Layoffs during a recession tend to start in construction and manufacturing as these sectors are very directly influenced by interest rates.
Building permits are down ~30% across the country and continuing to trend down. Once current projects are completed, we won't have enough work for all the construction workers. (
source)
Manufacturing layoffs will go side by side, as the reduction in projects will reduce demand for material.
Anecdotally, this has already started with businesses that I know.
Construction employs roughly 7% of the Canadian workforce (
source)
Manufacturing employs roughly 10% of the Canadian workforce (
source)
I don't expect a 30% reduction in headcount across construction and manufacturing, but 10% sounds about right ... so 270,000 people.
These people are going to spend less, which will lead to the service sector declining and eventually laying people off as well.