Racking or stepping a fence on sloped ground

A fence is built from rectangles and the ground is not rectangular. Every fence on a slope resolves that conflict one of two ways. Either the rectangle deforms into a parallelogram so the fence follows the ground, which is called racking, or the rectangles stay square and drop in steps, which is called stepping. Both are correct construction. They look completely different and they suit different ground.

Racking

In a racked fence the rails run parallel to the ground and the pickets stay vertical, so the panel becomes a parallelogram. The top line of the fence follows the grade and there are no gaps underneath. It looks continuous and it contains animals without extra work.

The limit is how far the panel will pivot. Manufactured aluminum and vinyl panels are sold as rackable up to a stated amount of drop per section, and past that they physically will not go. Wood built on site racks further than almost anything, because the rails are attached individually and can simply follow the ground. That is one of the reasons wood remains popular on genuinely difficult terrain around Pine Mountain and the Harris County ridges.

Stepping

In a stepped fence each panel stays a true rectangle and sits level, dropping a fixed amount at each post. The top line becomes a staircase. This is the right answer where the grade changes abruptly rather than steadily, where the panel style will not rack, and where a level top line is wanted for appearance, which is often the case with formal aluminum panels along a street.

The cost of stepping is the triangular gap under each panel. On a gentle slope that is a couple of inches and nobody cares. On a steep one it can be large enough for a dog to walk through, which defeats the purpose entirely.

Closing the gaps

• Rot board. A wide treated board along the bottom, scribed to the ground, closes most of the gap and takes the ground contact instead of the pickets. This is the usual answer on wood.
• Grading fill. Bringing soil up under the panel, which works where the ground is being landscaped anyway and drainage is not disturbed.
• Landscape timbers or a low retaining course. More work, but it makes a permanent tidy edge.
• Planting. Fine for appearance, useless for containment. Choose it only when a dog is not the reason for the fence.

Whatever closes the gap should not dam water. On a slope the fence line frequently sits across the path water takes downhill, and a solid barrier at the bottom of a fence can pond water against it, which is bad for the fence and worse for the neighbor below.

Gates on a slope

Gates are the part of a sloped fence that most often goes wrong, because a gate has to swing through an arc and the ground rises into that arc. A gate hung on sloping ground either swings only downhill, which halves its usefulness, or needs the ground cut level through the swing path, or needs to be hung high enough to clear the rise, which leaves a gap under it.

The solutions are to locate the gate on the flattest available section, to level a pad through the swing, or to use a gate that slides rather than swings. Deciding this while walking the line, before anything is built, costs nothing. Deciding it after the posts are set costs a good deal.

What to ask when quoting a sloped yard

Ask which method the quote assumes, because they are different amounts of labor and a quote priced for flat ground on a sloped yard will grow. Ask what happens at the gaps if stepping is planned. Ask where the gates are going and which way they will swing. And walk the line together, because slope is one of the site conditions that genuinely cannot be judged from a satellite image.

Call (706) 786-4625 or use the quote form and a local fence company will walk it with you. The post and footing guide covers what happens below ground, and the Columbus installation guide covers the project end to end.