Author Topic: Soundproofing over an existing party wall with sheet lead  (Read 5817 times)

allnaturalbc

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Soundproofing over an existing party wall with sheet lead
« on: December 03, 2009, 11:43:17 PM »
I am in a townhouse.  My dining / living room wall is a part wall.  It is 2*6 wood frame construction.  The drywall on each side is attached to offset studs so there is not direct connection except the ceiling and floor plates.  The wall is pretty good except for one thing.  There is a washroom on one side and the plumbing noise is quite loud (to the point the TV needs to be turned up when in use).  It is really only an issue when the shower or bathtub is used.  I suspect it is the higher velocity flow in copper pipes that causes the wooshing (it's not water hammer or anything, think of a constant whooshing sounds resonating in the wall).  The most annoying thing is sounds when having a dinner party.

I recently went through the effort of:
- removing my side of the wall,
- wrapping all of the plumbing in armaflex,
- ensuring it is all attached securely (around insulation rather than with metal couplings direct on piping)
- installing Roxul safe and quiet insulation
- putting up 2 layers of 5/8"drywall.

It reduced some sound but frustratingly not much better when shower in use. One thing we noticed is some of the supply lines run direct through the studs.  They are quite snug and only touching studs attached to drywall on other side.  But there is still vibration to my side.

My question is this.  I do not want to re-open the wall or take down new drywall.  What I am wondering is whether installing lead sheeting (say 4 lb / sf) to my side of the wall, taping all seems and caulking around sides would dampen transfer of running water sounds. Two related questions on this technique:

- I have read I should first put furring strips on the wall and then attach the lead sheeting to that and seal.  The cover the lead (next question below).  But my question is whether that creates to dreaded "triple leaf" effect I have also read about.

- In terms of covering the lead, I would rather not work with more drywall.  I was thinking of simply using wood paneling, cork tiles or something else aesthetically pleasing.  I'm wondering if this matters and if it will add to or detract from the vibration transfer.

Comments much appreciated!

Randy S

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Re: Soundproofing over an existing party wall with sheet lead
« Reply #1 on: December 22, 2009, 05:03:22 PM »
ok, I have had first hand experience with this and without the pipes completely decoupled the results will be questionable at best.
I would say in this situation the best approch would be to remove the 2 layers of drywall add MLV and use clips and channel then drywall. Since your trying not to remove existing drywall then I would add a 3 tube green glue per 4'x8' sheet and another 5/8" drywall..

You share the same base and top plate, the pipes are hard mounted to the studs...all this is structure vibration and decoupling is the answer, Green Glue is the band-aid.
Randy Sieg

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

allnaturalbc

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Re: Soundproofing over an existing party wall with sheet lead
« Reply #2 on: January 07, 2010, 11:33:13 PM »
thanks for the reply Randy.  very much appreciated.  given it is very intermittent noise problem, i was hoping to avoid reopening the wall.  just one follow up question.  would two layers of 1/2" drywall with greenglue between both offer any additional improvement?  would adding MLV first (via adhesive) and then one layer of green glue and drywall offer any additional meaningful improvement over just drywall (one or two layers).  i'm not looking to eliminate the noise - just greatly dampen it. thanks so much!

ok, I have had first hand experience with this and without the pipes completely decoupled the results will be questionable at best.
I would say in this situation the best approch would be to remove the 2 layers of drywall add MLV and use clips and channel then drywall. Since your trying not to remove existing drywall then I would add a 3 tube green glue per 4'x8' sheet and another 5/8" drywall..

You share the same base and top plate, the pipes are hard mounted to the studs...all this is structure vibration and decoupling is the answer, Green Glue is the band-aid.

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
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  • Posts: 788
    • Super Soundproofing Co
Re: Soundproofing over an existing party wall with sheet lead
« Reply #3 on: January 08, 2010, 05:49:26 PM »
Yes adding green glue and another layer of drywall will make some improvement, the real question is how much...
Going in that direction, I would do 1 layer at a time and access my results.
make sure you allow enough "curring time" in order to evaluate the reduction value.
Randy Sieg

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

 

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