I'm redoing the back room of a 1970s build property, we noticed in the past we had some mould growing and the room was always cold. The back of the room is dry lined on concrete, the concrete is about 20-30cm thick and really tough, since it is also supporting two further floors of the same size room above us (rooms stick out the back of a 5 story terrace).
When I pulled off the plasterboard, I found that a total of six holes about 1 inch diam equ spaced across the wall in two rows of three, holes had a cardboard tube in them. Sadly, holes go straight to the outside, I can see the back of the building behind me through them. Looks like the back of our building (we can't access it nor see it due to arrangement of properties too complicated to explain here) was never properly finished, so all this time cold air has been moving into the dry lining void, no wonder we had some condensation problems on the plasterboard and the room was freezing!
I'll be putting mineral wool in between the batons and then vapour control layer and then plaster boarding it again. But of course I should fill the holes.
Question is: what with? Should I just plug it with concrete, expanding foam?
When I pulled off the plasterboard, I found that a total of six holes about 1 inch diam equ spaced across the wall in two rows of three, holes had a cardboard tube in them. Sadly, holes go straight to the outside, I can see the back of the building behind me through them. Looks like the back of our building (we can't access it nor see it due to arrangement of properties too complicated to explain here) was never properly finished, so all this time cold air has been moving into the dry lining void, no wonder we had some condensation problems on the plasterboard and the room was freezing!
I'll be putting mineral wool in between the batons and then vapour control layer and then plaster boarding it again. But of course I should fill the holes.
Question is: what with? Should I just plug it with concrete, expanding foam?
