bluGill t1_jacxofp wrote on February 28, 2023 at 3:21 PM

Ask your local building inspector. What they will pass or fail is always the first consideration. I'm in particular concerned about vapor barriers as what you described sounds wrong, but I'm probably just concerned. You do not want the problems of wrong vapor barriers down the road.

If the inspector will allow it I'd put insulation in these walls, but no more vapor barrier. It may not meet the letter of local code, but it should meet the intent so I think your inspector will allow it - but your inspector should know more than me, so if he describes reasons not to listen.

hoppyending OP t1_jad0kff wrote on February 28, 2023 at 3:40 PM

I was describing the existing exterior wall insulation and vapour barrier, installed by the original builder, and inspected by the town. I know that part is built correctly.

I think the general consensus in the comments is that I'd see minimal gains while complicating compliance with the Ontario building code, so I'm just going to leave it as is.