Why Does Sheet Metal Make Noise

The noises are usually caused when the thin sheet metal of the ductwork expands to accommodate the sudden change in pressure caused by the airflow.

Why does sheet metal make noise.

That wobbling causes the sound waves to move differently in the sheet giving the wobbly wub wub sound. However if you take a sheet of metal which isn t tightly stretched and wham it it starts to wobble freely. Installing a metal roof over a solid deck with a good underlayment like double bubble and with an insulated attic airspace below makes it easy to control the noise. Years ago as a young builder i almost got blown off a roof while trying to carry a sheet of 4 by 8 plywood.

If your roof is installed without a proper roof underlayment you will experience the kind of noise that causes people to think buying a metal roof is a bad idea. A thick and strong metal can withstand more pressure therefore making it less likely to expand which reduces the popping noises. Amplified within the thin sheet metal enclosure of the ductwork this noise usually seems louder than it actually is. When following these tips some say their metal roof is even quieter than their old shingle roof.

As ducts age the sealing fails and duct connections wiggle loose from the static pressure. Installing an underlayment between the metal roofing and the roof sheathing is a key step to reducing metal roof noise. A sudden wind gust knocked me down and the plywood sheet went sailing out of my hands. This is a step that must be taken during the installation process.

The lower the gauge rating the thicker and stronger the metal. To relieve this stress the sheet metal buckles slightly outward making a booming or banging sound. Rattling noises are often the result of loose metal ducts knocking against each other. Following are common duct noises and what may be causing the problem.

Duct sheet metal may cause all sorts of noises from one or several different reasons. If every time you turn on the heating or cooling system the air ducts start popping and banging read the rest of this article for tips on how to reduce and even stop the noise entirely. While all hvac systems make some noise when they are on when there is excessive noise such as popping knocking and banging it can indicate a problem.