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Sound isolation - dealing with HVAC ducts

OK, so I'm planning a room. It's a 15x30 basement room. Along the 30 foot length, there are is one HVAC duct on each side running along the ceiling with vents into the living room above. I have the ceiling pretty much figured out except how to deal with these ducts. I have other ventilation plans so I won't be using them. I just can't figure out for the life of me how to insulate them for sound isolation. I can't move or modify them.

Thanks in advance for any suggestions.


kmetal Sun, 01/09/2022 - 10:58

Hi and welcome!!

You will need to "box out" the ducts with a frame that is equal to the isolation your getting from the ceiling assembly. Essentially you "trace" around the ducts with your ceiling assembly, making sure to keep adequate clearance around them to avoid them physically touching.

This can be done a few ways.

If you detail your ceiling and wall construction I can probably be more specific.

I highly recommend "Build it like the Pros" by Rod Gervias. Aside from a wonderful general reference, it covers maintaining isolation around beams and ducts specifically, and includes drawings.