Ottawa Cleaners Strike

Q194: When will the Ottawa cleaners represented by SEIU Local 2 go on strike?
Before August 15th; 20%
Between August 15th and the end of 2015: 15%
Not before the end of 2015: 65%
(Any sort of significant work stoppage counts for this question, even if it is not described as a strike.  If a new contract is announced, the question will close for "Not before the end of 2015")

Ottawa janitors (many of whom work in government buildings as employees of private contractors), have given a strike mandate to their union, SEIU Local 2 (see story here).  A strike could begin in the first week of August, although negotiations are scheduled before then.

My default position on this sort of question is that a strike is unlikely.  Having said that, the union seems to want a much higher wage ($15 vs the current $11.50 per hour), which is a sign that the negotiating positions of the two parties are still a ways apart.  If a strike does happen, I think it will probably start in early August, but it could start later than that.