You can actually do noninvasive with blown in insulation instead of foam and that won’t cause your walls to bow. TBH that’s what I would do first, and attic insulation if you haven’t got any.
You can actually do noninvasive with blown in insulation instead of foam and that won’t cause your walls to bow. TBH that’s what I would do first, and attic insulation if you haven’t got any.