The Problem
Plastic snap edging gets a bad reputation for kicking up and tipping over, and the usual cause is where it was set: on top of the bedding sand. Sand doesn't hold the spikes, and water migrating through the joints undermines the edging until it leans away from the pavers.
The Technique
- After the pavers are laid, pull the bedding sand back along the border until you're down to the compacted aggregate base. The edging never sits on sand.
- Set the snap edge on the aggregate, tight against the outside face of the pavers, with its top about 3/4 inch below the paver surface.
- Start with a 10-inch spike in the first two holes at each end of a run.
- Then spike every other hole along the run, and double up the spikes at the ends.
- Drive each spike at a slight angle, turning it in as it goes, while holding the edging tight against the paver. The angled spike pulls the restraint toward the field instead of letting it drift.
- Backfill aggregate against the outside of the edging and work it in so there are no voids.
Pro tip: The 3/4-inch setdown isn't sloppiness — it lets soil and grass grow up over the restraint so the plastic disappears at the finished grade.