303.774.9992 sales@sonusna.com

People create soundproofed rooms for a variety of reasons, ranging from the confidentiality of a lawyer’s office to just getting the maximum sound quality from a room containing a home theater. Whatever your reasons for creating a sound-proofed room, I’ll explain how this modern feat of materials technology is achieved.

Soundproofing walls is all about separating outer and inner, creating a sealed space in which no outside sounds can travel in, and no inside sounds can travel out. This is achieved by increasing the mass and density, as well as sealing all gaps. 

Materials for Soundproofing


Insulation for sound-proofed walls can be accomplished with a few different materials, but I’m going to recommend just two, and those are denim and cellulose.

Denim insulation is actually made from mostly post-consumer material, meaning that you’re actually using recycled material, which is always a plus. It’s also an easy material to work with and has very high noise-reduction values.

Cellulose is also made partly from recycled materials, and is a very eco-friendly way to go, which is important in an industry dominated by foams which will end up in a landfill someday. 


For reflecting, rather than absorbing sound, gypsum is the most highly recommended material. It has a variety of advantages, including being resistant to mold and mildew, as well as being extremely economical, and able to achieve maximum sound-blocking with minimum thickness.

Acoustic Gap Sealant

You’ll never achieve full sound-proofing if you don’t seal your gaps, and this would be a tremendous waste of investment, so don’t neglect it! You’ll want to use our specialized acoustic gap sealant, and these can be applied along all gaps of your walls. That really means all gaps, as even one unsealed edge can be highly detrimental to your sound proofing quality. 

Soundproofing Process

Soundproofing your walls is a four-step process, consisting of adding layers to all four walls. We also sell acoustic panels with various edgings to suit different needs.

1. Install your first gypsum board

This is the first layer of gypsum as the outermost layer, serving as a more sound-blocking material than normal drywall. It should be attached to the frame using .5 inch drywall screws, with no gaps. 

2. Install insulation

This layer of insulation will serve as the core of your sound-proofed walls, although for even further soundproofing, you can add more layers of gypsum/insulation. Assuming you’re doing just the one layer, you’ll want to use our 2-3” denim or cellulose sheets, cutting them so that they tightly fit within the wall frame leaving no gaps. 

3. Layer of gypsum on the inside of the insulation

On this inner wall, we’re going to add another layer of gypsum board, this time leaving a quarter-inch gap around all the edges. This quarter-inch gap will then be sealed by applying your acoustic sealant around all the edges. 

4. Another layer of gypsum drywall

Now, you’re going to install another sheet of gypsum on top of the one you just did, on the inner wall, and the same as previously, with gaps around the edges, then sealing those gaps. We also recommend using a special sound-proofing glue on the gypsum-facing side of this drywall. This layer should be attached using 2.5-inch drywall screws to go through the previous layer of gypsum, and you should stagger the seams of these two layers, of course. 

5. Finish

Finally, you can tape, sand spackle, primer and paint, or do whatever you want to do to this top layer of gypsum drywall.

This is a good recipe for a basic soundproofing that will fit most people’s needs. More advanced methods do exist, such as building de-couple walls and adding more layers of gypsum/insulation, but this method will eliminate most sound. It’s also possible to create a great deal of soundproofing, or enhance the above methods, by using our flat, impact resistant, and tackable acoustic wall panels. Our 3-D and acoustic art panels can also improve your soundproofing while providing beautiful decorative additions to any space.