rhythmic tapping in wall?

Loud Ticking, Popping, Tapping & Creaking Sound in the Wall – Neighbor’s Water Heater Exhaust Flue

A repetitive ticking or clicking sound coming from walls and ceilings can result from the expansion and contraction of metal HVAC ductwork that conducts ventilation through these voids. When metal heats up, it expands; when the furnace stops pushing warm air through the system, the metal cools and contracts.

Hearing Sounds in Your Walls or Attic? This is Probably what it is!

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