Ductwork noise


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Old 01-25-19, 04:10 PM
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Ductwork noise

This noise is driving me crazy. There is a loud tick sound that comes from my ductwork when the heat is on. So I ripped open the ceiling to take a look. Does anyone know what this is or how to fix it? See the video at 9 secs, 17 secs and 28 secs to hear the loud snap. Youtube link, turn volume up: youtu.be/lraDKY3hWAE

I added rubber spacer like this because I thought it was hitting the wood but there is little change in the sound. (Attached Image)
 
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Old 01-25-19, 05:24 PM
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So this is similar to when a tub of hot water is drained and the drain pipe expands due to the heat and rubs against the floor joists.

Heat ducts are same, when heat comes on, they get warm, expand and rub, then cool down and rub.

Just going to have to get down there when furnace starts up and track the noise down!
 
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Old 01-25-19, 06:15 PM
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I tracked it down and it's coming from that vertical 2x4 I think. I just don't know what to do cause the duct work is jammed against the 2x4. I put the rubber spacer in but nothing happened Do you think it's the wood or the duct itself?
 
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Old 01-26-19, 01:39 AM
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Probably the duct, metal will shrink and expand faster to differences in temp than wood so it touching somewhere!
 
 

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