The heating system has always been noisy. Since replacing the furnace, a noisy tapping sound can be heard in two of the bedrooms. It begins when the furnace begins the heating cycle and is heard continuously throughout the cycle. The contractor says the builder forced a round pipe through a wall rather than use a rectangular duct. The resulting tapping sound is from the expansion of the and there was little could be done other than ripping apart walls and installing the proper ductwork - a solution that he said would likely be too costly to remedy the situation.
Answer:
You might want to zero in more on precisely where the ticking is taking place and you won't have a whole lot to dismantle to correct it. In situations like this, it's normal to have the ticking start where the house changes from one level to another. Because you say it starts when the heating cycle starts, it could even be that it's accessible from the basement without having to take anything apart.
