The basement of my house is bare concrete floor with bare concrete block walls. I'm in Canada and would like to (and should) insulate these walls, at least the above-grade portion, which is about 18". The previous home-owner installed two dividing walls that make contact with the brick but there is no other framing along the perimeter of the basement.
If I'm going to put up insulation against the outer wall, should I remove the existing wall, at least the studs connecting to the brick first to provide a good heat seal, or leave them in place and insulate around them?
For context, the plan is to eventually finish the basement completely but begin with the heat losses.