I have a terrace outside our bedroom, where over a section corresponding to the bedroom's measurements on the inside of the wall, I built a roof with 10 mm insulating plastic about 12-14 years ago. Now, in my later years, I've started to get annoyed by the drumming on the roof when it rains, especially during heavier showers. (If I were to build it today, I wouldn't have chosen a plastic roof but instead used tiles since I don't need plastic for light admission.) I am therefore considering installing OSB boards on the underside, possibly with insulation between them and the plastic. What do you think of this method?
If you are going to add insulation, you need an air gap between it and the polycarbonate, as well as ventilation options. There can be quite significant temperature differences there, so the problems should not be underestimated. Additionally, polycarbonate roofs have a tendency to leak over time.
Isn't it a better solution to remove the polycarbonate and install a felt roof instead?
Isn't it a better solution to remove the polycarbonate and install a felt roof instead?