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#990196 - 08/18/05 10:08 PM Damping ductwork
hthaller
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Registered: 08/06/05
Posts: 9
Loc: Hamilton,, New York

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I'm looking for suggestions to deal with galvanized sheet metal HVAC ductwork. Are there any quick and dirty ways to deal with this in a basement setting?
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#990197 - 08/20/05 05:08 PM Re: Damping ductwork
bdbklyn Moderator
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Registered: 04/04/01
Posts: 1035
Loc: Los Angeles,CA,UNITED STATES

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On the interior they are usually lined with rockwool. There is a product. Although i don't remember the name that are 1/16" thick 12" x 24 " sheets. It was very effective and I believe manufactured by 3M. i googled it and couldn't find it. maybe there is a contractor lurking about who can enlighten us.

Bill
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#990198 - 08/22/05 12:07 PM Re: Damping ductwork
bdbklyn Moderator
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Registered: 04/04/01
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Loc: Los Angeles,CA,UNITED STATES

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The brand name Celotex keeps sticking in my bead but internet searches are not turning up the product I remember. If prevented exposed metal duct work from pinging and resonating.


Bill Dooley
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#990199 - 08/24/05 08:19 AM Re: Damping ductwork
Jazzman
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Registered: 08/15/01
Posts: 1409
Loc: ,,Hartland MI,USA

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Basement ductwork can be nasty to fix. There are many things affecting the noise you hear.

1. Ductwork is usually attached to the floor joist above. This can be an issue if the floor above moves when walking on it creating a popping sound on the ductwork running across the joists. The contractor usually breaks the ductwork to stiffen it(like a big X across the ductwork section). The reason it pops is because the duct is connected to the joists with no room to move. In addition the length is also fixed, so when the duct needs to flex it has nowhere to go and then pops. I would loosen up the duct and creat a 1/4" space between the duct and the joists.

2. Another issue is that when the duct heats up you hear a popping sound. What happens here is that the duct is expanding in all directions. The duct being tight up against the joists does not help for expansion. In addition in long runs the duct length will also creek with noise, because it wants to grow from the heat but is fixed solid to the joists.

If you can relieve the attachment to creat a space between the duct and the joists, add flex connections in long lenths of duct. Remove hard round duct sections(tak-offs) for flexible insulated ductwork, and line all corners internally in changes in direction, will reduce the noise levels to the studio.

Also having insulation on the outside will also help. Insulating between the joists will also remove unwanted noise on the floors.

I have all of these issues that I plan on adressing for my studio that I am now in the process of building.

Hope this helps.

Jazzman
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#990200 - 08/24/05 09:14 PM Re: Damping ductwork
hthaller
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Registered: 08/06/05
Posts: 9
Loc: Hamilton,, New York

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Great ideas. Thanks to all!
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