Cast Iron Gutter - Half Round

Hargreaves Premier Half Round Cast Iron Gutter is manufactured using traditional methods to BS 460. Available in a choice of four sizes - 100mm115mm125mm and 150mm. Half Round Cast Iron can be ordered in either factory finished gloss black or in a grey transit primer to give protection on site prior to being painted in a colour of your choice.

Cast Iron Half Round Gutter is about as traditional as buildng materials can get in the UK. Used since victorian times, this type of gutter represents a timeless style that has endured for over a hundred years throughout all kinds of developments in building technology. Strong, durable and totally recyclable, Cast Iron is stll a widely used material in all types of applications in the UK building industry and in partcular in plumbing, heating and drainage projects. Much favoured on listed buildings, schools and churches, cast iron gutters are still a very popular choice for public and private buildings alike.


Key features are as follows:

  • The system is manufactured in the UK to BS460:1964
  • Black Painted or Grey Transit Primer Finish available
  • Minimum 40 year life expectancy when correctly installed
  • Wide choice of profiles - Half RoundBeaded Half RoundBox SectionDeepflow and three different decorative Ogee designs
  • Three standard sizes of downpipe are available to choose from: 65mm (2 1/2"),  75mm (3") and 100mm (4")
  • Superb range of Ornamental Hoppers Available.


Cast Iron is an exceptionally strong and durable material - many original installations from the Victorian era are still in existence in the UK, particularly around London and the north of England. When correctly maintained, Cast Iron Gutter will outlast all rival products that are made from other materials.

As Cast Iron is synonymous with tradition, it lends itself exceptionally well to period style properties from one-off houses to Victorian style terraces. It is also the first choice of guttering material for listed buildings, so much so that many planning officers will not accept any substitute materials. As iron is a natural material it is also totally recyclable - combine this fact with the tremendously long lifespan of this material and cast iron can rightly be viewed as a very green material.


  • All gutters and downpipes are centrifugally cast, guaranteeing totally straight lengths, an even surface finish, and consistent metal thickness throughout the gutter/pipe length.
  • Internal flow of the gutter/pipe is both efficient and unobstructed.
  • Hargreaves Foundry utilises a traditional sand moulding method, in which they have over 140 years’ experience – this gives all fittings a consistent texture free of obvious joint lines.

For more details, check out our guides and tips to see why Hargreaves guttering stands out from competitors.

Additional finishes/services are also available, including:

  • Premier extra paint finish – a high gloss, two pack PU black paint finish that eliminates the need for painting the lengths on site. These can also be painted to any RAL or BS colour to suit your requirements.
  • Premier extra coastal finish – a heavy duty version of the premier extra finish, for use in areas within approx. 5 miles of a coastline. Ensures durability of the finish & quality of the gutters.
  • Bespoke manufacture – if you’re having trouble finding a system that fits your requirements, Hargreaves Foundry also offers bespoke manufacture of products. With their own foundry and fabrication facilities onsite, they can replication any existing rainwater pipe or create a new system to fit your requirements (from drawings/samples)

To find out more about these additional services and finishes, please contact our team.


When connecting to other existing Cast Iron systems, the method of jointing on the old system needs to be checked, as some original castings had external joints and some were internal. If in any doubt, email us an image of the joint and include the sizes and we will advise you on the best way of making the joint.

Most PVC Gutter manufacturers include adaptors to half round cast iron as a standard part of their range. These adaptors usually feature a rubber seal which is compressed to make a watertight joint by tightening a PVC strap, usually with a nut and bolt assembly. Adaptors to Cast Iron Ogee are also available, these connect the metal to the PVC gutter via a nut and bolt through the actual gutter section and utilise silicon sealant to make the joint.


All Gutter Supplies Cast Iron Gutters and Downpipes are supplied in 1830mm lengths, with pre-drilled holes that allow nut, bolt and silicon fixing.

Full Installation instructions that can be easily followed on site are available to download in our guides and tips.

Alternatively if you simply wish to read more about this type of guttering prior to making a purchase we have compiled a range of articles to help you with your decision. Please click here to read ourtop tips for purchasing cast iron guttersand our article on thefeatures and benefits of cast iron gutters.

Please visit our Cast Iron Gutters Guide & Tips section for more product reviews and comparison, videos and PDF instructions.

For details on delivery and returns of this product range, please consult the delivery & returns tab below.


Alongside the most common and popular black, we also offer all of our cast iron gutter profiles in a primer coating option. This primer provides a surface to which paints can easily adhere, allowing these gutters to be coated with any colour of paint, provided that the type of paint chosen will not cause damage to the initial primer coating. There are a few other precautions that must be taken when purchasing and installing primed guttering, please see our full guide for more information.

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