We have a pitched roof (1971 house, The Netherlands) which consists of (outside to inside):
- 2cm PUR insulation
- 2cm wood
We asked a few companies for quotations to improve the insulation (currently Rc=0.8).
Company 1 is suggesting to add rockwool to the inside, while company 2 says that any insulation on the inside will lead to condensation issues.
Are there any options for adding insulation on the inside of the roof in this case?