How to clean, repair and repaint old iron railings and gates

Original decorative metalwork needs regular care and attention to prevent it from decaying so spot the signs of wear and tear before it occurs with this practical, step-by-step guide

19th-century stone cottage with iron railings

Original iron railings and gates are prominent, precious architectural features that define the exterior space around many period buildings.

Iron is durable and, if regularly maintained, will last for years. But where paint has worn away, the exposure to water and air can quickly result in rust and decay. When iron corrodes it expands up to 10 times its original size, causing distortion and sections to be forced apart. Metal components set into stone can even cause the stone to fracture. 

Chopping back overgrown vegetation, dealing with patches of corrosion and repainting chipped and peeling paintwork will avoid trouble in the future.

Where there is damage, avoid cheap repairs. They often use inappropriate materials such as aluminium or mild steel, while poor quality welding can hasten damage. Good quality repairs by a blacksmith are expensive, so if you are the proud owner of some original metalwork, add them to your annual home maintenance check to anticipate problems before they arise.

garden gate in old wall

Keep on top of cutting back plants, as if they encroach on railings, they can slowly erode the metalwork over time

(Image: © Photograph Leigh Clapp)

Spotting metalwork problems

  • Damaged paintwork
  • Blistering, discoloured paint or pitted surfaces
  • Corrosion and failing joints
  • Damaged or missing sections
  • Moisture or dirt
  • Moss or plant growth
  • Rust staining to renders, masonry and other surfaces in contact with ironwork, including pillars and plinths
  • Cracking to masonry where ironwork is attached
  • Squeaking, binding or sagging gates

Painting old iron gates

Painting gates and railings is an important part of their maintenance, as if water gets to the metal underneath then it will rust

(Image: © Colin Leftley)

How to clean and repaint railings and gates

You will need

Scrub railings with a metal brush to remove flaky paintwork and rust, then clear moss and weeds

1. Brush off old flaking paint

Use a steel brush to get rid of all loose and old flaking layers of paint. This is important – the new paint won’t bond with the existing paint and protect the metal unless the railings are cleaned of loose rust and unsound paint. Brush away heavy algae growth and treat with a sterilising solution, then leave for 24 hours and rinse off.

2. Clear moss and weeds

Check the bottom of the railings, scrape away moss and clear away weeds. Sometimes there is a gap between the brick plinth and the bar at the bottom where debris can collect. This becomes a moisture trap encouraging corrosion as the metal never has the opportunity to dry out. Investigate and clean with the scraper.

3. Prepare metalwork for painting

Existing paintwork must be ‘keyed’ or roughened with medium grade abrasive paper to create good adhesion for the new paint. Wet and dry paper used with water prevents the paper ‘clogging’. Wet sanding is also advisable as it reduces dust. For a smooth finish rub around the edges to avoid ‘steps’ on the new paintwork.

4. Clean away grease and grime

Wearing gloves and using a clean cloth, wash the railings thoroughly with a solution of sugar soap dissolved in hot water. This will get rid of all the dirt and grime and any greasy deposits, too. Once the railings are completely clean, use a new cloth and lots of water to rinse away the dirty suds.

5. Prune nearby plants and test paint

Cut back all vegetation that comes into contact with the railings. If painting over existing paint you must ensure that the new paint is compatible. Paint a trial section and leave overnight. Hammerite can be painted directly on to the metal without a primer, but if you’re using a gloss paint, the metal must be rust-free and then protected with two coats of zinc-based primer.

6. Protect plants from paint splashes

Use some large sheets of cardboard to prop behind the railings to protect plants. Hold in place by pushing canes into the ground on alternating sides of the board.

7. Make final preparations

Fix old newspaper to brick plinths, pillars and paths using masking tape. Check the weather forecast: a warm slightly overcast day is best; don’t paint when wind or rain are predicted and avoid the months from November to February as it will be too cold and damp for the paint to cure properly.

8. Apply new coats of paint

Brush on two coats of paint, following the manufacturer’s instructions regarding the length of time between coats. The first coat can become pitted if the second is applied too soon and two thin coats are more effective than one thicker one. If you have a lot of railings you may prefer to use a spray gun.

black wrought iron gate

The finished railings, which have been given new life through cleaning and repainting

How to repair railings

Regular maintenance and repainting is the best protection against rust and deterioration. Other potential problems include the fracturing of cast iron because of impact or casting flaws, and the distortion of wrought iron. 

Where deterioration has occurred, wrought iron can be repaired by cutting out defective lengths and welding in new pieces in a similar material. Recycled wrought iron is available but there has been no new source in the UK since the 1970s. Cast iron is more easily repaired by cold stitching. Specialist firms can take moulds from cleaned originals and recast components.

Bear in mind that repairing railings is a skilled job requiring considerable craftsmanship. Contact a blacksmith who will carry out new work on a like-for-like basis.

Use undamaged pieces of cast iron to provide patterns for new castings. Contact foundries as some still hold traditional patterns in stock.

You can also search architectural salvage yards for replacement items.

Salvage yards can be a good source for original iron gates and railings, such as these from Lassco

Salvage yards can be a good source for original iron gates and railings, such as these from Lassco

(Image: © Lassco)

When to replace ironwork

Occasionally, where there is vehicle damage, for example, replacement may be the only option. New cast-iron and mild-steel equivalents can be readily obtained and, if carefully forged, mild steel is hard to distinguish from wrought iron. 

For a period-style finish, it is best to use traditional methods of assembly rather than arc welding, which is the method that’s commonly used today.

Bear in mind that many products sold as being of ‘wrought iron’ today, such as gates, are actually fabricated from standard sections of steel welded together. While perfectly serviceable, these borrow little from the genuine traditions of the blacksmith.

New railings from Heritage Cast Iron

If replacing old railings, it's important to use a company that employs traditional blacksmithing skills. This new Terrace design is by Heritage Cast Iron

(Image: © Heritage Cast Iron)

Which type of metal?

The ferrous metals – those containing iron – that are used in buildings are not always easy to tell apart, especially as they are often concealed under thick coats of paint and different metals are used in combination. For example, the decorative heads on wrought-iron railings are sometimes cast iron.

  • Wrought iron: A traditional material and relatively durable, wrought iron is easily worked while hot and has high tensile strength because of its fibrous structure.
  • Cast iron: Items are formed in moulds and, although relatively corrosion-resistant, cast iron is brittle with little tensile strength so impact tends to cause it to crack or shatter. The metal is not easy to work. Cast iron often has a slight surface roughness and visible seams or ‘flash lines’ left by the mould.
  • Steel: Used from the second half of the 19th century, steel is a versatile material that can be worked when hot or cold and is often employed today instead of wrought iron but, although strong, it has poor resistance to corrosion.

A short history of iron railings

Wrought iron began to be widely used to create highly decorative items, including gates and screens, in the 17th and 18th centuries.

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Until technological advances in the Industrial Revolution brought about the mass production of wrought and cast iron, items were made on a modest scale by local blacksmiths

Once it became more widely available, and within the means of the growing middle classes, it soon became a favoured building material for use as a decorative boundary.

Until the late 19th century, it was used for components such as hinges and handles, gates and balconies before being largely superseded by steel in the late 19th century.

Cast iron became popular following the invention of the cupola furnace in the 18th century. This enabled liquid iron to be poured and cast into moulds in a foundry. Castings were frequently joined together by nuts and bolts or by interlocking the parts. 

Cast iron is brittle and weaker in tension than wrought iron but is quicker and easier to make. Components have a deeper profile and more repetitive appearance. Unlike wrought iron, cast iron has never entirely been superseded by steel.

Wrought iron has a more delicate appearance and, as each piece is formed individually, there is more opportunity for slight variations in the finished piece. 

Feature by Helaine Claire with additional copy by Roger Hunt, Douglas Kent and Melanie Griffiths

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