Author Topic: Soundproofing between units (shared concrete wall)  (Read 1976 times)

carpetcrawler

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Soundproofing between units (shared concrete wall)
« on: November 30, 2015, 01:53:40 PM »
Hello

Looking for advice on how to soundproof between neighboring units.  The main sound penetration is a barking dog from side neighbor. No neighbor above. 
These are 2 story condo units with a shared concrete wall (assuming it to be about 4 inches thick).  In the upstairs floor, there is a 1 foot gap between the drywall ceiling and floor above where power/hvac/drain pipes run.   It appears that there is a common drain pipe that runs between units horizontally, through the concrete walls.   I think the rest of the pipes only run in vertical stacks up and down. There is no insulation in that space currently, just 1/2 inch gypsum.

My guess is that the sound is travelling via the pipe through the concrete wall and down through the ceiling. I don't think a dogs barking could penetrate a concrete wall without some sort of gap or flanking through pipes.

Would there be any use in:

1)wrapping the pipe from where it enters my unit with insulation or lagging? If so what is a good product?
2)putting acoustical insulation (eg. Roxul)above the drywall ceiling to try and reduce noise transmission from the pipe above?

Any other suggestions?    The ceiling is already low so I don't have the option really of doing a 2nd layer of gypsum with green glue etc.
Thanks

carpetcrawler

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Re: Soundproofing between units (shared concrete wall)
« Reply #1 on: November 30, 2015, 06:05:10 PM »
I wanted to add that it has only been since the one neighbor got a dog that I've had sound issues in the buidling.  Prior to that, the only sounds I'd hear would be if someone slammed a door or dropped something heavy on the floor etc.   No issues with talking/tv/daily living sounds

I thought maybe the sound from the barking was coming through their condo door, down the hall and in through my door, but since I can hear it more on the 2nd floor, I think it's likely coming more through shared wall/pipes.

Randy S

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Re: Soundproofing between units (shared concrete wall)
« Reply #2 on: November 30, 2015, 10:08:26 PM »
You can wrap the pipe with our mass loaded vinyl w/ closed cell foam. This works really well.
http://www.supersoundproofingsales.com/Mass-Loaded-Vinyl-48W-w_Closed-Cell-per-foot/productinfo/09-00005CC-54F/
Absolutely add insulation where you can.

Now for the bad news...I have had dogs barking in kennels penetrate 12" of brick next to a lawyers office.

So we can try the Band-aid first and see if that gets you some reduction, if that does not do the job you are going to need to contact me direct to assess the entire assembly.

Randy S.
760-752-3030
Randy Sieg

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

carpetcrawler

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Re: Soundproofing between units (shared concrete wall)
« Reply #3 on: December 01, 2015, 01:55:06 PM »
Thanks Randy for the reply -

A few follow-up questions:

1)Is that material available in any national stores, or only through your company?  I ask because I think it would be very expensive to ship (based on the fact the drain pipe is probably 4-5" in diameter and 15' long).

2)If I cant get my hands on that MLV, would foam help at all for noise reduction?

3)Can we just lay the roxul on top of the drywall ceiling between the studs, or does it have to be affixed to the studs (metal) or concrete deck above?

Thanks

Randy S

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Re: Soundproofing between units (shared concrete wall)
« Reply #4 on: December 01, 2015, 10:39:36 PM »
The product will not be available in national stores but you only need 6 linear feet to do the whole job.

Certain pipe insulation like we carry will do some reduction but not as good as the barrier composite.
and it has a wall thickness of 1" and can be an issue for space in the wall.

You can just lay the insulation in the cavity.

Randy S.
760-752-3030 ext 3095
Randy Sieg

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