When I ripped down all the walls I discovered the ductwork was barely held together, and when they'd finished the basement, it wasn't just the electrical work that they did a horrible job on. Most of the new ducts that were added on were barely connected, and the standard duct tape that they'd wrapped around to fix the gaps had dried out and wasn't doing any good.
I'd used the proper metal tape on the joints between the 6" diameter ductwork, but for the connections to the main duct, that wasn't really feasible - so I used mastic and fiberglass mesh tape to seal up the gaps. In some cases, I had to screw the 6" elbows into the main duct as well to secure them.
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| before - with some nice gaps. |
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| Some mesh tape added where the biggest gaps are. |
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| Smearing on the mastic via gloves. |
So far, sealing up all the gaps seems to have helped. Although it hasn't really been that cold to test out. It definitely won't hurt things.
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