We recently bought a 25 year old house. It uses gas heat. When it got cold and the heat came on I noticed a very loud cracking sound when the heat came on and again when it turned off. This is from the expansion and contracting of the galvanized heating ducts in the basement. The ducts are on metal hangers so they are not touching the floor joists.
I have never encountered this problem in any other house I have lived in. How to best fix this? Someone suggested putting a strip of plastic vapor barrier between the hanger and the duct to allow slippage. Couldn't that be a fire hazard?
_______ Free Windows Clipboard Utility