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Author Topic: What to fill wall to minimize sound transmission  (Read 7465 times)

Nathan Riddle

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What to fill wall to minimize sound transmission
« on: December 22, 2016, 01:31:51 pm »

I have a client building a new wall between two spaces (one loud, one with preschoolers).

Yes, I asked them if they could place the kids room further away, but can't.

What is the best material(s) that can be placed inside a wall (fire retardent, cheap, meets inspections, etc).

I'm thinking some mass loaded vinyl to block any Mid/Highs, liquid nails for the cracks, and good thick fiberglass insulation. Also, thicker wall (2x6 not 2x4).
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Keith Broughton

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Re: What to fill wall to minimize sound transmission
« Reply #1 on: December 22, 2016, 02:32:38 pm »



I'm thinking some mass loaded vinyl to block any Mid/Highs, liquid nails for the cracks, and good thick fiberglass insulation. Also, thicker wall (2x6 not 2x4).
Seems like a good start.
The other thing to consider is sound damping inside the noisy (kids) room.
It helps to kill some of the sound before it gets to the walls.
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Hanno Meingast

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Re: What to fill wall to minimize sound transmission
« Reply #2 on: December 22, 2016, 02:36:38 pm »

Double wall   Two sets of plates. Offset studs. Extra layers of drywall. Fill with rock wool


Sent from my iPhone using Tapatalk.    Hanno
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Nathan Riddle

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Re: What to fill wall to minimize sound transmission
« Reply #3 on: December 22, 2016, 02:47:22 pm »

The other thing to consider is sound damping inside the noisy (kids) room.
It helps to kill some of the sound before it gets to the walls.

Good idea, they ran into issues with construction costing a good bit more than expected so that probably will have to come at a later date. The further issue is that the kids room has 48" walls instead of full walls. It is only separated by the louder youth room by a hallway and this new wall.

Thankfully, they are goign to try to stagger the loud portions of service in the youth room from the kids room. But still... going to be difficult to block sound.
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Nathan Riddle

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Re: What to fill wall to minimize sound transmission
« Reply #4 on: December 22, 2016, 02:50:53 pm »

Double wall   Two sets of plates. Offset studs. Extra layers of drywall. Fill with rock wool

So sheetrock, rock wool & stud, sheetrock; sheetrock rockwool & stud, sheetrock? So its two walls physically there?

Or stacked plates?
Or two plates and thicker wall filled with rockwool?

I assume the offset studs help to keep any resonances down within the wall?
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David Buckley

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Re: What to fill wall to minimize sound transmission
« Reply #5 on: December 22, 2016, 03:34:31 pm »

Here in NZ there is a kind of wall filler that is especially designed to reduce sound transmission, [linky]; you should have similar materials available in your jurisdiction.  There also a datasheet there which gives some guidance to how to do this and what results to expect.
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Cailen Waddell

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Re: What to fill wall to minimize sound transmission
« Reply #6 on: December 22, 2016, 04:15:32 pm »

In addition to staggered studs, I would use double layers of drywall, with green glue between layers on both sides of wall, as well as hanging drawl on resilient channel off the studs.  All wall penetrations should be sealed with acoustic sealing caulk. 


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Laurence Nefzger

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Re: What to fill wall to minimize sound transmission
« Reply #7 on: December 22, 2016, 04:51:25 pm »

In addition to staggered studs, I would use double layers of drywall, with green glue between layers on both sides of wall, as well as hanging drawl on resilient channel off the studs.  All wall penetrations should be sealed with acoustic sealing caulk. 


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I am assuming that the two spaces are totally enclosed?! I have been amazed in the past to see attempts made to "sound proof" a wall between two areas yet have a drop ceiling with a shared plenum space.
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Cailen Waddell

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Re: What to fill wall to minimize sound transmission
« Reply #8 on: December 22, 2016, 04:54:41 pm »

Right the wall has to go to the roof.


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Nathan Riddle

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Re: What to fill wall to minimize sound transmission
« Reply #9 on: December 22, 2016, 05:37:00 pm »

I am assuming that the two spaces are totally enclosed?! I have been amazed in the past to see attempts made to "sound proof" a wall between two areas yet have a drop ceiling with a shared plenum space.

Haha, that's great.

Yeah two story building, just filling in the space between floors.
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Re: What to fill wall to minimize sound transmission
« Reply #9 on: December 22, 2016, 05:37:00 pm »


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