Quebec – Banking time

We have a few clerical type roles that we allow banking of time to help off-set time when needed away from work for things like doctor, dentist appointments.  These folks are all paid by salary and are expected to work a 40 hour work-week (paid bi-weekly).  If an employee doesn’t show up for work due to weather (not comfortable driving in snow) are we able to mandate payment to them from their banked hours?