight and practical

Aluminium is a fraction of the weight of lead. That matters when you are carrying materials up a ladder and working at height all day. It also means less structural load on the roofline itself, which is worth considering on older properties where timbers may not be in the best shape.

Built for British weather

We get everything here in the South East. Driving rain, frost, coastal winds if you are further out towards Southend or the North Essex coast. Aluminium handles all of it without corroding. Unlike lead, it will not degrade in acidic rainwater or develop that chalky surface that causes run-off stains on brickwork and render.

Powder coating in any RAL colour

Not every job needs a mill finish soaker. On commercial builds, conservation projects or even a nice residential extension where the abutment is visible from the street, you can specify any RAL colour to match the surrounding roofline products. It is a small detail that makes a big difference to the finished look.

Genuine value for trade buyers

At the price point we offer, a 25-pack of aluminium soakers costs significantly less than the equivalent in lead. That saving adds up quickly across multiple jobs. For contractors pricing re-roofs or extension work, it makes the estimate more competitive without cutting corners on quality.

Fully recyclable

Aluminium is 100% recyclable with no loss of performance. For builders and developers working to sustainability targets or BREEAM requirements, that is a genuine tick in the box rather than just a marketing line.

Made in Chelmsford, shipped nationwide

We manufacture these soakers at our facility on Southend Road in Chelmsford. Orders are dispatched quickly across the UK. If you are local to Essex, you are welcome to collect. If you are in Scotland, Wales or anywhere in between, we will get them to you.

Technical Specifications

Material: High-grade aluminium (1050A grade)

Thickness: 0.5mm

Pack Quantity: 25 soakers per pack

Available Lengths: 150mm, 175mm, 225mm, 300mm, 325mm, 337mm, 350mm

Width Options: 100mm x 50mm, 100mm x 75mm, 75mm x 75mm

Pre-formed Angle: 90 degrees

Finish Options: Mill finish as standard, or powder coated to any RAL colour

Suitable For: Plain tiles, interlocking tiles, natural and man-made slates

Manufactured In: Chelmsford, Essex, United Kingdom

Custom Fabrication: Yes. This is a custom-fabricated item made to your selected size and finish. Non-returnable unless faulty.

Choosing the Right Size

Picking the right soaker size is straightforward once you know what roof covering you are working with. Here is a quick guide:

• 150mm length soakers are the standard choice for plain tiles with a short gauge. These are the most common on traditional domestic roofs across Essex and the Home Counties.

• 225mm to 300mm length soakers suit standard format slates, typically 500mm x 250mm. You will find these on a lot of Victorian and Edwardian terraces across London and the South East.

• 325mm to 350mm length soakers are designed for large format slates at 600mm x 300mm, as well as deeper gauge applications. Common on newer builds and commercial projects.

The width dimension refers to the two legs of the soaker once it is bent to 90 degrees. One leg sits flat on the roof slope beneath the tile course. The other turns up against the wall face. A 100mm x 75mm configuration gives you good coverage for most standard applications. If you are unsure, measure your tile headlap and the depth of your wall detail, then get in touch and we will confirm the right specification.

Where Aluminium Roof Soakers Are Used

House extensions and new builds

This is probably the most common application we see. A homeowner in Chelmsford, Colchester or Brentwood extends their kitchen out the back, and the new pitched roof meets the existing side wall of the house. Aluminium soakers sit beneath each tile course along that abutment, forming the primary line of defence against water getting in. It is a detail that needs to be right, because if water gets past the soakers, it is straight into the wall cavity. For the roof edge, pair the soakers with an aluminium drip trim to finish the job properly.

Re-roofing and lead replacement

We get a lot of enquiries from roofers stripping old roofs and finding lead soakers that have seen better days. Sometimes they have corroded, sometimes they have been stolen. Either way, aluminium soakers drop straight in as a direct replacement. They are lighter, cheaper and you do not need to worry about them walking off the roof. Where the abutment also needs a longer cover flashing, our aluminium roof flashing in 2500mm lengths works alongside the soakers to give you a complete weathertight detail.

Commercial and contract roofing

On bigger commercial jobs, whether that is a school in Basildon, a care home in Cambridge or a housing development in Thurrock, specifying powder-coated aluminium soakers in a matching RAL colour gives you a clean, uniform finish across long abutment runs. The 25-pack format makes ordering and estimating simple. Have a look at our full range of trims, flashings and angles to build out the complete specification for the project.

Chimney abutment repairs

Chimney abutments are one of the most common sources of water ingress on UK homes. The soakers fail, the pointing cracks, and before long you have got damp patches on the bedroom ceiling. Replacing old soakers with new aluminium ones is a quick, permanent fix that does not cost the earth. If the property also has a valley where two roof slopes meet, our aluminium valley tray handles the water run-off on that detail.

Frequently Asked Questions

What are aluminium roof soakers used for?

Aluminium roof soakers waterproof the junction where a pitched roof meets a vertical surface such as a wall or chimney. They sit between each course of tiles or slates and work with a cover flashing to stop rainwater from getting into the building. They are a lightweight, corrosion-resistant alternative to traditional lead soakers and are used on both domestic and commercial roofing projects across the UK.

Are aluminium soakers better than lead soakers?

For the vast majority of roofing projects in the UK, yes. Aluminium soakers are much lighter, fully resistant to corrosion, and they do not stain brickwork the way lead can over time. They are also far less attractive to thieves, which has become a real issue on building sites and occupied properties alike. Lead still has its place on heritage or listed buildings where the conservation officer requires traditional materials, but for everything else, aluminium is the practical, cost-effective choice.

What size aluminium soakers do I need for plain tiles?

For standard plain tiles, a 150mm length soaker with a width of 100mm x 50mm or 100mm x 75mm is usually right. The exact size depends on your tile gauge and headlap, so always check the tile manufacturer's recommendations before you order. If you are not sure, drop us a message with your tile type and we will confirm the correct specification.

Can aluminium roof soakers be powder coated?

Yes. We offer powder coating in any RAL colour. This is especially useful on commercial projects or visible residential abutments where you want the soakers to blend in with the rest of the roofline. Just select your RAL colour when you place the order and we will fabricate them to match.

How do you fit aluminium roof soakers?

Each soaker is placed between successive courses of tiles or slates as the roof is laid. One leg sits flat on the roof slope beneath the tile, and the other leg turns up against the wall face. A cover flashing is then dressed over the upstand to complete the waterproof detail. The soakers come pre-bent to 90 degrees, so there is no additional forming needed on site. It is a straightforward process for any competent roofer or experienced DIYer.

Do aluminium soakers work with slate roofs?

Absolutely. Aluminium soakers are suitable for both natural and man-made slates. You will just need a longer soaker to match the slate size and gauge. Our 225mm to 350mm length options cover all standard and large-format slates. The installation method is identical to tiled roofs.

Aluminium vs Lead vs Plastic: Which Soaker Should You Use?

Aluminium soakers

Very light, easy to carry up a ladder and quick to fit. Excellent corrosion resistance with a lifespan well beyond 25 years in normal UK conditions. Available in any RAL colour through powder coating. Virtually no theft risk. No brickwork staining. Fully recyclable. Low cost per pack. Compliant with current UK building regulations for both domestic and commercial work.

Lead soakers

Noticeably heavier, which adds up across a full abutment run. Good long-term durability in the right conditions, potentially 40 years or more, but lead degrades faster in acidic environments and near certain hardwoods. Only available in grey. High theft risk, which is a genuine problem on sites across London, the South East and beyond. Can leave unsightly staining on brickwork and render. Higher cost per unit, and that gap has widened in recent years. Still specified on listed buildings and conservation area projects where the local authority requires traditional materials.

Plastic soakers

Very light and cheap upfront, but that is where the advantages end for most jobs. Expected lifespan is around 10 to 15 years, roughly half that of aluminium. Limited colour options. No theft risk. No brickwork staining. Poor recyclability. The lower initial cost sounds attractive until you factor in earlier replacement. Always check that plastic soakers meet the specification required under current UK building regulations for your project type, as not all products are suitable for all applications.

For the vast majority of roofing work in the UK, aluminium soakers hit the right balance of performance, cost and longevity. Browse the full range of roof accessories from Online Metal Store Ltd to find everything you need for the job.

Standards and Compliance

Aluminium roof soakers should be installed in line with BS 5534:2014+A2:2018, the British Standard for slating and tiling. This standard sets out requirements for soaker sizing, material suitability and correct installation at abutments. If you are working on a new-build project that needs NHBC warranty sign-off, the NHBC Standards Chapter 7.2 on pitched roofs provides additional guidance on acceptable flashing and soaker details. Following these standards is not just good practice. It protects you, your client and the building.