I bought a flat in an old building (55 years old), and fully renovated.
During the recent typhoon, I saw water leaking in (saw mark at corner of the window).
I complained to the renovator, and he added "waterproof membrane" surrounding the window area.
Recently during a somewhat heavy rain, I saw the water leaking again.
I complained to the renovator once again, and he said it might be because the building structure is weak, probably due to age.
He brought in a technician (who claims to be authorized by Buildings Department), used "humidity meter" throughout the house, and there are two issues:
1. There seems to be "unseen" leakage from upstairs. Not-yet-problematic parts of the ceiling have high humidity reading, indicating leakage from upstairs.
2. In terms of the water leakage from window: because building is not covered with tiles, water can get absorbed through concrete from the building roof, come down and leak through potential weak points of flat wall. (window is adjacent to structural pillar)
I consulted a bit, and the recommendations were:
For issue number 1: that is upstairs' responsibility to fix/compensate for damages. If they are not willing to fix it, I can hire surveyor (10-20k), get report, go to court, and force them to fix.
For issue number 2: I have to talk to management office/incororated owners.
I have talked to my insurance company, and they said they are able to hire a surveyor for me (I just have to bear 1k of the cost).
What I am curious is... am I able to "force" the management office/incorporated owners to take any action on weak building structure? I want them to take at least some action (i.e., add waterproof layer to the roof of the building, which doesn't seem to cost much)
The leakage is not too big (about 100ml water leak per heavy rain) so I suppose I can leave a towel in the corner of the window, but it is surely annoying.