How to Lay Artificial Grass on a Slope or Terraced Section

Anyone who has tried to garden on a hillside section in Wellington, Dunedin or the Auckland volcanic cones knows the frustration of a sloped backyard. Mowing is awkward, natural grass struggles to hold soil in place, and erosion after heavy rain is a constant headache. It is also one of the situations where artificial grass genuinely solves a real problem, provided it is installed with the slope in mind rather than treated like a flat lawn.

Why Sloped Sections Need Special Handling

On flat ground, water drains straight down through the base. On a slope, water also wants to run sideways, which means both the turf and the layers beneath it need to be secured so they do not slip, and the drainage path needs to be managed so water does not simply wash straight down and erode the base at the bottom of the section.

Preparing a Sloped Section Properly

Terracing and Retaining

For steeper sections, breaking the slope into smaller terraced levels with retaining walls or timber edging is often the safest long term approach. It reduces the effective gradient the turf sits on and gives you flatter, more usable areas rather than one continuous incline.

Anchoring the Base

The compacted aggregate base still needs to go in, but on a slope it is built and compacted in a way that resists sliding, often with additional edging or anchor points at the base of the slope to hold everything in place.

Choosing the Right Infill Weight

A heavier or more compacted infill is generally used on sloped installs. This adds extra weight to hold the turf in position and reduces the chance of infill migrating downhill over time, which is a common issue when a flat-ground infill approach is used on an incline.

Securing the Turf So It Does Not Slip

• Ground staples and nails are spaced more tightly on slopes than on flat lawns
• Seams are positioned running across the slope rather than up and down it where possible
• Edges at the top and bottom of the slope are given extra fixing to stop movement

Steep or Terraced? Know When to Call in the Experts

A gentle slope in a suburban backyard is a manageable job for an experienced installer. A genuinely steep bank, however, often needs retaining structures, engineering input, or specific drainage solutions before turf even comes into the conversation. It is worth getting a proper site assessment rather than guessing, particularly if the slope sits above a neighbouring property or a structure.

Turning a Tricky Slope Into a Low-Maintenance Feature

Once it is done properly, a sloped section with artificial turf becomes one of the lowest-maintenance parts of the property, no more awkward mowing on an angle, no more bare patches where the mower could not reach, and far less erosion after a wet week. TigerTurf’s design team can assess your section and recommend the right terracing and drainage approach before any turf goes down. For ideas on the wider backyard design, our piece on designing a low-maintenance backyard with turf is worth a read.

Got a slope or terraced section you would like assessed? Request a free quote and TigerTurf will come back with an honest recommendation.

Quick Questions Kiwi Homeowners Ask

How steep is too steep for artificial grass?

There is no fixed cut-off, but as a general rule, anything beyond a gentle incline benefits from terracing or retaining rather than a single continuous run of turf. A site assessment is the only reliable way to know for your specific section.

Will the infill wash away in heavy rain?

Not if the right infill weight and base preparation are used. A common mistake on slopes is using the same lightweight infill and base approach as a flat lawn, which is exactly what leads to infill migrating downhill over time.

Can I still mow the edges or trim around garden beds?

Yes, and this is actually one of the benefits, since artificial grass on a slope does not need mowing at all, edging around garden beds or retaining walls becomes a one-off installation detail rather than an ongoing chore.