I recently noticed that there was water damage at the top corner of an exterior facing wall in one of my bedrooms. Previously, I had thought it was electrical wiring in the wall due to the snake-like shape of the damage. This was over a year ago. However, when I looked at this corner again recently, the drywall has split open in some parts and I strongly believe it's water damage.
I'm going to try to get some qualified repair person to come in and assess the damage. I was wondering if this community has any advice for a first-time homeowner like myself on how to handle this issue. Should I contact my insurance? What kind of serious issues should I be on the look out for? How should I handle this issue if the source of the water leak is from the apartment above mine?