When it comes to choosing guttering, both cast iron and aluminium are great for heritage properties.
As a leading supplier of both these high end guttering materials, this Trade Warehouse help guide compares these two popular materials across key factors, helping you make an informed decision for your property.
Our expert technical team is also on hand 5 days a week to help with your questions: 0208 037 6020.
Quick Summary:
| Feature | Cast Iron Guttering | Aluminium Guttering |
|---|
| Initial Cost | Higher upfront cost | Generally lower cost, depends on specifications |
| Lifespan | 50-100 years with regular maintenance | 25-40+ years, longer with powder coating |
| Aesthetic Appeal | Traditional, suits heritage properties and conservation areas | Versatile – ideal for both modern and traditional styles |
| Maintenance | Repainting every 5-8 years, pre-painted options available | Low maintenance, powder coating resists rust |
| Installation | Heavy, requires two people | Lightweight, easier installation |
| Sustainability | 100% recyclable, often made from reclaimed iron | 100% recyclable, low energy recycling cost |
| Material Compatibility | Resistant to most materials with painted protection | Avoid plain aluminium with copper; powder coating increases compatibility |
| Ideal Applications | Heritage homes, conservation areas | Modern homes, DIY-friendly projects |
Initial Investment: Cast Iron vs Aluminium Guttering
Cast Iron Guttering
Cast iron guttering has a higher upfront cost due to its robust nature and timeless appeal. Prices start around £39.47 per 1.83m primed gutter length as of April 2024, but the investment is often justified by its long lifespan, especially when used in heritage properties.
If you’re restoring a period property or looking for traditional charm, consider the Victorian Ogee style cast iron guttering, a classic choice for a vintage aesthetic.
Aluminium Guttering
Aluminium offers a more flexible price point, depending on style and specifications. Cast aluminium gutters, for example, can cost slightly less or on par with cast iron, with prices around £61.15 per 1.83m length. Aluminium gutters are often chosen for contemporary homes, where lightweight, streamlined options like contemporary aluminium downpipes suit a sleek, modern aesthetic.
Cast aluminium gutters on a UK property. See the rise and fall brackets in use in this picture.
Longevity
Cast Iron Guttering
Cast iron is known for its incredible longevity, lasting 50-100 years with the proper maintenance. Regular repainting, usually every 5-8 years, is required to prevent corrosion and maintain its structure. For a pre-painted option that reduces maintenance, check out our cast iron guttering collection, which can simplify upkeep for homeowners.
Aluminium Guttering
Aluminium gutters generally last around 40 years in urban or rural settings and about 25 years in harsher coastal or industrial environments. Unlike cast iron, aluminium resists rust naturally and doesn’t require regular repainting. Factory-applied powder coatings can extend aluminium’s longevity, creating a resilient, colour-fast finish that stands up to the elements. For a modern, long-lasting solution, explore our aluminium guttering options.
Aesthetic Appeal and Versatility
Cast Iron
Cast iron guttering brings a classic, heritage look that suits traditional and period properties. In conservation areas, cast iron is often a requirement to maintain architectural authenticity. Conservation officers may even specify cast iron for listed buildings to preserve historical integrity. If this is the case for your property, cast iron Victorian Ogee guttering is an excellent option to consider.
Aluminium
Aluminium’s lightweight nature makes it versatile and easier to install, often favoured for both contemporary and traditional designs. Powder-coated aluminium is available in a wide array of colours, making it simple to match existing exterior elements. For a modern look that complements aluminium’s clean lines, cast aluminium hoppers are a stylish addition to any gutter system.
Above shows the different system components for cast iron guttering.
Maintenance Requirements
Cast Iron
Cast iron requires periodic maintenance, particularly repainting every 5-8 years, to keep corrosion at bay.
This upkeep can be slightly less demanding if you choose factory pre-painted cast iron, extending the repainting interval to about 10 years.
However, maintaining cast iron guttering involves regular inspections for rust and wear, especially in damp climates. For tips on working with metal guttering, see our guide on how to cut metal guttering.
Aluminium
Aluminium gutters have a powder-coated finish that does not require repainting, making them very low-maintenance.
In cases where plain, uncoated aluminium is used, a natural oxidised layer will form, adding protection without additional upkeep.
This low-maintenance quality appeals to homeowners seeking a “set it and forget it” option.
Installation Process
Cast Iron
Due to its weight, cast iron guttering requires two people to install, which can increase labour costs. Traditional installation methods, such as silicone and bolts or Hydrostrips, are often used. Cast iron’s weight and rigidity, however, contribute to its durability, making it a sturdy choice for long-term use.
Aluminium
Aluminium’s lightweight design makes it easier and faster to install, often requiring only one installer. Systems like the patented Metseal for half-round profiles streamline installation and make aluminium an excellent choice for DIY projects. For inspiration on unique applications, check out our barn guttering ideas to see how versatile aluminium can be.
Sustainability and Recyclability
Both cast iron and aluminium are fully recyclable, adding an eco-friendly edge to these materials.
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Cast Iron: Cast iron is 100% recyclable and can be made with a significant portion of reclaimed iron, which supports sustainable building practices.
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Aluminium: Aluminium is also 100% recyclable, with a lower energy cost for recycling compared to many other metals. Much of today’s aluminium products are made from reclaimed materials, making it a top choice for environmentally conscious homeowners.
For complete roofing solutions, including guttering, explore EPDM roofing, which pairs well with both cast iron and aluminium systems.
Compatibility with Other Materials
Cast Iron
Paint layers help cast iron resist corrosion from exposure to water runoff and interaction with different materials. For example, cast iron sits in a mid-range position on the galvanic scale, reducing the likelihood of galvanic corrosion when used alongside other materials.
Aluminium
Aluminium is relatively corrosion-resistant but should be used cautiously with copper roofing due to the risk of electrolytic corrosion. Powder-coated aluminium offers additional protection and is more compatible with various woods and other metals, making it a flexible choice for modern construction.
Final Thoughts on Cast Iron vs Aluminium Guttering
Choosing between cast iron and aluminium comes down to balancing budget, aesthetics, and maintenance preferences. Cast iron guttering offers a classic, durable option for period properties, while aluminium guttering provides a lightweight, versatile choice that suits modern and traditional homes alike. Both materials offer excellent durability, but aluminium’s low maintenance and easy installation make it ideal for those seeking minimal upkeep.