OK, total rookie question.
This stuff is throughout our 100 year house. It feel like plaster, but it many (too many) spots the enire "sheet" moves if you push on it- like a drywall sheet would. But it's plaster, with some sort of hair in it. Nails go in it like plaster, but I thought plaster was "smeared" onto walls, and then locked into the lathe. I can't find any place where there appear to be keys.
How do we repair this? There are some walls that are going to have to come down or be drywalled over, but some areas just have a ding or crack to be fixed. Thanks.
ps- going to go join a place to get theses photos in....