I just bought a new construction house (2020) in Wisconsin a week ago and we have already found 3 leaks In the guest bathrooms. The upstairs bathtub drain leaks with standing water and more when it is being drained. And it leaks onto the ceiling of the bathroom directly below it in the basement. Come to find out that the bathtub downstairs does the same thing. Called the builder and he got back to me after a day and had me (which I thought was weird that I had to call) call the plumbers( who did the work). Plumber came out next day to find out that It appears someone came in after and put in new black drains and fixtures when they think they put in chrome. As he took the drains apart found that the white PVC drain elbow was stripped/cross threaded and there was both clear silicone from when they installed the first time and then some white silicone put over top of the previous silicone. Which he claims to to have been the problem And then told me that the elbow should be replaced because of the stripped/cross threaded threads. Which they would have to cut a hole in the Sheetrock in the hallway to access. He thinks the builder came in and did it because he was rushing to finish the project and have it on the market. But called his master plumber and the builder and decided to just remove all the old silicone and put new silicone and not replace the elbow which is stripped. Tested it and seemed to not leak. only did the basement one as you can test and see from a crawl space whether it leaked or not.

my concern Is that this is a cheap fix and will likely leak again down the road. Is this okay or should I ask for them to replace the elbow and do it properly? Which is what I would like them to do For peace of mind. We only have a 1 year builder warranty on the house as well Since Wisconsin builder can choose to provide one or not. Thanks in advance.