Curved Retaining Walls

Flowing curves accent
any landscape.
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retaining wall with curves

AB Europa retaining wall


Inside Curves Outside Curves Retaining Wall

Curves accent and design


Curves & Serpentines

How to build a curved retaining wall

Video: How to build a curved retaining wall

Whether you choose soft curved retaining walls or classic straight retaining walls, Allan Block has the system to satisfy every design.

Curves accent any landscape, are simple to design and easy to build. Consider how tight or gentle you want the curves to be and choose the block or combination of blocks that are best suited for your design. See the radius chart for more information.

Building Curves

Allan Block’s patented design allows for easy installation of both inside and outside curves. Most curves can be built with no cutting involved.

Offset the vertical seams

Offset the vertical seams

Inside Curves

Outside Curves

Remove wings off block

AB Fieldstone: Remove wings off blocks

Remove wings off block

AB or AB Europa: Remove wings off block


NOTE: An AB Fieldstone 812 assembly is recommended for building curved retaining walls. The 824 assembly will work in large gradual curves only.

Remove wings off block
Minimum radius retaining wall

Minimum radius of a retaining wall


Start retaining wall curve

How to start a curve


Determining the Radius

Curved walls have a greater setback, which causes a coning effect to occur causing your retaining wall to have its tightest radius at the top of the wall which in turn creates the need for a larger radius at the base course.

The final height of the wall will determine what the minimum radius at the base course must be. Use the radius chart to determine what the minimum recommended radius of the base course of the wall needs to be, so the top course of the wall will not be less than 4 ft. (1.2 m).


Depending on the block you choose, the tightest radius at the top of the retaining wall is:


Starting the Curve

From the point of where the curve will start, measure straight back from the wall the required amount (shown in the radius chart) and drive a stake into the ground. This will be the center of the curve. Attach a string line to the stake the length of the radius and rotate it around to mark the location of the base course. Install the blocks with the front of the blocks lining up with the mark.

Tight Inside retaining wall curve

Cutting the bottom notch for tighter inside curves


Tight outside retaining wall curve

Cutting the bottom notch for tighter outside curves


Building Tighter Curves with AB or AB Europa

Curves with Reinforcement

When placing geogrid along curved walls, the geogrid should follow the back of the lip on the retaining wall block. Simply slit the geogrid with a utility knife and either feather out or overlap to follow the curve.

Inside Curves and Geogrid

Inside Curves with Geogrid

Inside Curves with Geogrid


Outside Curves with Geogrid

Outside Curves with Geogrid

Geogrid needs to have 100% coverage around any curve. To achieve this, additional layers need to be installed above the course where the geogrid is required to fill voids that are created.




Outside Curves and Geogrid

Cutting Cap for Curves

Place two caps on top of the wall, spaced so a third cap will fit tightly between their widest point


Cutting Cap for Curves

Mark the overlap on the bottom of the center cap


Cutting Cap for Curves

Cut cap on marks to fit between caps


Cutting Cap for Curves

Measure the distance of the gap between the 2 caps (x) at the front of the wall


retaining wall with curved stairs

AB Europa retaining wall with curved stairs


Capping Curves

If you are using AB Fieldstone, follow instructions on capping AB Fieldstone.

More options for finishing your retaining wall.



Capping Tighter Curves

If you are using AB Fieldstone, follow instructions on capping AB Fieldstone.

More options for finishing your retaining wall.

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