I am new to the forum and looking for some advice.
I recently acquired an old house whose walls are 55 cm thick, the house is on 3 floors. The previous owner has had double glazing installed on almost all levels. I am working on the insulation of the roof which needs to be redone (over 30 years). The house is currently ventilated in a natural way (you can really feel the drafts). I am going to finish installing double glazing and all this will help to strengthen the seal. I don't intend to insulate the walls because I read that on these old houses, it was not necessarily a good idea because they "breathe", moreover I can only insulate from the inside. Here it is, it is to paint the picture.
My question is about ventilation. I would like to install a double flow vmc and I read that it was necessary to extract the air by the humid rooms and to renew it by the dry rooms. The problem is that I don't have wet rooms on the top floor, there are only rooms. Should I still place an extractor on this level (in the small hall formed by the arrival of the staircase for example)? Are passageways like stairs to be ventilated and in what direction?
Thank you in advance for your precious advice.
