Retaining Wall Curves

Accent any landscape
with curved walls.
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retaining wall with curves

AB Collection retaining wall


Inside Curves Outside Curves Retaining Wall

Curves accent and design


Building Curves

Building curved and serpentine retaining walls is simple. 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

Base course radius for an outside curve on a 4 ft (1.2 m) tall 6° retaining wall


Start retaining wall curve

How to start a curve


Working with Radii

Refer to the Radius Chart to confirm that the AB product you are using will accommodate the desired wall radius.

The tightest or smallest radius at the top of any AB wall using full size block is 4 ft. (1.2 m), and 2.5 ft. (0.8 m) using the half width blocks. The final height of the wall will determine what the minimum radius at the base course must be.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.

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).


Starting a Radius

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

Tight outside retaining wall curve

For a smooth curve with less cutting, use our half width blocks to help build the curve.


Curves with Reinforcement

When placing geogrid along curved retaining 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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