Never do floor test after hacking and
waterproofing work for the toilet.
Can complain to the HDB.
Ask the upstair owner to pay for the repair work.
Normally renovation contractor will give 1 yr warranty for the renovation work done.
In this case, it might be beneficial to open a dialogue with your neighbor about the issue and see if there can be a resolution or mitigation measures put in place. Additionally, involving your building management or landlord can help address the situation effectively.In the meantime, if you're looking for ways to deal with the mold problem or prevent it from spreading further, you can check out professionals who can
Kill mold. They offer valuable insights and solutions to tackle mold-related issues.I hope you find a swift resolution to the problem and can regain the use of your master bedroom and attached toilet soon.
Now, there are waterproof glue and also waterproof paint easily available.
Before laying the tiles, use waterproof paint. After laying tiles, use waterproof glue.