combined with lightly gusting wind and a location of previously undetected damage caused the tear. The damaged panel was replaced with a temporary one on January 19 and the roof was re-inflated. The BC Contractors Association held an exhibition in the stadium over the week of January 23, during which the roof leaked in several places when it rained. The temporary panel was successfully replaced with a permanent one in June 2007, just prior to the start of the 2007 CFL season. Renovation and roof replacement On May 16, 2008, it was announced that over $150 million in major renovations would be carried out on BC Place Stadium. The work was done in two phases. The first phase involved upgrades to seating, washrooms, concessions, and luxury suites, as well as the reinforcement of the existing ring beam at the top of the building and was completed in October 2009, in time for the 2010 Winter Olympics. Work on the retractable roof began in May 2010, with PCL Westcoast Constructors Inc. contracted to construct the roof designed by architecture firm Stantec Architecture Ltd. and structural engineering firm Geiger Engineers, with Schlaich Bergermann & Partner serving as consulting engineers and Genivar, Inc. acting as services engineers. Geiger also designed the stadium's new centre-hung scoreboard. The roof's construction began immediately after the completion of the 2010 Winter Paralympics and the final deflation of the air-supported roof. The official budget for the completed Phase 1 upgrades plus the revitalization project was $514 million. The new roof, a cable-supported retractable roof system first used with the Commerzbank-Arena in Frankfurt, Germany, is the largest of its kind. The opening measures , the same size as the field below. The fabric roof retracts into and is hidden by a pod in the centre of the opening, above the suspended videoboard. The updated stadium also features the second largest centre-hung high definition scoreboard in North America, after the one in AT&T Stadium. In addition, a new artificial turf developed by Polytan was installed at an estimated cost of $1.2 million. It is designed to achieve FIFA 2-star certification, the highest rating possible. The soccer pitch is . TSN analyst and former CFL player Chris Schultz praised both the design and engineering of the new stadium. Columnist Brian Hutchinson has praised the renovations for significantly improving the acoustics, and providing a bright and airy feel to the stadium. These