Author Topic: Question on constriuction of floating wall / ceiling  (Read 4034 times)

allnaturalbc

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Question on constriuction of floating wall / ceiling
« on: January 11, 2011, 04:12:17 AM »
I'm doing a renovation of a den and want to increase sound transmission loss from a bathroom next door and a kitchen upstairs. The walls and ceiling will be opened.  My plan is:

Ceiling:

- Two layers of drywall with green glue to floor above between floor joists
- Roxul insulation between joists.
- Layer of MLV attached to joists
- Sound clips and hat channel attached to joists under MLW
- Two layers of 5/8 drywall with green glue between

Wall (one on bathroom side)
- Roxul
- MLV attached to studs
- clips amd hat channel
- two layers of 5/8 drywall with green glue

I have two questions:

1) Is that the best approach to install MLV over studs before clips and hat channel?

2) I'm a little uncertain on the finishing of the floated ceiling and wall.  I was planning acoustic caulk in the 1/8 gap around peremiter and then tape and mud.  But I  have read conflicting recommendations on whether you can tape and mud the permimter.




Comments?  Thanks!

Randy S

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Re: Question on constriuction of floating wall / ceiling
« Reply #1 on: January 11, 2011, 04:55:23 PM »
You are right on the money!!! Great Job! 

make sure your using 3 tubes of green glue for every 4' x 8' sheet of drywall or 1 tube for every 10.66 sqft.

MLV stapled directly to the studs hung vertically so seams fall center of stud or joist, tape seams with lead tape and caulk perimeter and penetrations.

Remember to use putty pads on the back of outlets and switch boxes! you are building a fish tank so to speak...NO LEAKS ANYWHERE!

As far as the perimeter do NOT use tape and mud.. just the caulk, use factory edge of drywall to the perimeter and use cut edge in the field of the wall/ceiling. 1/8" gap is perfect!
Randy Sieg

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

allnaturalbc

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Re: Question on constriuction of floating wall / ceiling
« Reply #2 on: January 30, 2011, 08:59:19 PM »
Hi Randy,  Thanks for the confirmation.  I have one quick follow up question.  I'm just grappling with finishing the ceiling / wall interface.  Can I use crown moulding if I attach it only to the wall and just use a bead of caiulk on the ceiling side.  I ask because my experience with acoustical caulk and no taping or mudding is the gap between the ceiling and wall does not look finished.  Any other suggestions?

Randy S

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Re: Question on constriuction of floating wall / ceiling
« Reply #3 on: January 31, 2011, 09:06:44 PM »
That is correct..attach molding to wall side only leaving a 1/8"-1/4" gap filled with acoustical caulk.

I must say, you have done your homework! and it is nice to see when someone has a clear understanding of the principles that need to be followed for maximum noise abatement!

Again Great Job!

Call me when your ready for clip and channel layout.

Randy S.
760-752-3030 ext 104
Randy Sieg

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

 

anything