Edging & Kerb Calculator
Estimate stones, ballast, and cement for perfect boundaries.
Material Takeoff
Kerb Appeal: Defining Your Landscape
Boundaries with Purpose
In UK landscaping, edging kerbs serve two roles: they provide a clean visual finish and, more importantly, they act as a structural restraint. Without solid edging, driveway blocks or paving slabs will eventually drift outwards.
Our **edging kerb calculator** helps you calculate the precise number of stones and the exact amount of ballast and cement needed to secure them for decades.
Kerb Profiles
The Secret to Straight Lines
The key to professional-looking kerbs is a **string line**. Drive two pins into the ground and stretch a line tightly between them at the exact finished height of your kerb.
Always set the concrete bed first, lay the kerb, tap it down to the string line with a rubber mallet, and *then* add the haunching behind it. If you try to add the haunching later, it won't bond effectively to the bed.
Earth-Moist Mix
Professional groundworkers use a 'dry' mix for kerbs. This means adding just enough water so the concrete holds its shape when squeezed. This allows the kerb to sit on top of the concrete without sinking.
Expansion Gaps
For very long runs (over 20m), it is wise to leave a small 2-3mm gap between every 5th or 6th kerb stone to allow for thermal expansion during hot UK summers.
Pro Tip: Front Haunching
If the front of the kerb will be hidden by soil or turf, add a small haunch to the front as well. This creates a 'u-shaped' concrete channel that makes the kerb virtually impossible to dislodge.
Edging & Kerb FAQ
Technical Disclaimer
Concrete requirements are based on standard haunching profiles. Uneven ground or deep trenching will increase the amount of ballast and cement needed. Always order 10% extra for waste.