Generally speaking all the stones should be removed right down to bare dirt when stripping out.
Dry stone retaining wall detail.
Dry stone retaining walls.
Use a hand or power tamper to level the base.
Retaining walls convert sloping ground into usable level spaces.
Dry stone walls are almost always built with a batter which is the inward slope of the front face of the wall.
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The stone trust has written detailed engineering specifications for dry stone retaining walls for use by contractors and designers click here to access these design specs.
For dry stack walls the base should be as wide as the wall is tall.
The stability of such walls depends upon the arrangement of stones in the wall and the friction between the individual stones.
If the ground is level above and the footing is stable below the simplest form of retaining wall is appropriate.
This is the simplest form of retaining wall.
For this 18 inch high wall the footing should be at least 18 inches wide.
The stone trust provides design consulting services for dry stone walls and structures.
Standard specifications for dry stone retaining walls.
The stones used in the wall should be of large size and roughly hammer dressed so as to ensure maximum bedding area.