Dry-laying versus mortar
A dry-laid path sits on a granular setting bed with open or sand-filled joints. It flexes slightly with ground movement and drains freely, which is why it tolerates freeze–thaw cycles well. A mortared path needs a rigid concrete base; without one, the mortar joints crack as the ground moves. For most garden paths in freezing ground, dry-laying is the more forgiving method.
The setting bed
On top of the compacted sub-base, spread a thin, even bedding layer and screed it flat. The bed should be just thick enough to seat each stone fully. Too deep a bed behaves like loose fill and lets stones rock.
Seating each stone
- Set the stone, then tap it down until it makes full contact with the bed.
- Check that it does not rock. A stone that rocks on two points will work loose.
- Keep the walking surface even so there are no raised edges to catch a foot.
Jointing
For dry-laid surfaces, fill the joints with a free-draining material such as coarse sand or fine grit so water passes through rather than sitting on top. Tight, consistent joints look intentional and reduce the gaps where weeds establish. Avoid sealing joints solid on a flexible base, because a sealed surface traps water and pops in frost.
For a stepping-stone path through lawn or planting, set each stone slightly below the surrounding grade so a mower passes over it and the stone drains. Space the stones to a comfortable, even stride.
Edge restraint
Edge restraint is what holds everything together. Without a defined edge, the bedding and stones slowly spread outward and the joints open. A row of set edging stones, a timber edge or a haunched border all work; the key is that the edge resists the sideways push of foot traffic and freezing.
Finishing and first winter
Once the path is laid and jointed, firm the surface and top up the joints after the first rains settle the fill. Expect minor settlement over the first season. A path built on a compacted, free-draining base should need only small touch-ups rather than relaying.