Curved walls are actually easier to build and faster to build than a 90-degree corner and/or a mitered angle. In addition, they are typically more economical to build and in fact are preferred and recommended when a change of direction is required with your Allan Block retaining wall.
How do I start a curved retaining wall?
First, we always suggest laying out your wall with a garden hose or something flexible to allow for curves – spray paint may also be a choice for the creation of your outline. The radius may be easiest to create by using a string line that is a length equivalent to your radius and a stake as shown here.
Once the desired shape is achieved, the type of curve will dictate how you begin installing it. There are two types of curves – an inside or outside curve.
From the point of where the curve will start, measure straight back from the wall the required distance and drive a stake into the ground. This will be the center of the curve. Attach your string line to the stake 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 marks. Using these tips and tools will allow you to ensure the finished shape is what you are anticipating.
When building an inside curve, simply lay the Allan Block units out on the intended radius to meet the look or need of your site. When building an outside curve, the rear wings will need to be removed for proper placement of the block on your desired radius.
Before installing the base row of blocks on your intended radius check out our basic install steps to ensure proper installation.
Keep in mind the minimum radius at the top of your Allan Block retaining wall is dictated by the width of the wall unit. An AB Classic unit will allow for a 4 ft. 11 in. (1.5 m) radius and a AB Jumbo Junior unit will allow for a 3 ft. 5 in. (1 m) radius on a 3ft. (0.9 m) high wall– check out the AB Radius Charts and additional radius information at allanblock.com