Hi, I am afraid, I made a mistake that i have to correct now. I built up an extension for a kitchen of 5.5x6 metres last year and put a cold roof on it. insulation on the ceiling, all over the place a gap between 100 and 400 mm ( pitched roof ), decking boards from 18mm OSB, fibreglass roof. So far everything is fine, no leaking, no problems. BUT : I noticed that when it was cold I had ice under the OSB boards. If then the ice melts it dropped on my insulation. My trouble now is, can i just build up my warm roof construction on the old roof without removing the fibreglass( this was done last year in spring, the roof is really ok ) but i am feeling more safe with the warm roof construction. However, I know i have to spend money for new insulation and new fibreglass. Only Problem is, can I leave it like it is and start the new one from here, can I leave the insulation on the ceiling? Hope there is anyone to advise me. Thanks for help