Hey ppl, Seeking for some advices. Previously when I got my new place, My neighbour at the unit above me had the toilet water-proofing problem and caused some water stains on my ceiling. I informed HDB and the problem was solved with goodwill by them as I got my unit from them for just a few months then. Then I believe the ex owners sold their unit to someone new or carried out a major renovation. There were hacking work done last month and currently, their renovation work is in the final phrase (Painting and touching up). Yesterday I got a shock when I discovered that there were alot of water stains on my ceiling which wasn't there previously. It spreaded from the kitchen (Toilet area) to my master bedroom, guest room and living room. Also apalled to find cracks on the ceiling of my guestroom, living room and light box. My unit just completed it's renovation in feb this year and everything was in good condition with a fresh coat of paint prior to these. Believe they drilled too deep when they were doing the hacking and as while they were carrying out their job, I actually notice my down lights slightly displaced from it's slots and I had to push it back. I called up the contractor and told him about it and he mentioned that he will send someone down this evening to take a look. I had also reflected the matter to HDB as I wanna keep a record of what happened. The Technical officer from HDB told me that he would be issuing in writing to the Contractor and get them to revert to me. I was thinking if anyone can advise what other stuffs that I should look out for when confronting the contractor tonight as I understand such water stain problem can be recurring if the water proofing work was not done properly and the crappy part is, they had laid the new tiles when I went up to see yesterday. It's a headache and I just hope that all these can be solved once and for all sighz.