Sound Proof Interior Walls
 

Looking to sound proof some interior walls in our house. Was initially going to contact SunCoast who blew in insulation over our garage and lanai. Wanted to first see if others have insulated/sound proofed any interior walls, who they used and how well it turned out. Thx!!

I recall reading an article about this subject, the bottom line was for maximum sound deadening you needed to have a double wall with alternating studs that do not touch the other wall, and as I recall they used fiberglass insulation that ran around the studs and between them. As for the blown in insulation, you can do this your self I have seen rental units and bagged insulation. I did this up North, I drilled 2 holes one at the top and one at the bottom. I put a screen on the top one and the insulation was blow in the bottom one. You could tell when the wall was full from the top hole. I would do this first and see if it provides enough sound deadening, if not you probably need the double wall approach. Hope this helps.

It's very difficult to soundproof a wall. The best sound barrier is a high dense material, like concrete, or multiple layers of drywall. Fiberglass insulation wlll do very little to reduce sound transmission. If you have the typical wood stud construction, the sound will transmit directly through the wood. That is why they recommend staggering the studs, so that there is no continuous wood material through the wall from one side to the other. I think the best thing you can do is to stagger the studs and add a few addtional layers of drywall.

Are you trying to keep interior noise down or exterior? We did a double layer of sheetrock during construction, on the inside walls in our home for the master bedroom to eliminate house noise, tv, kitchen, laundry etc. It would probably be the cheapest way.

Could be complicated found this video I'm sure there may be others. How to Soundproof a Room! - YouTube

You can only lessen the sound transfer without major reconstruction.

We did. The layout of our house put the master toilet room right next to the dining/living area. We had someone come in, remove most of the drywall on that wall and put in actual sound proofing insulation then they put up new drywall. It has been great. Not 100% but pretty close. Glad we did it.

When we built our house, we asked about sound-proofing the bedrooms, bathrooms, and laundry room. The Villages designer said that we could add insulation to those interior walls and solid-core doors. However, we were told that although it would lessen the sound, it was not "true" soundproofing. It was not expensive, so we did it. It's certainly good enough for our purposes. When I close the laundry room door, I can barely hear the wash machine. But, it's not dead-silence. At that time, it was the best that The Villages would offer in their new-construction homes. They were very honest and did not try to upsell us into something that we would be disappointed with.

Has anyone tried the foam injection between the studs?

In my opinion, that would provide very little sound reduction.

Correct. There are even fancier methods for sound deadening between row houses, such as rubber foam matting. I believe one commonly used method is adding 5/8” Sheetrock to both walls, often sealed with non-hardening acoustic caulk (available at Lowe’s and Home Depot, as it is being used more and more in home construction).

You could try this: 440 SoundBarrier Controls Sound in Floors, Walls and Ceilings | Homasote

Check out this article from Fine Homebuilding. (You only get two articles free—after that you need to join.) The photos below are the whole article and are in line with what Village Tinker wrote. The author is a highly-respected builder and author.
Building Soundproof Walls - Fine Homebuilding

It will also cut down on cell phone and wifi signals-- be careful

I’m not trying to be wise guy, but why is this necessary in single family homes in villages??

i wondered, too. does the resident want noise from the outside kept out, or is there noise in the home he/she did not want to disrupt the neighborhood? , (ie: practicing drums or other loud instrument.)

I applied cork board panels to a bedroom wall that has the living room on the other side to cut TV noise.
It worked very well. Might have to adjust any outlets to new wall thickness.