Soundproofing A Common Wall

Combating sound bleed through a common interior wall is our signature treatment.   If you have noise issues between adjoining spaces, rest assured that there are steps you can take to gain more control over the leakage and create sound proof walls.   If you need more privacy, more confidentiality, more peace and more quiet, welcome to your solution for soundproofing walls.   Regardless of whether you are soundproofing existing walls, remodeling, or wanting to soundproof interior walls under construction, the treatment illustrated below will apply, and can combine to produce up to a 90% collapse in your noise bleed.  Results will vary per application based on leakage, flanking paths, quality of assembly, sound meter accuracy and a host of other components that stretch beyond the control of the layering treatment.

Questions?  1-800-638-9355

How to Soundproof a Wall

How to soundproof a wall is illustrated in the short video below, and/or the illustration to the right.   There is a layering system that you can apply to your starting point (finished wall or exposed frame). Layer 1 is the density of a product we ship to your job site called dB-Bloc. Staple it right to your existing wall. Layer 2 is a set of channels or furring strips that go horizontally up the wall, anchor these over the dB-Bloc and into your studs. Layer 3 is a new layer of 5/8” drywall that anchors to the face of your strip system to form a new dead air pocket inside your assembly.   This 3-step layering system will deaden the majority of your noise bleeding through your common wall resulting in sound proof walls.  But again, each treatment represents a unique starting point, with a set of variables that may or may not impact the results of each treatment.

soundproofing existing interior walls

Noise Reduction Through Common Wall Assembly

The density of dB-Bloc prevents your wall assembly from being able to accept vibrations.   Think of it as placing the flat of your hand against the stem of a wine glass or the face of a drum or the prongs of a tuning fork. When these objects are unable to conduct vibration, they cannot produce or transmit sound.   Density kills vibration. The same holds true by placing the density of dB-Bloc against your common wall.   Vibrations die, the wall becomes unable to transfer the energy.

The channel or furring strips are there to then force the disconnection. Think of it as snipping the string pulled tight between two coffee cans.   Your existing interior wall has framework connecting your rooms together.  The frame is your culprit.  The frame is allowing structure born vibrations to pass freely back and forth between your rooms.   Your goal is to sever the connection, and force the collapse of the transmitting wave.   For existing interior wall assembly’s, this is accomplished with the channel system. For new build or remodel, consider the double wall or staggered stud assembly’s shown below.

See dB-Bloc
Why Noise Bleeds Through Walls and How to Sound Proof

Sound Barrier Treatment Blocks Common Wall Noise Bleed

The goal with your common wall assembly is to line it with the “Density + Disconnection” formula.  In so doing, you will impede the wall’s ability to conduct structure born vibrations, and force the collapse of the transmitting sound wave.   The treatment is NOT about stuffing batting insulation between your studs in the wall….which is a great thermal insulation, but less effective for combatting sound bleed.   The dB-Bloc sound barrier treatment layers over the entire cavity space of your wall surface allowing you to soundproof walls effectively.  For questions related to the treatment, call our help desk at 1-800-638-9355.

See dB-Bloc
Adding density and disconnection to a common wall to combat sound bleed for noise reduction

Demo:  dB-Bloc + Disconnection:

Common Wall Noise Reduction

dB-Bloc is an ultra thin, ultra dense sound barrier membrane that layers inside a common wall or floor/ceiling assembly to help deaden the transfer of sound through to the adjoining room.    The mass loaded vinyl ships to your project site in 54” x 30’ rolls, it measures just .125” thick, but weighs nearly 150 pounds per roll.  


See dB-Bloc

Sound Proof Walls with dB-Bloc

We offer a family of products all related to our dB-Bloc sound barrier membrane.   First, consider the RSIC clip system over standard resilient channels.   These clips enhance the process of disconnection once the density of your dB-Bloc is installed.   Simply anchor them into your assembly, snap hat channels into then, and then your final layer of drywall as we show here.   For portability in your wall soundproofing project, consider our QBS Sound Barrier Blankets that free hang against a wall and have the dB-Bloc membrane lined inside.   Finally, for clients seeking a combination of sound deadening through the wall + sound absorption back off the wall, opt for our popular FabricBloc Panels.   These are cloth wrapped sound boards with the dB-Bloc once again lined in the middle of the panel.


See RSIC Clips See QBS Blankets
Sound isolation clips help sound deaden noise bleeding through a common wall

How to Sound Proof a Wall in Three Steps

The answer to blocking noise from bleeding through your common walls is nothing more than a simple layering system.    For help in crafting your solution and getting your materials ordered, call our help desk.   We ship you the dB-Bloc, and you supply your channel system and drywall from your local building supply center.   Please note that not all sound wave energy is passing straight through your common surface, rendering any layering system susceptible to leakage and a decay in sound values back.  Care must be given to isolating the wall and ensuring the noise values aren’t able to bleed through other cavity spaces or connection points including ceiling, floor and adjacent non-treated wall surfaces.


1. Disconnect

Channel systems, RSIC Clips, double walls or staggered stud walls are all means by which to disconnect your existing wall assembly.

2. Add dB-Bloc  

The density of this membrane impedes vibration. Layer this into your assembly prior to your channel system and drywall.

3. Apply New Drywall

We recommend a 5/8″ thick finished drywall surface over the standard 1/2″ on your common wall assembly.

Why Clients Love dB-BLoc

dB-Bloc is a stock item that will drop ship to the door step of your project site within days upon order. The rolls will be heavy, weighing in at nearly 150 pounds per roll. For more than 25 years, we have been selling this layering treatment to thousands of satisfied customers who today enjoy a more sound insulated space by soundproofing walls.   Coverage amounts equal 135 square feet per roll.   Each roll measures 54″ x 30′.

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Sound Proofing Walls with Mass Loaded Vinyl Installation

Framing Techniques

Whether your common wall is yet to be built, or in remodel mode, or an existing finished surface, there are a variety of methods for breaking the connection between the two adjoining rooms and forcing the collapse of the transmitting sound wave.

Channel systems anchor to your existing finished surface. Double wall or staggered stud assembly’s are the alternative if the framing is yet to be built.   Again, we disconnecting your wall, and forcing more density into your assembly, sound wave transmission will decay straight through the assembly.   But non-common wall paths can still bleed the noise, so carefully review your starting point, and minimize other paths that may hinder your results back.

double wall or staggered stud wall assembly's to deaden sound bleed

Soundproofing Walls: Q&A

How to Design Soundproof Walls from Scratch

Learning how to soundproof a wall is key. The goal in commercial wall soundproofing is to line the wall with additional density and disconnect the framing structure. This will impede the wall’s ability to transmit structure borne sound waves and thus create sound proof walls. The key component in the assembly is to layer our dB-Bloc sound barrier membrane with the preferred method for wall disconnection.

How to Retrofit the Right Soundproofing Treatment to Existing Walls

Around 95% of our clients start with an existing, finished wall. We instruct them to line the wall with the sound barrier membrane called dB-Bloc, then force a disconnection in the assembly using a hat channel system, and then apply a new layer of 5/8” drywall. The treatment can collapse up to 90% of the sound attempting to bleed through the wall soundproofing treatment.

How to Measure Sound Bleed Through a Common Wall

Sound meters are available for purchase online. Simply test the noise levels in room A, then in room B, and gauge the difference in the sound levels. Should you then decide to pursue your commercial wall soundproofing project, line one side of the finished surface with the dB-Bloc layering system featured on our website.

What Are Flanking Paths?

Flanking paths are the pathways that noise takes to cheat your wall soundproofing treatment. These paths can be airborne or structure born. Airborne paths include any cutouts in your surface (doors, windows, outlet plates, supply/return vents, etc). Structure borne paths include common contact points such as the joists, studs or cement slabs that connect rooms together. When soundproofing a wall, these flanking paths will combine to lower your overall values. It’s important to learn how to soundproof a wall properly, so you can minimize these flanking paths.

What Is Mass Loaded Vinyl?

Mass loaded vinyl is an ultra-thin, ultra-dense sound barrier membrane that’s layered behind drywall to help deaden the noise that travels through common surfaces. Our brand name for this soundproofing wall product is dB-Bloc.

What Is the Best Way to Block Noise Through a Common Wall?

The goal for successfully treating a common wall is to break the structural connection points between the two rooms and line the assembly with more density. This forces the collapse of the transmitted sound waves and produces a soundproof wall. Density impedes vibration, much like placing the flat of your hand on a tuning fork, and disconnection forces the collapse of the vibrations. Density comes in the form of mass loaded vinyl called dB-Bloc. Disconnection is generated with a set of hat channels that are anchored to the wall. This soundproofing wall assembly can be easily applied to existing wall surfaces.

Why Batting Insulation as Soundproofing Is a Myth, and Why It Doesn’t Soundproof Your Wall

Batting insulation is old school and should not be thought of as insulation protection against sound bleed. This material generates thermal protection from one room to the next, but it lets sound waves bleed right through it. Remember, the primary culprit in common wall noise bleed is the frame that connects the rooms together. Disconnecting the framing and lining the entire wall surface with dB-Bloc forces the collapse of the noise.

How Mass Loaded Vinyl Will Outperform Pre-Engineered Drywall

The goal with any common wall soundproofing effort is to impede the wall’s ability to accept vibrations by adding density to its surface. This is similar to placing your hand on top of a wine glass so it cannot conduct sound after running your finger tip across its top. Pre-engineered drywall has embedded density, and yes, it helps assist in the collapse of transmitted sound waves. What works better is to separate the density from the drywall by placing an air gap between the two mediums. For the bulk of existing common walls and retrofitted treatments, you’ll want to staple mass loaded vinyl to the wall, then a channel system, and then 5/8” standard drywall. Much like layering clothing in cold weather, you’ll want to layer the density in your assembly in the form of pre-engineered drywall.

Why It’s Important to Disconnect Your Wall, and How to Do It

Think of disconnecting your wall like cutting a string that’s pulled tight between two cans. Most walls are built with a single frame that connects two rooms together. By adding a channel system to the finished wall and then adding new drywall over it you have created a break in the connection points. You are forcing the sound waves to collapse within your wall assembly, rather than letting them pass through. Your net result is a soundproof wall.

Why Mass Loaded Vinyl Deadens Sound Bleed

Adding density to your common wall assembly will force the collapse of the wall’s ability to accept and conduct resonance. This is similar to taking the flat of your hand and placing it on the face of a drum or the strings of a guitar. By preventing these objects from vibrating, you kill their ability to conduct a sound wave. The same holds true for how to soundproof a wall. By adding the density of mass loaded vinyl to your common wall surface you force the collapse of the transmitting sound. (See dB-Bloc.)

Does this treatment really work?

The answer is yes, but to what degree.   The success of your treatment depends on how much of your energy is already passing through other mediums that the dB-Bloc layering treatment will not address.    Attention must be given to the various structure born or airborne energy paths that the sound waves could use to circumvent your layering treatment.  Results will vary for every application.


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Contractor’s Corner

For contractors in the building trade, interested in the advanced techniques for soundproofing common wall, ceiling and floor surfaces in today’s market, we invite you to sign up for our Contractor’s Corner. This is a free online tool that delivers timely newsletter style messaging to the building trade. For you drywallers, framers, architects and general trade contractors out there, we welcome you to our family of third party sound insulation experts. We look forward to servicing you and your clients with our noise mitigation products and procedures!





Combating Noise Bleed

Your sound barrier treatment will require 100% coverage of your common surface.   Use this form to submit your dimensions.   We will quote your project back.  For questions related to your treatment, call our help desk at 1-800-638-9355.

Combating Noise Bleed

Blocking Noise Bleed

Your sound barrier treatment will require 100% coverage of your common walls.   Use this form to submit your wall dimensions.   We will quote your noise reduction project back.  For questions related to your treatment, call our help desk at 1-800-638-9355.