Even on a mildly windy day, the new metal chimney surround makes a banging sound. The wind pushes the side in-and-out, which causes a sound like a drum. Is there any type of brace, support or liner that the contractor can install to prevent the sides from being indented and springing back into place? Thanks for the help.
Lowel W. ~ Minneapolis, Minnesota
Lowel, I do not know what type of metal chimney has been installed on top of your house, but if the metal can flex just from the pressure of a mild breeze, then I would guess that you are describing a lightweight aluminum stove pipe that is probably only venting a gas fire place. There are stiffer metal stove pipes available, such as the double and triple walled models used for wood stoves, that can withstand the force of even strong winds and should not create the noise problems that you are currently experiencing. Of course, installing a new stronger chimney pipe would cost you more money, and the current stove pipe would have to be removed and discarded.
Another option would be to have a metal collar custom fabricated that could be riveted onto the existing chimney pipe and would protect it from the wind. Although this too would cost you some money, at least you would not have to replace the existing stove pipe. I would consult a contractor in the Minneapolis area who installs metal chimneys and can inspect the stove pipe on your roof and offer some suggestions about how best to reinforce it. There may also be a standard-sized metal brace available that can help support your metal stove pipe and protect it from snow and wind. Good luck with the fix, and I hope that you can put an end to your noisy chimney.