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Soundproofing Common Walls?

 
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Old 05-13-2017, 07:46 PM   #1
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Soundproofing Common Walls?


i've been building duplexes lately and this is how the common wall is currently being done.
double 2x4 wall spaced 1" apart
1/2" fiber board panels in between walls
5/8" drywall on each outer side of wall
roxul insulation between studs.

these are single story buildings on concrete slabs.
while this wall construction works ok for sound control, i have heard a few people mentioning they could sometimes hear their neighbor or their alarm clock.
how could i improve the common wall?
i was thinking perhaps a layer of mass loaded vinyl down between the studs. or perhaps double drywall. but that green glue gets mixed reviews and is pricey.
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Old 05-13-2017, 08:59 PM   #2
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Re: Soundproofing Common Walls?


Not a framer, but I have seen a 2x6 plated wall with 2x4 studs alternated per side every other one, with the drywall sealed to the studs with acoustic sealant.

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Old 05-13-2017, 09:02 PM   #3
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Re: Soundproofing Common Walls?


Add soundbar under the drywall and double the 5/8
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Old 05-13-2017, 09:06 PM   #4
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Re: Soundproofing Common Walls?


I don't know the answer, but when I've worked in some townhomes, I've heard stuff like the neighbor's incessant yappy dog through the common wall in the master bedroom. Wth? It seemed to be piping in through receptacle boxes, only mildly muffled. I would lose my mind in a place like that.
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Old 05-13-2017, 09:37 PM   #5
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Re: Soundproofing Common Walls?


We found that foam open celled reduces sound transmission better than anything else we tried.
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Old 05-13-2017, 10:15 PM   #6
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Re: Soundproofing Common Walls?


Quote:
Originally Posted by 3bar View Post
i've been building duplexes lately and this is how the common wall is currently being done.
double 2x4 wall spaced 1" apart
1/2" fiber board panels in between walls
5/8" drywall on each outer side of wall
roxul insulation between studs.

these are single story buildings on concrete slabs.
while this wall construction works ok for sound control, i have heard a few people mentioning they could sometimes hear their neighbor or their alarm clock.
how could i improve the common wall?
i was thinking perhaps a layer of mass loaded vinyl down between the studs. or perhaps double drywall. but that green glue gets mixed reviews and is pricey.

A major part of this isnt the assembly but the penetrations and leaks. Are you sealing mechanical penetrations on party walls? Are you acoustical caulking the framing at floor, ceiling, wall?

If these are single story the sound could be coming through the ceiling and through the roof system into the next apartment..?

Curious to hear what the pros say. I just finished a masters of architecture thesis project about sound+design and I'm geeky about it, but not a pro.
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Old 05-15-2017, 04:12 PM   #7
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Re: Soundproofing Common Walls?


Where plugs are on that wall build a 2ftx2ft box made out of 2x3's and nail 5/8 drywall on the back side. Just hand them to your electrician to nail on where his plugs will be. Helps with sound and fire

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Old 05-15-2017, 04:14 PM   #8
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Re: Soundproofing Common Walls?


Quote:
Originally Posted by Mr.joe View Post
Where plugs are on that wall build a 2ftx2ft box made out of 2x3's and nail 5/8 drywall on the back side. Just hand them to your electrician to nail on where his plugs will be. Helps with sound and fire

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Sorry meant 20"x20" box


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Old 05-15-2017, 04:15 PM   #9
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Re: Soundproofing Common Walls?


Quote:
Originally Posted by Mr.joe View Post
Sorry meant 20"x20" box


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12x12" ughh cant type today. Stupid auto correct

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Old 05-16-2017, 12:21 AM   #10
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Re: Soundproofing Common Walls?


to be honest, the outlet boxes were not sealed. and since the concrete wasnt exactly even, there may be gaps under the wall.

i think i may run a single layer of 5/8 drywall down in between the walls, even though from reading online, this is a triple leaf effect and should be avoided.....
also, tempted to double up drywall on one side at least. perhaps with quitrock, at least in the bedroom, since they are back to back.
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Old 05-16-2017, 04:39 AM   #11
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Re: Soundproofing Common Walls?


440 Soundboard.

Good stuff.

http://www.homasote.com/products/440-soundbarrier
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Old 05-16-2017, 05:48 AM   #12
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Re: Soundproofing Common Walls?


I did one separating the office from a party room in a restaurant with a dance floor using 2x6 top and bottom plates and staggered 2x4 24" OC without any insulation and it muffled the sound in the office pretty good with DJ on the other side.
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