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  • 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.

    Or you just knock the house down and start again.

  • 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

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