I just need to figure out how to salvage these.
James said the original backing is some sort of asbestos board. Best thing to do with it IMO is put it back. I can seal any loose edges and break lines.
You should check out that assemblly book even though I was bitching aboutthe quality. Can always borrow mine if you don't want to buy a copy. Shows almost where everything goes. Or should I write was supposed to go.