I live in an apt and sometimes here banging or intermittent hammering. It sounds like it is coming from the apt below me. My neighbor complains of the banging as well and it sounds like it is coming from above him. I was told that the pipes are in the walls, and not in the floors, that the floors are concrete. Is it possible for the sound to still be the pipes and because of the way that the sound travels that it sound like its coming from above or below (depending on which apt you are in). If not, do you have any other suggestions at what might be causing the noises since it is neither of us? (Our heat is electric) This is causing many problems b/c our neighbor believes that it is us stomping on the floor and calls the landlord regularly.
You are probably talking about a banging sound coming out of the radiators. The pipes are in the wall and it could be water trapped in the pipe that is in both your apartment and the neighbor above you, and everyone else in the same line of apartments. It could also be the main needs to be vented. Mention it to your super and if he can't fix it have him call a heating specialist.