In a construction dispute over a roofing contract, the plaintiff contractor sought payment of an outstanding balance while the defendants counterclaimed alleging defective workmanship and water damage.
During trial, a voir dire was conducted to determine the admissibility of defence expert reports served after a court‑ordered deadline and partially based on destructive testing conducted outside the presence of the plaintiff’s expert.
The court granted leave to admit a late-served expert report concerning building design because the delay caused no prejudice and did not delay the trial.
However, the court excluded opinion evidence derived from destructive testing performed after the plaintiff’s expert had left the premises, finding the testing occurred contrary to a prior court order requiring the plaintiff’s expert to be able to attend.
The court held that the probative value of such evidence was outweighed by its prejudicial effect due to the unfairness created by unilateral testing.