Choosing metal fence pickets and planning a fence that lasts

Ask for a section sample and examine its edges up close.

The cross-section shows the difference between a folded sheet metal picket and a heavy hollow section. They respond differently to fastener pressure, cutting and point loads. Specify the length and, where the model allows it, a flat or rounded top. Ordering the right end detail saves cutting every picket on site.

For an upright pattern, choose a profile and supports intended for vertical installation. If you prefer horizontal pickets, check the end details and support spacing in the documentation. On sloping ground, sketch both stepped bays and a fence following the gradient. The choice affects the required lengths.

Judge the spacing on a drawing of a complete bay, including the gaps next to both posts. Closer pickets improve privacy but change the wind load on the fence. Check the capacity of the whole assembly before adding a second row or a screen.

Turn the sample over and compare both faces under the same light. The decorative street-facing colour may differ from the finish seen from the patio. If both faces must match, state that in the order and check it against the model specification.

Hold the picket sample against the gate or a roofing swatch in daylight. A matching colour code does not guarantee the same texture or gloss. Consider exposure as well: road salt and vegetation that stays damp can affect the coating specification.

Trace wind loads from the pickets through the rails to the posts and foundations. A light picket tells you little about the load on a complete bay. Dimensions, gaps and exposure all matter. The same layout may face different conditions beside an open field and in the lee of a building.

Use the chosen system’s documentation to determine rail layout and picket fixings. Do not copy the screw count from a neighbouring fence without checking the profile and bay dimensions. Assess the pedestrian and vehicle gates separately: their frames and hinges also take loads as they move.

Set the top line and lay out the entire bay between the posts before installing the first fixing. A spacer repeats a gap but cannot correct an incorrectly measured bay. Match fixings to the coating and supporting structure. Watch the metal while tightening: a local dent indicates excessive pressure.

Where cutting is necessary, use cold-cutting tools and protect the edge as instructed. Hot swarf can embed itself in nearby coatings. Remove metal particles after installation and inspect any scratches. Keep soil and wet leaves away from the bottom edges.

Cost a measured fence run using the actual profile widths and gaps. Add posts, rails, fixings, foundation preparation and fabrication to the picket price. You can then compare the same finished fence even if the individual pickets differ in length or width.

Keep the cleaning instructions for the specified coating. At inspections, examine the bottom and cut edges, fixings and impact marks. Steel needs different care from timber. The back face and supporting frame also affect service life, so inspect the fence from both street and garden.