Just blowing insulation in a the wall here without informing building standards it a bit of a no-no, you can just do that in Canada?
Houses typically aren't of (mostly) brick construction. Much more like US stuff, timber frames sitting on top of a brick / concrete basement, lots of drywall etc. When you do external wall insulation it's (I'm mostly guessing here mind) like sticking stuff in a partition wall in the UK; if you want to take the insulation out, you can, by pulling the drywall down and taking it out.
External insulation: peel off outer layer of brick/stucco/vinyl siding.
Nail 1” (at least) hard foam insulation to studs
Wrap with tyvek, tape all joints and windows
Cover with vinyl siding
Houses typically aren't of (mostly) brick construction. Much more like US stuff, timber frames sitting on top of a brick / concrete basement, lots of drywall etc. When you do external wall insulation it's (I'm mostly guessing here mind) like sticking stuff in a partition wall in the UK; if you want to take the insulation out, you can, by pulling the drywall down and taking it out.
Or you just knock the house down and start again.