Why is our toilet drain pipe so incredibly loud?
October 26, 2012 1:20 PM Subscribe
Plumbing filter: Why is there an incredibly loud noise on the first floor when the second floor toilet is flushed, and can this be fixed?
posted by Mallenroh to home & garden (13 answers total)
Our house was built in 1999. If you are in the guest room downstairs and someone flushes the upstairs toilet, there is a *very* loud sound of water rushing behind the guest room wall. It's like standing next to a thundering waterfall - this isn't like a faint sound of hearing a flush in a distant room or water trickling in a pipe. Obviously the drain pipe from the toilet must go through this wall, but I have lived in other 2-story houses before where this was not an issue. It is not ideal to have guests staying in the guest room and worry about waking them up via toilet flush from the 2nd floor (it really is abnormally, alarmingly loud). I haven't seen evidence of water leakage so it seems like it's not so much that something is broken, but rather was poorly implemented to begin with.
Can this be fixed by replacing the drain pipe with something quieter? Insulating it somehow? It wouldn't surprise me if the issue came down to the builders using cheap materials in the first place; we have already found instances where ducts from the HVAC system open up into cabinets (instead of vents) and it generally seems like the developers cut corners during construction.