One of our home's walls is solid (the remainder are cavity and filled). We are thinking about insulating this solid wall internally and see three options on how to do this however which is the most common solution?
1. Screw battens to the wall and then fix PIR backed plasterboard to these. [Do we risk the battens rotting after some time? What thickness of PIR would be recommended?]
2. Create a stud wall away from the existing solid wall and then insulate this? [Will 100mm mineral wool suffice in between the studs?]
3. Fix PIR backed plasterboard with adhesive. [Would we need to remove the existing plaster which is held firmly, about 1/3rd of it has already come off which does make the walls fairly unlevel?]
1. Screw battens to the wall and then fix PIR backed plasterboard to these. [Do we risk the battens rotting after some time? What thickness of PIR would be recommended?]
2. Create a stud wall away from the existing solid wall and then insulate this? [Will 100mm mineral wool suffice in between the studs?]
3. Fix PIR backed plasterboard with adhesive. [Would we need to remove the existing plaster which is held firmly, about 1/3rd of it has already come off which does make the walls fairly unlevel?]