Starting to get cold in the house, I want to try to tough it without the heat till at least September.
Insulated the fire place hole at least.
The vapour barrier needs to be redone though, I tried to use some scrap sections I had lying around but they are not quite wide enough and I ran out, so I'll do it proper and cut a new section some time. I just don't want the cat eating the insulation so it will do for now. I need to open up that wall a little bit more to fix it properly, will do that another time.
I think I will not bother to redo the entire wall, maybe with simply that part insulated it will help my heat loss issue. If not I may very well tear out the complete wall so I can reinsulate. If I do the whole wall I'd do it proper and use roxul.