The problem faced by the subcontractor was that its loss was not considered a covered loss under the CGL. While the firm did suffer a financial loss from having to correct its use of unacceptable materials, the event did not create a loss for a third party (other than a possible project delay).
The subcontractor’s installation was a matter of, perhaps, oversight or incompetence, but it did not cause an occurrence eligible for insurance protection. It was, rather, a very expensive inconvenience due to a failure to meet a quality standard. Liability insurance is not designed to be a financial backstop for operational errors that could have been avoided merely by following a checklist when ordering materials.
Click here for a brief discussion of the risk meant to be addressed by Owners and Contractors Protective Liability coverage. It is from the Commercial Liability section of PF&M found in Advantage Plus.