In 1999, a portion of the roof collapsed on January 18, dumping ice and snow on workers that were setting up for the annual Montreal Auto Show. The auto show and a boat show the following month were canceled, and the auto show left the venue for good (since then, the Montreal Auto Show has usually been held at the Palais des congrès de Montréal). Repaired once again, the roof was modified to better withstand winter conditions: the OIB installed a network of pipes to circulate heated water under the roof to allow for snow melting. Despite these corrective measures, the stadium floor remained closed from December to March.