Proper Excavation & Base Preparation for Boulder Retaining Walls
In our experience, the long-term stability of a boulder retaining wall comes down to the base work before any stones are set. Because boulder walls rely on weight and placement rather than interlocking systems, the foundation has to be solid and properly prepared.
Utah’s clay-heavy soils can shift with moisture and seasonal changes, so we focus on building a stable base and planning for drainage from the start.
Our process includes:
-
- Excavating to the proper depth for the wall height
- Removing loose or unstable soil
- Installing a compacted base to support the weight of the boulders
- Planning for drainage behind the wall to prevent pressure buildup
- Positioning boulders for stability, not just appearance
When a boulder wall exceeds 4 feet in height, engineering and permits are typically required. We handle that process when needed to ensure the wall is built safely and correctly.
Boulder Sourcing, Sizes & Placement
We work with local quarries and landscape suppliers to source natural stone that fits both the structure and look of your project. Most boulder retaining walls in our area are built using local stone that naturally blends in with our natural surroundings.
Common boulders we use include:
-
- Quartzite boulders, one of the most common stones used along the Wasatch Front
- Sandstone boulders for a warmer, more natural color range
- Granite or mixed mountain stone for larger structural walls
Depending on the project, stones can range from a few hundred pounds to several thousand pounds each. We have the equipment needed to transport and place these stones safely and precisely.
Access is always part of the planning. Tight backyards, slopes, and existing landscaping can affect how we stage and build the wall, so we evaluate that upfront. Boulder placement is done intentionally so the stones lock together and provide long-term structural stability.
Rebuilding a Failing Boulder Wall
We’re often called to look at boulder walls that are leaning, settling, or starting to separate. In our experience, most problems trace back to poor base preparation or a lack of drainage behind the wall.
Common signs of failure include:
-
- Stones shifting or rolling forward
- Gaps opening between boulders
- Soil washing out from behind the wall
- Bulging sections or uneven settling
- Water pooling at the base or seeping through
When we evaluate your wall, we look at the base, soil conditions, drainage, and overall structure. In some cases, a section of the wall can be reset and reinforced. In other situations, especially if the foundation has failed, rebuilding the wall correctly is the safer and more cost-effective long-term solution.
Our goal is to fix the root problem so the wall performs the way it should for years to come.
Serving the Salt Lake City Metro Area
We build boulder retaining walls throughout:
- Salt Lake City
- West Valley City
- West Jordan
- South Jordan
- Murray
- Draper
- Midvale
- Taylorsville
And surrounding areas across Salt Lake County
