Old Canaan Building Materials

The railings on a traditional New England house are either right or they are wrong, and it is very difficult to make them right with anything other than wrought iron or its closest contemporary equivalent, steel. Aluminum railings, regardless of how they are finished, read as aluminum. Composite railings read as composite. Wrought iron reads as wrought iron, and it has been reading that way on the staircases, terraces, and garden gates of New England houses since the eighteenth century.

True wrought iron has a quality of surface and a slight irregularity of profile that distinguishes it from cast iron and from mild steel. It is worked by hand at the forge, and the hammer marks, the slight variations in section, the way it takes a finish — all of these are specific to the material and its process. Contemporary blacksmiths working in mild steel can produce work that approaches this quality when they choose to work by hand rather than relying entirely on stock profiles and welded connections.

The best ironwork on traditional New England houses is simple. A plain square section baluster, a slightly tapered newel post, a scrolled handrail return. Elaborate ironwork reads as decorative rather than structural, and the best traditional ironwork in this region has always leaned toward the structural. It is there to hold onto and to mark a boundary. It does this with the minimum of ornament consistent with its dignity.

True wrought iron, a low-carbon iron worked at the forge, is rarely produced commercially today. What is specified as wrought iron in contemporary construction is almost always mild steel — low-carbon steel that can be forged, welded, and finished similarly to historic wrought iron. For traditional applications, hand-forged mild steel by a blacksmith is the closest available equivalent and the appropriate specification.

Cast iron, by contrast, is poured into molds rather than worked by hand. It has a different surface quality, a different profile character, and is appropriate for different applications — decorative column capitals, ornamental fence panels, historic reproduction hardware. Cast iron railings are not traditional for residential New England work in the way that wrought iron railings are.

Iron rusts. This is its primary behavioral fact, and managing it is the primary maintenance requirement of iron work on a traditional house. A well-prepared and well-painted iron railing should hold its finish for five to ten years before repainting is required. The preparation is everything — bare metal must be clean, dry, and primed with a rust-inhibiting primer before any topcoat is applied. Paint applied over rust or mill scale will fail at the interface within two to three years regardless of the quality of the topcoat.

Oil-based paint is the correct topcoat for exterior iron work. Color is almost always black on traditional New England work — occasionally dark green or dark red on garden gates and fencing, but black is the default and it is the correct default. It reads as serious without reading as heavy.

For railings, gates, and hardware on traditional properties, engage a blacksmith or architectural metalwork fabricator who works by hand. Ask to see examples of their work on comparable projects. Specify simple profiles. Square section balusters, 1/2 to 5/8 inch, are traditional for residential railings. Spacing at 4 inches on center maximum for code compliance. Handrail profile should be comfortable to grip — a round or oval section, 1.25 to 1.5 inches in diameter. Finish in oil-based paint, black, after proper priming.