Author Topic: shared floor joist cavity between units  (Read 3509 times)

lathandplaster

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shared floor joist cavity between units
« on: January 13, 2011, 11:10:50 PM »
The second floor of my 100-year-old home shares floor joists with the adjacent attached house. There is nothing blocking the air cavities between each set of joists between units. The result is both impact noise, I assume carried through the joists, and airborne noise, I assume transmitted vi the shared airspace beneath both our floors.

What is the best solution to deal with this noise? It's the airborne noise -- voices, dog barking -- that bothers me the most. Is there a form of acoustic insulation that can be injected through a hole in the floor? Any other ideas?

Randy S

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Re: shared floor joist cavity between units
« Reply #1 on: January 17, 2011, 05:32:00 PM »
blown in insulation will do minimal reduction. You will need to open the ceiling up and install insulation, MLV and I would advise clips and channel followed by double 5/8" drywall with green glue sandwiched in between.
 
Randy Sieg

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lathandplaster

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Re: shared floor joist cavity between units
« Reply #2 on: January 24, 2011, 03:58:14 PM »
Thanks, Randy. I am debating whether to go at this through the ceiling below or the floor above. The ceiling is dropped so I'm not sure what I'll find when I open it up. The floor is an old plank subfloor that has been refinished.

If I open the floor and then put down a new plywood subfloor and either carpet or hardwood on top, will that significantly add to the sound reduction from either airborne (via the open cavities) or joist-borne noise? And would you recommend any other floor layers (ie, MLV or foam padding) to help reduce noise?

Randy S

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Re: shared floor joist cavity between units
« Reply #3 on: January 24, 2011, 04:32:01 PM »
Lath and Plaster, the answer would be NO, because you would still be nailing into the structure. You would achieve some airborne reduction but not impact.

When you have a chance give me a call directly and we can go through basic principles

Randy S.

760-752-3030 ext 104
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

 

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