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Cast Iron Rainwater System Specifications and Paint Finishes

  • October 11, 2022
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No other material offers the aesthetic appeal of cast iron, one which can satisfy all the requirements of traditional architecture.  It is the logical choice for listed properties, conservation areas, and heritage work.

The Heritage Rainwater System from Tuscan Foundry is specified and supplied throughout the UK, Ireland, and for many overseas projects.

Cast Iron Gutter Specifications – Conform to BS460

Tuscan Foundry Heritage standard rainwater range includes 8 cast iron gutter profiles in several sizes with a flow rate capacity of up to 3 liters per second.

The eight standard gutters profiles will satisfy the requirements of most project installations, but where something larger, more unique, in keeping or to satisfy the building listed status we can also supply an extensive range of large sand-cast gutters and can replicate (from originals) bespoke gutter.

In addition to our range of cast iron gutter profiles, we can also offer radius curved gutters in any of the standard profiles.

Bespoke sand cast iron gutter

Cast Iron Downpipe Specifications – Conform to BS460

Heritage cast iron round rainwater pipes are available in four diameters; 65mm, 75mm, 100mm, and 150mm, and in standard lengths of; 610mm, 914mm, 1219m, and 1.829mm and supplied either eared (with fixing lugs) or plain sockets (without fixing lugs.  Heritage cast iron rainwater pipes offer uniformity of shape and thickness, but retain the cast finish, by centrifugal casting.

The Heritage range of cast iron gutters and pipes is further enhanced by a wide selection of standard and ornamental rainwater heads.

Customisation of rainwater pipes, enable us to add ears to any standard rainwater fitting, and rainwater heads can be customised with dates or embellishments.

Standard - Cast Iron Rainwater System Specifications

  • Cast iron rainwater and gutter systems – conforming to BS460.
  • Cast iron rainwater and gutter systems – manufactured under BS EN ISO 9001:2000.
  • The gutter system should be jointed using a mechanical gutter clip.
  • Cast iron rainwater and gutter systems shall be supplied to the site protected with a grey. primer coating, ready for on-site painting, or with a factory-applied top coat.
  • Minimum Paint Requirements: * A 4-coat system, ie. 1 primer, 1 undercoat, and 2 gloss coats, (or 2 undercoats and 1 gloss coat) giving a minimum coating of 90 microns. Alternatively, Heritage Extra factory applied to coat giving a greater thickness as well as more consistent finish could be used.
  • Coastal and marine areas: Where the building is situated within five miles of the sea, a proprietary marine paint finish would be advised. Please contact us for further information.
  • Final coatings should be applied before installation by the installer.
  • Where the pipe is required to be projected from the wall, cast iron wall spacer plates shall be used.
  • Where pipes and gutters are cut on site, the ends shall be cut clean and square with burrs removed. All cut ends shall be made good/re-coated with primer and top coat system.

Key Benefits of Cast Iron Rainwater Systems

Cast iron offers many advantages over more modern materials and has been recognised and used consistently on buildings for well over two hundred years now, after replacing lead which was used on larger and more important buildings.

The many benefits of cast iron rainwater systems include:

  • Cast iron rainwater pipes are highly resistant to distortion caused by accidents or vandalism.
  • Cast Iron gutters can withstand the weight of ladders for roof maintenance. In addition, cast iron gutters will not bend and sag when subjected to heavy snow and storms.
  • Correctly installed and maintained cast iron rainwater systems can last more than 100 years. This long life expectancy makes cast iron the cost-effective choice with whole life costs around a third of plastic rainwater goods.
  • Cast iron rainwater systems are 100% recyclable at the end of their life, meaning that they can be melted down and reused time and time again. No other rainwater system can offer the environmental benefits that cast iron gutters and pipes can provide your project.
  • Low noise levels due to the sound deadening properties of cast iron so very little expansion and contraction in extreme temperatures therefore no noisy clicking, creaking, or permanent deformation of gutters.

Cast Iron Rainwater Coatings and Paint Systems

Cast iron gutter and pipe - paint finishes

Our rainwater systems are available in four paint finishes and factory finish solutions will enable quicker on-site installation:

  • Heritage Grey Primed: Anti-corrosive high-build primer.
  • Heritage Extra Black Gloss: 2-part Polyurethane High Solids Finish.
  • Heritage Extra RAL Coloured: 2-part Polyurethane High Solids Finish.
  • Heritage Coastal: Marine Paint Finish

Our factory-applied 2-part polyurethane finish has a life expectancy of 10 years. This is subject to an annual maintenance schedule and the correct installation procedures being followed, especially as far as cutting and retouching are concerned.

Heritage Coastal is designed to perform in the rigors of a marine environment. The standard 10-year life expectancy does not apply to coastal and marine environments and we recommend any location within 5Km of the sea should choose our Coastal finish.

For further details on specifications relating to cast iron rainwater systems, gutters, and pipes, please contact our sales office.

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Why Cast Iron Guttering Is Ideal for Period and Listed Properties

Cast iron offers an authentic appearance that complements traditional architecture. It’s also robust, long-lasting, and often required to meet listed building consent conditions. Unlike plastic alternatives, cast iron guttering retains the historic integrity of a building and weathers beautifully over time.

It’s also worth noting that modern cast iron systems benefit from factory-applied protective coatings, making them easier to maintain and install than in decades past. Cast iron offers seamless integration into any historic elevation when matched carefully to the existing system or surrounding details.

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Find out more about our products by giving us a call
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