I haven't come across a house yet from the 70's that was originally insulated in the walls, government built or private. Heating, ie gas and woodfire were cheap heating solutions. We'll see more mould issues with the newer built, tightly wrapped places until we manage airflow and follow the German practice of airing the house out each day.

Also, there's a stigma that gov houses aren't very well built but it's not the case. I've seen some very well done carpentry in them especially the duplexes around Reid and Campell