I bought this 1975 Slump block home 18 months ago. I been noticing in the living room ceiling. My ceiling boards are starting to show their imprint through the drywall. Also around the top of the walls and ceiling. I see nail heads starting to show through. Its like one day there is nothing to see than I will look and there they are showing. Should I worry about my ceiling falling down.
Re: Ceiling Boards
I'm kind of thinking you might be describing something that's called ghosting.
Use the search function here by typing in "ghosting" to find other threads on this topic.