Do my old walls 'remember' the leaks?
My house was built in 1935. Most of the walls and ceilings are a plaster board coated with two coats of plaster, kind of a precursor to drywall.
About 8 years ago, we had a leak in our upstairs bathroom that damaged the kitchen ceiling below. Later, we remodeled the bathroom and haven't had any obvious leaks since. About 3 years ago we remodeled the kitchen and had the ceiling damage repaired so that it looked like new.
Recently, I've noticed the plaster in the same area starting to bubble and crack. I opened the access panel to the tub and didn't see any obvious signs of water. Am I missing the leak? What else could be causing damage in the same area? Because, I'm having the same issue in a bedroom wall behind the chimney, where we had water coming in years ago and finally had it repaired recently, I'm beginning to wonder if it has to do with the wall board rather than an ongoing leak.