Soundproofing Forum Topics > Sound Control for a dog and other animals like birds

Soundproofing panned joist return?


We have a cold air return that goes from the first floor to the basement through a panned joist (just a piece of sheet metal nailed over two joists). There are loud birds on the first floor, and we are trying to stop the sound coming down from the air return into the basement. What would be the best approach?

I was thinking of loosely covering the two joists with MLV / acoustical barrier from below. Would that work? Or should I put some sort of foam insulation over the duct first, then put the MLV over that? Any other ideas?


Randy S:
Line the entire cavity with our foam mat, at least 1/2" thick and the pan.

before putting the metal with foam back up you want to put a few blocks of foam glued in creating a series of 90* turns.

You are making a baffle box.

when the metal goes back up you can cap it with 1/2" hardie backer cement board.

feel free to call me direct if you have questions.

Randy S.

This is great information, thank you!


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