Cast iron Gutters

Should I replace cast iron guttering?

You should consider replacing cast iron guttering if it's cracked, leaking, or heavily corroded. However, cast iron is incredibly durable, so in many cases, sections can be repaired or repainted rather than fully replaced. If your gutters are beyond repair, replacing them with new cast iron will preserve the building's traditional style while ensuring long-term protection.

How long do cast iron gutters last?

With proper installation and regular maintenance, cast iron gutters can last 50 to 100 years or more. Their strength and rigidity make them one of the most durable rainwater systems available – ideal for properties where longevity and heritage aesthetics are key.

How do cast iron rainwater systems compare to modern materials like PVC?

Cast iron gutters offer a heritage look and an exceptional lifespan that PVC can't match. While PVC is lightweight and has a lower upfront cost, cast iron offers superior strength, durability, and sustainability. It's also quieter in heavy rain, more stable in extreme weather, and can be easily maintained or repainted for decades of use.

Can cast iron rainwater systems be customised or made bespoke?

Yes. Cast iron guttering can be custom-made to match existing profiles, decorative details, or heritage requirements. Whether you're restoring a listed building or replicating a traditional system, bespoke fabrication ensures a perfect visual and functional fit.

Are cast iron gutters suitable for heritage or listed buildings?

Absolutely. Cast iron guttering is the preferred choice for heritage and listed properties, as it maintains the building's authentic appearance while offering modern-day performance. Many conservation officers specify cast iron for repairs and restorations.

How many brackets are required to install a cast iron gutter system?

Brackets are typically fitted at intervals of around 900mm (3 feet), though spacing may vary depending on the gutter profile and roof layout. Additional brackets should always be installed at joints and outlets for added strength and stability.

Are cast iron gutters and downpipes environmentally friendly?

Yes – cast iron is one of the most sustainable materials available for guttering. It's made from 100% recyclable metal, has an exceptionally long lifespan, and can be refurbished rather than replaced. This makes it an eco-friendly choice for both traditional and modern buildings.

What finishes and colours are available for cast iron guttering?

Cast iron gutters are available in a choice of primer or factory-applied painted finishes. Our painted range includes black as standard, with bespoke colour options available to match your design requirements. Our Alumasc, Hargreaves, and Saint-Gobain PAM UK ranges are available in a primer finish for on-site painting or a black semi-gloss coating, with bespoke colour options available to match your design requirements.

What lengths do cast iron gutters and downpipes come in?

Standard cast iron gutters and downpipes are supplied in 1.83m (6ft) lengths. This traditional sizing ensures straightforward handling and installation, while maintaining authentic details for period-style properties.

Can I use a standard silicone to joint cast iron RW gutters?

No, standard silicone isn't suitable for cast iron gutter joints. You should use a specialist low-modulus silicone sealant designed specifically for metal guttering, which provides flexibility and weather resistance without damaging the paint finish.

Can the cast iron RW gutters be installed level?

No – cast iron gutters should always be installed with a slight fall (around 1:600) to ensure efficient water flow towards outlets. Installing them level may cause standing water and increase the risk of corrosion over time.

How do I seal cast iron gutter joints?

To create a watertight joint, apply a low-modulus silicone sealant between the gutter sections, then secure them using nuts, bolts, and washers. We also supply complete jointing packs with everything you need for a clean, secure, and professional installation.

How are cast iron gutters installed?

Cast iron gutters are installed using robust fascia or rise-and-fall brackets, which are secured to the building's structure. Each section is bolted together and sealed at the joints, with outlets, stop ends, and downpipes connected to complete the system. Due to the weight of cast iron, professional installation is often recommended.

Do cast iron gutters need painting?

Yes, cast iron gutters should be painted to protect against corrosion. If supplied in a primed finish, they must be painted after installation. Alternatively, you can opt for a pre-painted or powder-coated finish for added convenience and a longer-lasting protective layer.

How often should cast iron gutters be maintained?

We recommend cleaning and inspecting cast iron gutters at least once a year. Remove leaves and debris, check for chips or rust, and touch up any exposed metal to maintain the protective coating. Regular care can extend the lifespan well beyond a century.

Why do I need to opt for a painted finish instead of a primed finish?

A painted finish provides full protection against moisture, corrosion, and weathering, whereas a primed finish is only a base coat that requires painting before installation. If left unpainted, primed cast iron will begin to rust. Opting for a painted or powder-coated finish saves time and ensures lasting durability.

What should I do if I have to cut the cast iron RW gutters or downpipes? Will it jeopardise the powder coating finish?

If you need to cut cast iron, always re-prime and paint the cut ends before installation to prevent rust from forming. Cutting won't damage the rest of the powder coating, but any exposed metal must be sealed to maintain the integrity of the protective finish.

What accessories are needed for cast iron guttering?

Typical accessories include brackets, stop ends, outlets, shoes, bends, hopper heads, and fixing bolts. We also supply jointing kits with all the necessary nuts, bolts, washers, and sealant to make installation straightforward.

What profiles are available for cast iron guttering?

Our cast iron guttering is available in a range of traditional profiles, including:

Half-round – classic and versatile, suitable for most property styles.

Ogee (Victorian) – decorative with a distinctive curved front for period properties.

Box gutter – deep capacity for larger roofs or commercial buildings.

Each profile can be supplied with matching fittings and accessories for a complete system.