Contractors and concrete suppliers know that a failed mix can become more than a technical problem. It can delay a project and trigger expensive repairs. When defective work is alleged, the line between covered property damage and uncovered repair costs can be hotly contested.

On a project for the California Department of Transportation, a supplier provided ready-mix concrete for bridge frames. After the prime contractor placed all the supplied ready-mix, the mix failed to achieve the required psi strength and had other abnormal characteristics.

Caltrans rejected the work, so the entire bridge frames were removed and replaced. The resulting litigation asserted breach of contract, warranties, negligence and misrepresentation, with settlement demands and alleged damages reaching eight figures. United National Insurance Company v. Elite Ready-Mix, LLC, U.S. District Court, Northern District of California, Case No. 25-cv-08540-TSH, Aug. 14, 2026.

The lesson is not that the concrete failed, but in how the court separated the cost of replacing the supplier’s/insured’s defective mix from damage to other property. Commercial general liability and excess policies generally cover personal injury or property damage, not the insured’s work. Here, the parties agreed the insurer was not responsible for the cost to replace the insured’s non-conforming concrete mix. The parties disagreed on coverage for replacement of all the other work, besides the concrete itself (e.g., rebar and embedded steel).

The court concluded there was no coverage because there was no property damage. Caltrans’ rejection of the bridge frames was based upon the potential, not actual, reduced lifespan of the bridge due to the reduced psi strength and other mix abnormalities. Caltrans’ rejection contractually triggered the replacement before any covered property damage occurred. Damages caused during replacement did not trigger insurance coverage.

A deficient slab, girder, wall or batch of concrete may cause demolition, rework, remobilization, schedule compression and disputes with other trades. Those costs do not automatically become insured property damage. If the only proven loss is removing and replacing the defective material, coverage may be unavailable. If the defective material physically damages completed work, equipment or third-party property, the analysis may change.

Causation evidence matters. If a placement fails testing or shows unusual chemistry, the project team should preserve batch tickets, mix designs, supplier certifications, delivery records, placement logs, moisture and temperature data, test cylinders, core samples, photographs, inspection reports and correspondence with the owner and engineer. If other property is allegedly damaged, the team should document what was damaged, when, how and whether experts can connect the damage to the work rather than to later demolition or remediation.

Construction insurance is often layered. Primary liability, builder’s risk, subcontractor policies and performance bonds may respond differently to the same event. A settlement demand may not trigger every available policy. Risk managers should review policy language before a dispute arises, focusing on occurrence, property damage, your product, your work, impaired property, rip-and-tear costs, consequential damage and completed operations.

Preconstruction planning can reduce the risk of a coverage fight. Suppliers and contractors should align purchase orders, mix specifications, submittals and insurance requirements. If a substitute cementitious material or admixture is used, the approval trail should be complete and readily retrievable. Quality-control procedures should identify who may approve changes, who receives test results and when nonconforming work must be escalated.

Communication with insurers is important. Timely notice and thorough claim packages are essential. Avoid broad conclusions. Saying defective concrete “damaged the bridge” is less useful than explaining whether rebar corroded, formwork was impaired or replacement was required only because the concrete could not remain in place.

Specific records improve the ability to pursue coverage or challenge a denial. A solid defense includes a consistent project record, a well-supported chain of approvals, and a risk-management program that understands fixing your work versus responding to damage your work causes. That difference can decide who pays for the rebuild.

Jon Straw is a partner with Kraftson Caudle, PLC, a law firm in McLean, Va., specializing in heavy-highway and transportation construction. Straw can be contacted via e-mail at [email protected].