ENGINEERED 
RETAINING
WALLS®

The clearest signs of defective retaining wall construction are: no visible drainage outlets anywhere along the wall face or ends; soil backfill right behind the wall blocks instead of clean crushed stone; the wall is leaning or bulging within the first few years; blocks are separating or the wall has no backward lean (batter) on tall sections; no geogrid layers visible in any exposed areas; or the wall was built over 4 feet tall without a permit or engineering. Most failed walls show two or more of these defects simultaneously.

The most common contractor mistakes that lead to premature failure are: no drainage system whatsoever (the single biggest cause); inadequate base depth — less than 6–12 inches of compacted gravel; skipping geogrid reinforcement on walls taller than 3–4 feet; using native clay soil instead of clean crushed stone for backfill; building walls too tall for the block system being used; and failing to terrace tall walls into multiple stepped levels when required by the engineering. Most failed walls have two or more of these defects at once.

Yes — absence of a drainage system is the primary construction defect we see on failed retaining walls. Every engineered retaining wall must have a clean-stone drainage zone behind the blocks, a perforated collection pipe at the base, and drainage outlets that allow water to escape. Without these, hydrostatic pressure builds after rain and can exceed the wall's structural capacity within a single storm event. This is not a maintenance issue — it's a construction defect, and it's documentable by any licensed engineer who inspects the wall.

Proving contractor fault requires documenting what's missing versus what was required. Photograph the failure to show missing drainage, wrong backfill material, no geogrid, or improper base. Compare visible conditions against manufacturer installation requirements or the engineering specifications if available. A licensed engineer can then confirm in a written report which specific defects were present and state whether those defects — not rainfall or age — were the primary cause of failure. This report is what survives insurance review or legal proceedings.

For a defective wall claim, photograph: the entire wall face showing any lean, bulge, or separation; any exposed sections showing missing geogrid layers; the base of the wall where drainage outlets should be (document their absence clearly); backfill material visible in the failure zone (should be crushed stone, not clay); and any water staining, soil blowouts, or efflorescence indicating trapped water. Take photos before, during, and after any excavation so the internal construction conditions are permanently documented.

Yes — a licensed Professional Engineer can inspect a failed wall, identify root cause, and document whether missing drainage, insufficient reinforcement, improper base preparation, or incorrect wall height contributed to the failure. The engineering report can explicitly state which specific defects were present and whether those defects caused the failure. For contractor disputes, insurance claims, or legal proceedings, a PE-stamped forensic report is the most credible evidence available.

Yes — in NC, GA, and TN, any retaining wall over 4 feet tall, any wall supporting a structure or driveway, or any wall on a steep slope must have a licensed engineer design the wall and a building permit must be obtained before construction begins. A contractor who builds a tall wall without a permit has violated code. If your wall was built without permits and it failed, that lack of permitting is itself evidence of defective construction practice and strengthens any insurance or legal claim.

Rain exposes defects — it doesn't create them. A properly engineered retaining wall with adequate drainage should handle mountain rainfall without failure. When a contractor says the rain was too heavy, they're describing a wall that wasn't designed or built for the conditions it was placed in. A forensic engineering review will typically show that the underlying cause was missing drainage or insufficient reinforcement, with rainfall as the triggering event rather than the root cause — which is exactly the distinction that matters for liability.

No — do not repair, clean up, or alter the wall before the failure is fully documented. Teardown destroys evidence: the missing geogrid layers, wrong backfill material, and absent drainage system are only visible during excavation, and once the wall is removed, that evidence is gone permanently. Document everything first with a full photo and video set, then have an engineer or ERWalls assess the wall before any materials are moved. Only after documentation is complete should repair or demolition begin.

Yes — we routinely take on rebuilds of failed contractor work. During demolition we document existing conditions thoroughly, identifying missing drainage, wrong backfill, missing geogrid, inadequate base, and any other defects found. We produce a written summary of observed defects and provide it to you for insurance, legal, or contractor dispute purposes. Our rebuild then corrects every defect with proper engineering, drainage, and reinforcement — guaranteed not to fail.