Drywall and sound insulation

We're doing some remodeling to create a new master bedroom. We're carving a closet 6 feet wide by 2 feet deep out of the end of an unrelated bathroom and I want good sound insulation between the back of the closet and that bathroom. The drywall guy wants the insulation guy to handle it with some rock wool between the studs. Google suggests that we can do a lot better with QuietRock drywall, hanging the drywall on floating nailers, or at least thicker drywall. Anybody have any real experience with this? This is a small area so I'm not too worried about the expense.

Go the rock wool route. Simple, cheap, and effective. Get decent closet doors too.

Had a recording studio when young, you can take it as far as you want, floating concrete floors on springs Separate 2 x 6 walls on each slab that dont touch. I was on a budget used a ton of drywall Roxel and acoustic sealant.

More layers of drywall best bang for the buck. Acoustic sealant. Someone just told me there is a new Roxul that offers sound and better R insulation still. Havent had time to look.

Roxul "safe and sound" is supposed to be better at stopping sound no so much heat. Double stud is good but takes up room. My wife would pack closet full of clothes so no noise gets through
Bill D

When I remodeled the excutive offices of a drug store we used 2 rock wool and 2 layers of dry wall

I used Roxul in the ceiling of my basement shop. Did not use drywall to cover it, so Roxul is exposed. It significantly reduced the sound in the family room directly above the shop. Did not completely stop the noise but did a pretty good job to reduce it.

The closet itself is good sound insulation. Getting the drywall guy to put up a couple of special sheets of drywall not worth it IMO. Make sure that any plumbing pipes exposed by the work are isolated from the framing- this is maybe the biggest noise factor.

This was a ceiling done to stop sound transmission. It worked very well. Number of layers of drywall with roxul compressed between with acoustic sealant on all the edges of the drywall.

Attachment 518484

Warren - That's not practical here but I can believe it worked.

The closet as framed will be 24 1/4" deep with 1/2" drywall, so not much depth available to lose. The back of the closet is the bathroom wall and will be just a few feet from the bed. I don't want some kid putting his ear to the wall and hearing too much. Not a problem for us - no kids - but I'm trying to be considerate of future residents.

I'm feeling better about the rock wool and there's room for another layer of drywall.

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Originally Posted by Warren Lake

This was a ceiling done to stop sound transmission. It worked very well. Number of layers of drywall with roxul compressed between with acoustic sealant on all the edges of the drywall.


Attachment 518484

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Cool. My house walls from the outside are Cedar siding, 5/8 OSB, 1/2" urethane foam,2x6 walls with cellulose with binder, 1/2" urethane foam, 3/4 strips run perpendicular to the studs giving a dead air space and then finished with 5/8 drywall. did it for the insulation, but it is amazing how quiet the house is even with the crazy amount of glass [triple pane] I have.

Decoupling with floating fasteners is very important for sound proofing. Lots of insulation and lots of drywall will help a little, decoupling helps a lot. Green silicone adhesive followed by removing the drywall screws is recommended for attaching sound board and drywall when soundproofing. Spring loaded hanger clips work even better. A double stud wall with insulation woven horizontally through the studs works well. The top and bottom plate of the stud walls should "float".

I did the double stud wall with horizontally woven insulation at our last house. With that and double drywall on both sides, it was very quiet.