Round cast iron downpipes remain the most widely used traditional rainwater pipe profile across the UK, and for good reason. The shape works naturally on almost any style of property, from listed buildings and stone cottages through to churches, farmhouses, townhouses, and larger heritage developments. Clean, balanced, and properly traditional.
At Cast Iron Warehouse, we specialise in supplying genuine Alumasc Apex Heritage round cast iron downpipes alongside matching cast iron guttering, hopper heads, offsets, shoes, brackets, and fittings for complete heritage rainwater systems. Manufactured using authentic sand cast methods and produced to BS460 standards, Apex downpipes are designed for long-term exterior performance while maintaining the character expected on traditional buildings.
Available in 65mm (2.5”), 75mm (3”), and larger 100mm (4”) round cast iron downpipe sizes, the system suits both residential and commercial drainage applications where durability and architectural detail matter. The socketed pipe design creates a far more authentic appearance than modern cast iron effect plastic systems, especially across restoration and conservation work where profile accuracy is important.
Alumasc Apex 100mm (4") Cast Iron 90 degree Bend without Ears - One of 6 CI Standard RAL Colours TBC
Sale price £63.08 Regular price £87.26Unit price
Sale price £62.31 Regular price £86.19Unit price
Sale price £63.08 Regular price £87.26Unit price
Sale price £63.08 Regular price £87.26Unit price
Sale price £108.14 Regular price £149.60Unit price
Sale price £108.14 Regular price £149.60Unit price
Sale price £108.14 Regular price £149.60Unit price
Sale price £138.68 Regular price £191.85Unit price
Sale price £172.29 Regular price £238.35Unit price
Sale price £212.84 Regular price £294.44Unit price
Sale price £235.40 Regular price £325.66Unit price
Alumasc Apex 100mm (4") Cast Iron Loose Socket with Ears - One of 6 CI Standard RAL Colours TBC
Sale price £30.14 Regular price £41.70Unit price
Sale price £30.14 Regular price £41.70Unit price
Alumasc Apex 100mm (4") Cast Iron Downpipe Eared Shoe - One of 6 CI Standard RAL Colours TBC
Sale price £84.04 Regular price £116.26Unit price
Alumasc Apex 100mm (4") Cast Iron Downpipe Shoe without Ears - One of 6 CI Standard RAL Colours TBC
Sale price £84.04 Regular price £116.26Unit price
Sale price £177.81 Regular price £245.98Unit price
Cast Iron Rainwater Frequently Asked Questions
How Quick Is Delivery?
How Quick Is Delivery?
Popular painted black cast iron guttering sizes are typically available for next working day delivery across the UK when ordered before 11:30am, subject to stock availability.
Primed systems are stocked across selected sizes, while custom RAL powder coated cast iron guttering is usually supplied within 7–10 working days.
What Makes Apex Heritage Different From Cheaper Cast Iron Systems?
What Makes Apex Heritage Different From Cheaper Cast Iron Systems?
We think the consistency is noticeably better. Apex Heritage cast iron guttering is manufactured using traditional sand cast methods alongside modern quality control standards, giving cleaner alignment, more reliable fitment, and a far better painted finish compared with lower-grade imported systems.
What Size Cast Iron Guttering Do I Need?
What Size Cast Iron Guttering Do I Need?
For most standard residential properties, 115mm (4½”) Half Round cast iron guttering is the most commonly used size. Larger roofs, commercial buildings, or areas with heavier rainfall may benefit from 125mm or 150mm systems. If you're replacing existing guttering, matching the current profile and outlet size is usually the safest option.
Is Cast Iron Better Than Cast Iron Effect Plastic Guttering?
Is Cast Iron Better Than Cast Iron Effect Plastic Guttering?
They’re completely different products really. Plastic cast iron effect guttering is lighter and cheaper upfront, but genuine cast iron is significantly stronger, longer lasting, and far more authentic visually. Proper cast iron guttering can last well over 40 years and suits heritage buildings far better than imitation systems.
Are Custom Colours Available?
Are Custom Colours Available?
Yes. Custom RAL colour cast iron guttering is available for heritage and architectural projects requiring a more bespoke finish. These systems are professionally powder coated in the UK with typical lead times of 7–10 working days.
How Heavy Is Cast Iron Guttering?
How Heavy Is Cast Iron Guttering?
Cast iron guttering is substantially heavier than plastic or aluminium systems, which is part of why it lasts so long. Proper bracket spacing and secure fixing into suitable surfaces is important for long-term performance.
How Long Does Cast Iron Guttering Last?
How Long Does Cast Iron Guttering Last?
High quality cast iron guttering systems regularly achieve service lives exceeding 40 years when correctly installed and maintained. Many older cast iron systems remain in use well beyond that.
What Happens If I Order The Wrong Parts?
What Happens If I Order The Wrong Parts?
Returns are accepted within 30 days on standard stock items. Orders returned within 14 days are generally accepted without a restocking charge, while returns after 14 days may be subject to a handling fee depending on the products ordered.
Do You Offer Trade Support?
Do You Offer Trade Support?
Yes. We work closely with builders, roofing contractors, installers, architects, and developers needing specification support, bulk pricing, and reliable lead times across larger cast iron rainwater projects.