Author Topic: Questions about double walls and floor  (Read 2884 times)

Lil Dragon

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Questions about double walls and floor
« on: November 27, 2012, 09:45:22 PM »
Hello! I'm new to this forum and have found some great info here!  I am planning to soundproof the walls adjacent to our neighbors in a home I'm closing on soon.  The walls I need to soundproof are poured concrete with paneling over them. I'm not sure of how the paneling is attached yet, and each wall has a small plate glass window. I plan to seal off the windows, and build a double wall with double sheetrock on each side, green glue between sheets, resilient channel on the wall facing into the room, and clips for the channel. Here's my basic plan, with my questions:

1. Fill window cavity with roxul insulation and cover with 5/8 drywall, and seal around the patch with acoustic sealant.
        -should I remove the plate glass window and install glass block, considering I won't really be able to fix a broken window from the inside after the walls are soundproofed?
       -should I double up on the drywall over the window? Or how about MDF then drywall? Or something totally different?
2.  Leave some space, then build a double wall.  Both walls to have Roxul or other insulation, double drywall with green glue between layers, and resilient channel with clips on the wall facing into the room.
       -how far from the original concrete wall should I put the first of the double walls? I have 4ft or so to work with total. (there is a bathroom 4' from the concrete wall) In turn, how much space should I have between the double walls?
       -should I fill the space between the concrete wall and first double wall, and between the double walls with insulation, or leave an air space? The framed double walls themselves will be insulated.
       -should I use some kind of product between the bottom plate and the floor, and between the top plate and the ceiling joists to de-couple them? I have seen the tape, and read about people using green glue in this application, but I don't know if it's necessary or not.
       -should I stagger the studs on the double walls, or will that even matter as they won't be touching?

I'm sure there's quite a bit I'm missing here....but that's just as far as I am with my research.  I'll actually start the build in mid January.

Thanks in advance for any advice!

Lil Dragon

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Re: Questions about double walls and floor
« Reply #1 on: November 27, 2012, 10:01:48 PM »
And one other quick question.  In this situation, I have a concrete wall, space, double drywall, space, double drywall.  That is 3 sources of mass.  Would this constitute as a triple leaf?

Randy S

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Re: Questions about double walls and floor
« Reply #2 on: November 27, 2012, 10:31:14 PM »
Ok, sounds like your double decoupling which might not be necessary.. you have obviously done your homework :) give me a call direct and we can go over the rules so to speak.

Randy S.
1-888-942-7723
760-752-3030 ext 104

Randy Sieg

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

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
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    • Super Soundproofing Co
Re: Questions about double walls and floor
« Reply #3 on: November 27, 2012, 10:31:31 PM »
and yes on the triple leaf..!
Randy Sieg

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

 

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