Hello People, I'm trying to fix a TV bracket to the side wall of a Dormer window. It is lined with what appears to be Celotex. As can be seen from the photos I have drilled into the plasterboard at regular intervals but have not hit any wood. The property is about 10 years old. Can anyone suggest how else it might have been constructed if not with Studs? Photos to follow as I've just discovered that they are too large...
