I have a 1930s house with really, really bad walls. Around here the walls just crumble if you try to put nails into them, apparently something to do with the high sand content used for buildings in this area or something. On top of that they are covered in woodchip wallpaper, which has been painted over multiple times. Naturally I'd love to get rid of it, but I think taking it all down and re-plastering the walls likely to be very expensive and extremely messy. We will be living there while the work is done. Is there any better option in terms of cost and/or disruption? Plasterboard over the top might bring the whole lot down I think. I've seen special thick wallpapers but am sceptical.