The most common question asked of our reps is "how do I know it's fitted right?" The answer is simple, it won't look like this . Poorly fitted insulation, with lack of proper ventilation, will lead to moisture build up in rooms causing mildew if not sorted properly. In this case, the room was ventilated and the insulation refitted around the edges. The ceiling was then washed down with anti mould cleaner and left to dry before repainting when the room has dried completely.