Severely Cracked and Leaning Retaining Wall Repair, Engineered Stabilization Without Replacement
- rebecca andrews
- 1 hour ago
- 3 min read
Ongoing Movement and Progressive Failure on a Challenging Massachusetts hillside
With decades of tree root and soil pressure, this severely deteriorated retaining wall had had been a real cause for concern for both neighbors on this Sommerville, MA property
Towering above a garden patio below, and built into a steep hillside, this 15+ foot concrete retaining wall was holding back the entire grade of the backyard in the propery above. Over time, severe structural cracks developed from tree roots and soil pressure, which had progressively widened in multiple sections of the wall.
The wall showed clear signs of structural distress, including measurable displacement and tipping at the top, as well as long diagonal cracks extending down the broken sections, requiring urgent attention.
Everything below it, including the neighboring yard, fencing, landscaping, and pergola, sat directly in the line of failure.
A Tight Site with No Room for Mistakes
Walls in this condition are often removed and replaced. But on a site like this, that approach would have introduced significant risk and cost impacts to both property owners.
The site conditions made the situation much more complicated, with the wall built into a steep slope with limited access from both above and below. With no clean staging area, no easy equipment positioning, and very little room to move materials, every part of the repair had constraints to consider.
Getting the Wall Working as One Again
Since the vertical cracking extended across multiple broken sections, the structure was no longer transferring load properly. To ensure the wall functioned as a single system all voids needed to be filled in a high compressive strength material prior to the CFRP installation.
The large cracks and voids were repaired and filled flush using SRS-2000 Structural Epoxy Paste, reconnecting the wall internally to enable it to transfer load as a unified structure, while also creating a smooth surface profile for the carbon fiber to transition across the filled areas.
Stabilizing Movement Reinforcing Beyond the Cracks
SRS-660BI Carbon fiber was installed over the major crack zones, handling localized stress and reinforcing the most compromised areas.
A full grid of SRS-600UNI Caron Fiber was installed as a global strengthening grid that ties the whole wall together, redistributing loads across the entire surface. Instead of individual broken wall sections behaving independently, the retaining wall can perform as one reinforced structure.
Installation Under Real Conditions
A comprehensive retaining wall reinforcement system is effective only when it is correctly engineered and properly installed. And on a site like this, it requires a contractor and engineer knowledgeable about both the materials and challenging site conditions.
AJA Engineering, a local company from Marshfield, MA, serving as the EOR, identified that a non-invasive surface-applied solution was appropriate for this project and collaborated with SRS to create an innovative method using carbon fiber. Marsh X Development carried out the installation with precision and care, skillfully managing the site's constraints with outstanding care.
Weighing up Repair Vs Replacement
Replacement here would have meant:
Major excavation on a steep hillside
Increased risk to the neighboring property
Significant disruption to both properties
Instead, the wall was:
Stabilized in place
Reinforced as a complete system
Brought back into structural performance without removal
Take a Closer Look
An exterior paint was selected as the final coating to hide the carbon fiber and shield the epoxy from prolonged UV exposure. Thanks to the ultra-thin profile of the CFRP system, the completed installation seamlessly integrated with the surrounding environment.
If you have a project that would benefit from our support and engineering expertise to bring it to completion, we're ready to assist. Contact us today.
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