I live in a building that was built in the 1950s. Heating is by hot water. I live below the penthouse which has its own thermostat for temperature regulation. Whenever their heat comes on, pipes throughout ceiling and walls begin to tap or knock, somtimes rapidly, sometimes slowly but always too loudly. The landlord seems to think that the pipes are vibrating and knocking against the inner walls and ceiling. He claims to have tried everything to correct the problem, to no avail, having cut holes in the ceiling and walls to stabilize the pipes. When one area is secure, apparently, another area begins to vibrate with the rush of water in the pipes.
Is this accurate? Can nothing be done? Would bleeding the pipes to release trapped air fix the problem?