I purchased a home about eight months ago, where the seller had disclosed prior roof leakage. This leakage had occurred a few years before (around 2016). The home was a new build and the roof leak occurred shortly after manufacturing. The roof leak was supposedly addressed by the original builder or a sub-contractor. I presume the drywall would have been replaced as part of this work. Mold inspections done months afterward were all clear.
In any event, I’ve recently started removing wall paper from the room where the original leak occurred. Where the wall meets the ceiling, there is a small gray(ish) line that traverses most of the room. I had always thought this was just glue from the wallpaper.
Now that I have the wall paper coming down, I was hoping to see if someone might be able to confirm. The line is approximately a centimeter. Poking the area does appear to be slightly software than the rest of the walls. I suppose that could be indicative of glue or something designed to close drywall gaps? I also know it could be indicative of water.