How to Soundproof a Flex Wall: 6 Easy Steps

Flex walls are great for creating temporary partitions when you’re building a special event space. You can also use them to create another room or design an office. Whether you’re using a flex wall for general purpose or for your business, you need to know how to soundproof it.

So, How to Soundproof a Flex Wall? Adding a layer of drywall with mass loaded vinyl and fiberglass foam insulation is the best way to soundproof a flex wall. The drywall acts as a barrier against the sound, while the mass loaded vinyl and fiberglass foam insulation absorb some of the noise.

Flex walls are mostly made up of thin drywall. Hence, it’s very important to soundproof these walls from the inside because sound travels more easily through the drywall than an actual wall.

This guide will show you how to soundproof a flex wall in your home or office. The key point of this article is the stuff you can do practically and at low cost. 

How to Soundproof a Flex Wall (Step by Step Instructions)

How to Soundproof a Flex Wall (Step by Step Instructions)

To soundproof a room with flex walls, start by installing wooden studs in the walls. Then install fiberglass insulation in the cavities between the studs. Next, install mass loaded vinyl sheets on the wall and hang a second layer of drywall on top of it.

Soundproofing a flex wall is an easy DIY project that you can do in a day or two. You’ll need some basic tools, but this project is straightforward enough that anyone with basic carpentry skills can complete it. Following these steps will help you get the best soundproofing results.

Tools Required

To soundproof a flex wall, you’ll need the following tools:

  • Measuring Tape
  • Utility Knife
  • T-square or Straight Edge
  • A Pencil
  • Power Drill or Screwdriver
  • Level
  • Protective safety gear

Additional tools may be required for installation of other layers.

Step 1: Seal the Gaps and Cracks

Step 1: Seal the Gaps and Cracks

The first step to soundproofing your flex wall is to seal the gaps and cracks. This will help prevent sound from traveling through it, which will make it easier to soundproof the rest of your home.

To seal the gaps and cracks, you can use spray foam or caulk. Spray foam is great because it expands as it dries, filling in all of those little nooks and crannies that can let in unwanted noise.

You can also use caulk if you prefer a more traditional approach. Caulk is less expensive than spray foam and easier to apply, but it doesn’t expand like spray foam does, so you may need more than one coat for complete coverage.

Step 2: Install Studs on a Flex Wall

Install Studs on a Flex Wall

Installing studs on a flex wall can be a little bit tricky if you don’t know exactly what you’re doing. This handy step-by-step guide will help you get the job done right.

Grab your studs

The first step to installing studs on your flex wall is to gather the supplies. You’ll need wooden strips of varying lengths, adhesive, and a pencil with an eraser.

Next, decide how many studs you’ll use. For most projects, you’ll want between four and six studs per section of the flex wall. Two for framing pieces and one for each end. Make sure that the length of the studs matches up with your project dimensions so everything will fit together properly once it’s all done.

Once you’ve decided on how many pieces of wood are needed for each section of walling or artwork (and have purchased them) then its time to start building.

Measure and mark

  • Measure the width of your wall.
  • Mark where you want to place the studs.
  • Space them evenly on each side of your flex wall. If you’re using a level, make sure it’s level with the wall, not at an angle or perpendicular to it.

Quick Tip: A good practice is to use a stud finder to install new studs on top of existing ones that are behind the existing drywall. It can help prevent damage to the old wall and keep the new layer of drywall safe.

Pre-drill holes for the studs

Make pre-drilled holes for your studs by using a drill bit that is 1/8″ smaller than the diameter of your stud. Use a drill bit with a pilot point, so that it doesn’t slip while you’re drilling through the wall and into the wood.

Use the level

To attach the studs to the wall, you need to first use your level to make sure they are level. If they aren’t, you can use shims under one or more of them until they are

Attach the studs

To attach the studs to the wall, use drywall screws and a screwdriver or drill. You will be attaching them to a board that is already mounted on your wall. This should be easy but make sure you are careful not to damage any drywall or plaster.

Double check

At this point, you should have the studs installed. It’s time to double check and make sure that everything is level, that there aren’t any loose screws or nails, and that if there were any problems with the studs during installation, they’ve been corrected now.

Step 3: Fill Studs Cavity with Insulation

Fill Studs Cavity with Insulation

You can fill the cavities with this foam using a variety of methods. One method is to cut pieces of the foam and place them into the cavity. Another method is to use a spray foam that injects foam into the wall cavity as you press against it. 

The following are the most common types of insulation you can use to fill the cavity between the studs.

Loose-fill Cellulose

Loose-fill cellulose is the more traditional option, and it’s also more affordable. It’s made from recycled newspaper that’s been treated with borate salts and pressed into sheets. 

When you cut these sheets into smaller pieces and put them between the studs, they are great for absorbing sound waves and reducing noise transfer through the wall. 

Dense-packed Cellulose

Dense-packed cellulose is made from recycled newspaper and other paper products that are compressed into a dense foam. 

When it’s installed in the stud cavities of your flex wall, it acts as an excellent sound barrier because it absorbs sound waves that would otherwise pass through the studs. The best part is that this material is not only affordable, but also easy to install.

It’s important to note that dense-packed cellulose does not provide any thermal insulation, so if you’re looking for both soundproofing and thermal insulation, we recommend using two different types of insulation instead.

Loose-fill Fiberglass (Recommended)

Loose-fill fiberglass insulation is the most common type of insulation used in flex wall construction. It consists of small glass fibers that are blown into the stud cavity between the studs. This material is very lightweight and easy to install.

Fiberglass insulation is made from glass fibers that have been spun together to form a fluffy material. When you pack it into an air cavity, it can help block noise and keep the area warm. 

Spray Foam Insulation

Spray foam insulation is an effective option for soundproofing flex walls. It is a strong, durable substance that will not degrade over time. Spray foam can be applied to the stud cavity and will fill any gaps between the studs, leaving no space for sound waves to travel through.

Spray foam insulation is made by combining two chemicals: an isocyanate and a polyol resin. The liquid foams up when it comes into contact with the air in the room, filling in any gaps or holes that may be present in your wall. 

It creates a barrier between layers of drywall or wood studs, which can help prevent sound from traveling through your house. 

Step 4: Install Mass Loaded Vinyl (Optional)

Install Mass Loaded Vinyl

After the studs are installed, you can attach mass-loaded vinyl sheets to them. The soundproofing will be approximately 30% better if you do this. This is an optional step but it would be effective.

Mass Loaded Vinyl is a type of soundproofing material that can be applied to walls and ceilings. 

It works by using a combination of adhesives, pressure-sensitive foam and vinyl sheets to create a dense layer over the surface of the wall or ceiling. The result is a barrier that helps to block out sound.

Measure and cut the MLV

If you’re using a 2×4 stud wall, the first step is to measure the distance between your floor and your ceiling. Then subtract 1⁄8″ – ¼” from that length.

Use either a T-square or straight edge to draw a line across the sheet, then use a utility knife to cut along that line.

Attach the MLV

When you’re installing mass-loaded vinyl for soundproofing flex walls, it’s a good practice to staple or nail it into the studs every 8 inches. That way, it’ll be more secure and less likely to fall off or need repair.

Repeat this process for each sheet

With the first sheet of mass loaded vinyl in place, repeat the process for each sheet of mass loaded vinyl.

Cut away any excess material so that there is no overlap between sheets of mass loaded vinyl. Seal any seams with acoustical sealant caulk or silicone caulk

Step 5: Hang Drywall

Hang Drywall

This is the final step in soundproofing your flex wall. Follow the steps below to hang the drywall correctly:

Measure the Wall

Measure the wall, then cut your drywall to that size. The drywall should be a little over 2 inches longer than the width of your wall, and about 2 inches shorter than its length.

Drive Screws into the Drywall Sheet

Use a drill to drive screws into the drywall sheet. Make sure you’re using large screws that are designed for installation in drywall.

Repeat the Process

Repeat the process with all the sheets of drywall. If you have a very large area, you may have to do this in sections.

Prime the Surface

The first thing you’ll need to do is prime the drywall. The primer layer will help the paint adhere better and give it a more even finish.

You can use any type of primer, but I recommend using a spray primer if possible. It’s faster than brushing it on, which will save you time and effort later on.

Step 6: Use Sound Absorbing Paint for Drywall

Use Sound Absorbing Paint for Drywall

You can use any paint on the drywall you want, but I recommend using soundproof paint if you’re looking for maximum soundproofing.

Sound absorbing paint is designed to absorb sound waves from one side and transmit them through the other side of the wall. This means that instead of reflecting off the wall in all directions, it will absorb some of that energy as heat.

Benefits of Soundproofing a Flex Wall

Soundproofing a flex wall can provide a number of benefits, such as:

  1. Improved privacy: If you live in an apartment or have a shared living space, soundproofing a flex wall can help reduce the amount of noise that enters or exits the room. This can improve privacy and make it easier to concentrate, work, or relax without being disturbed by outside noise.
  2. Better sleep quality: If you are a light sleeper or have trouble falling asleep, soundproofing a flex wall can help reduce the amount of noise that comes into your bedroom. This can create a quieter and more peaceful sleeping environment, which can improve sleep quality and overall health.
  3. Enhanced sound quality: If you are a musician, podcaster, or audio professional, soundproofing a flex wall can help you create a more acoustically sound environment. This can improve the quality of your recordings, reduce unwanted echoes, and make it easier to focus on your work.
  4. Increased property value: If you plan on selling your home or renting out a room, soundproofing a flex wall can be a valuable investment. It can make your property more attractive to potential buyers or tenants who are looking for a quiet and peaceful living environment.
  5. Reduced noise pollution: If you live in a noisy neighborhood or near a busy street, soundproofing a flex wall can help reduce the amount of noise pollution that enters your home. This can create a healthier and more peaceful living environment, which can have a positive impact on your mental and physical wellbeing.

Other Ways of Soundproofing a Flex Wall

Acoustic panels are the best choice for soundproofing because they absorb sound rather than reflect it. Soundproof blankets are another good option because they help reduce echoes and other noises. If you’re looking for something more affordable, a white noise machine is a great way to go.

Read below to learn more about these soundproofing products/techniques.

You’ve read how to soundproof your flex walls by using drywall and insulation (best method). To improve soundproofing, you can try using these methods below in conjunction with drywall and insulation.

If you don’t want to get too technical, here are some other methods you can use to soundproof your flex walls:

1. Use Acoustic Panels

Use Acoustic Panels

You can soundproof a flex wall by using acoustic panels. These are sheets of material that will absorb sound and reduce the amount of noise that is transmitted through your flex wall. They’re fairly easy to install and help you create a more peaceful environment in your home or office.

They are made of fiberglass or foam, and they can be attached to a wall with adhesive or screws. Acoustic panels are available in different sizes and densities, so you can choose the appropriate one for your needs.

A great benefit of using acoustic panels is that they provide excellent insulation for temperature, noise and vibration. This makes them an ideal solution for many different types of rooms.

2. Use Soundproof Blankets

Use Soundproof Blankets

The cheapest way to soundproof flex walls is by using soundproof blankets. This is a great alternative if you’re looking for something that’s easy to install and easy to remove. The blankets are made of special materials that will prevent sound from passing through them.

The blankets can be wrapped around the entire wall or just a portion of it, depending on how much noise reduction you want. 

The best part about these blankets is that they’re very thin and lightweight, which means they won’t add any extra weight or bulkiness to your walls.

This makes them a great option if you want something that’s easy to install but still offers some flexibility as far as placement goes (you can move them around as needed).

3. Use White Noise Machine

Use White Noise Machine

White noise machine is another great way to soundproof flex walls. They work by drowning out background noises with a steady stream of high-pitched sounds that are inaudible to humans, but will mask the sounds that are coming from the other side of the flex wall.


Drywall with insulation is a great way to soundproof flex walls. You’ll need to fill the insulation behind the drywall, which will help to muffle the noise coming from outside. The insulation will also help prevent any heat from escaping through the wall.

So, What’s the best option? Well, as I’ve explained, there are a number of different methods you can use to soundproof your flex walls.

You need to choose the option that best suits your budget and the level of soundproofing you want to achieve. 

  • If you want to reduce the echoes or reverberation in your space, the best option is to install acoustic panels or soundproof blankets.
  • If you want to reduce the noise from a flex wall, consider using drywall with insulation and Mass-Loaded Vinyl (MLV).

Frequently Asked Questions

How can I make my flex walls more soundproof?

You can make your flex walls more soundproof by adding soundproofing material to the walls and ceiling of the room. This will help keep the noise inside the room and prevent it from being heard outside in other parts of your office or home.

How do you soundproof a flex bedroom?

The easiest way to soundproof a flex bedroom is by installing a layer of rigid insulation between the joists and the ceiling. This will help reduce noise transmission through the floor, which is the most common source of sound transmission in a flex bedroom.

The best way to soundproof a flex bedroom is with the right materials. You can use foam panels or blankets to block sound, but if you want to get really fancy, there are noise-reduction curtains that you can install on your windows. 

How do I make my flex wall private?

The best way to make your flex wall private is by installing a soundproofing membrane. The membrane is a thin sheet of material that’s installed over the entire surface of your flex wall. It’s made from high-quality materials that are designed to absorb sound and prevent it from escaping.

How do I block noise on a shared wall?

There are two options for dealing with noise on the shared wall. The first is to use drywall with insulation, which will help to muffle the sounds from the neighboring apartment. The second option is to use acoustic foam, which will help to absorb sound and make it less noticeable.

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Brendan Ratliff
Brendan Ratliff

As a soundproofing and acoustical professional, I have helped new homeowners, builders and remodelers with their projects. I also help contractors/designers learn how to properly install soundproofing in their clients homes.
I enjoy helping people understand the process of soundproofing and acoustical construction. is a one-stop solution for all of your soundproofing related questions.