The employer raised a preliminary objection that the union's construction industry grievance should be dismissed due to delay.
The union filed the grievance in May 2001, alleging the employer used non-union workers for carpentry work on a golf course project starting in June 2000.
The Board found that the union ought to have known about the alleged breaches by August 2000.
The Board held that the grievance was a continuing grievance, meaning the 90-day time limit applied to each repetition of the breach.
The Board declined to exercise its discretion under section 48(16) of the Labour Relations Act to extend the time limits for earlier breaches, as the union failed to provide a reasonable explanation for the delay.
The grievance was permitted to proceed, but relief was limited to violations occurring within 90 days prior to the filing date.