Northstar1

Yes, that’s the problem with condos, at least you have an empty unit below and are able to inspect and do your do diligence. Capping filling testing etc will be the most you can do, remember drainage will (should) only be 1/4 to 1/3 full during everyday use, no pressure, unless clogged. drainage pipe generally is the least of your worries in regards to leaks if installed correctly wTer pipe is always under pressure and is more likely to leak over time. correct grade on drainage is important as to carry waste , solids , and not leave anything in the pipe after use

I’m a plumber, testing piping is simple, he should have the pipes connected to the fixture and it should be valved coming out the wall before the fixture. EVERY fixture should have a shut off valve so you don’t need to shut the whole house down when trouble arises. simply turn the water on before the walls are enclosed and visible. Making sure off course all valves are off. I’m certain any plumber would do this to avoid floods. But it is Thailand ???? Ask the project manager to make sure pressure piping has been tested drainage pipe is simply capped, filled and visual checked. no pressure will be present in drainage with every day use! good luck! Nice to see you got a warranty ????

Well said, far more opportunities in the west, yes there are bad places in both countries, but I don’t live there. my hometown is clean , safe, affordable, quiet, no one running around with guns, yes, quite happy!