Now I'm taking over this thread.
I've been living for some years in an old cottage that we are renovating. It's been quite cold on the floors during winters, and the other day we came to the realization of how little insulation we actually have.
When we took down the wallpaper, it immediately became very cold. Then I found a rotten part of the wall that I needed to address, so I had to make a hole and witness the disaster.
Our walls consist only of paneling, tar paper, 50mm (sparse) timber, beadboard, and wallpaper.
Between the paneling and the timber, there's a 45mm air gap. I'm considering whether it's worthwhile to insert 45mm cellulose insulation there, wind barrier and battens on the outside, and then a new façade. This would move the façade out by about 30mm.
Is it too modest to only insulate with 45mm?
We live here year-round and, as mentioned, have found it a bit cold and drafty in the winters, but nothing extremely suffering. We have underfloor heating throughout the house.
The upstairs has been completely renovated by me some years ago. There is 200mm insulation in the walls and 400mm in the roof. It's comfortable with a well-insulated house, but it also becomes very enclosed and tight. The downstairs has been colder but also fresher because it's so drafty. I don't want to completely eliminate the natural ventilation, but I also don't want to live in the cold.
What's a reasonable compromise?
