
Brett Evans
new houses tend to use a TGI or similar joist which tends to flex/bounce more under weight. If you can see the ceiling underneath the floor in question move when someone walks into the room this will be the problem. Its not easy to remedy but I've known people to remove carpets screw all the floorboards down tight ti form a more solid structure and test again. Failing this you made need to counter batten over it and re-board using tongue and groove floor boards screwed and glued, they are probably the same type you already have.