1. Planning the line and dimensions

Before moving a single stone, mark the wall line with pegs and string. Determine the wall's purpose: a field boundary wall behaves differently from a retaining wall holding back a slope. A boundary wall in the Polish lowland belt typically runs between 0.9 m and 1.2 m high; a retaining wall on a Carpathian hillside may need to be considerably shorter per course to remain stable.

Standard proportions for a freestanding wall call for a base width of roughly half the intended height. A wall 1 m high, therefore, should start with a base around 0.5 m wide, tapering to 0.35–0.4 m at the top. This slight inward slope on both faces — called the batter — is what gives the structure lateral stability.

Batter guide

A common rule used by wallers in the British Isles and applicable to Polish conditions: for every 300 mm of height, each face should lean inward by approximately 25–30 mm. Use a batter frame — a simple wooden or metal gauge — to check the angle as courses rise.

2. Stripping and foundation

Remove topsoil and organic material along the wall line until you reach firm, undisturbed ground or subsoil. In the Carpathian foothills, you may encounter clay layers that expand when wet. If so, excavate slightly deeper and lay a thin bed of compacted gravel or crushed stone to improve drainage beneath the foundation.

The foundation course is the most important part of the wall. Use the largest, flattest stones available. Lay them with their longest dimension running across the wall width (perpendicular to the wall line), not along it. This creates an interlocked base that resists sliding. Foundation stones should be set slightly below ground level on firm ground.

3. Building the faces

Dry stone walls are double-faced: two rows of stones run along each side of the wall, with the gap between filled with smaller material. The outer faces take the weather and carry the visual line; the fill provides mass and internal friction.

Face stones

Each face stone should be placed so that it overlaps the joint of the two stones below — a rule described as "one over two, two over one." This bond prevents vertical cracks from running up the face. The stone should slope very slightly inward toward the wall centre so gravity keeps it in place rather than pushing it outward.

Hearting

Hearting is the term for the small stones packed tightly into the core between the two faces. It is not rubble thrown loosely — each piece should be wedged to prevent movement. Good hearting locks the faces together and prevents the wall from "bellying" outward under its own weight over time.

Face batter (both sides) ——→ inward taper
Course 1 (foundation): widest stones, crosswise
Courses 2–N: face stones bonded, hearting packed
Through stones every ~600 mm height
Coping: upright or flat cap course

4. Through stones

At intervals of roughly 600 mm in height (and every 600–900 mm along the length), a through stone should be inserted. A through stone spans the full width of the wall from face to face, tying the two leaf together. Without through stones, a double-faced wall will eventually splay apart under soil pressure or freeze-thaw stress. In Poland's upland regions where winters can be severe, omitting through stones is a common cause of wall failure within a decade.

Through stones are often the hardest to source because they must be long enough to span the wall width. Flat slabs of local sandstone — common in the Flysch Carpathians — are well suited to this role.

5. Coping

The coping course seals the top of the wall and holds the uppermost courses together. There are two main approaches: flat capping stones laid horizontally across the full width, or upright coping stones (sometimes called "soldiers" or "camber" stones) set on edge along the top. Upright coping is more common in the British tradition but is used in some Polish highland areas too. Either method works, provided the coping stones are heavy enough to resist displacement by wind, livestock, or frost heave.

In areas where the wall is accessible to cattle or deer, heavier coping or a slightly higher wall is worth considering. A cow leaning against a coping course is one of the most common causes of wall damage in agricultural landscapes.

6. Drainage considerations

One advantage of dry stone over mortared construction is that water passes freely through the structure. This is particularly important on hillsides where hydrostatic pressure can build up behind a wall after heavy rain. On retaining walls, ensure the backfill on the uphill side drains freely — coarse gravel or crushed stone directly behind the wall, not compacted clay. On flat sites, the foundation drainage trench described in section 2 is usually sufficient.

References

Last updated: May 2026