Is Spray Foam Insulation Good for Soundproofing (The Truth!)

If you want to get something done in the best and most efficient manner, it shouldn’t go wrong. And that’s what happens with spray foam insulation. Of all the different insulation methods, spray foam insulation is the favorite option of many homeowners because it is the safest and most efficient method of insulating their homes.

But, Is Spray Foam Insulation Good for Soundproofing? Spray foam insulation is a great way to improve the energy efficiency of your home but it doesn’t actually reduce much noise. If you want to reduce the amount of outside noise that gets into your house, you’ll need to use a combination of different types of insulation and soundproofing measures.

When installing a new ceiling or finishing an apartment, it’s important to know the difference between batts and blown-in insulation. Today I’ll be talking about soundproofing foam insulation. Let’s get into the nitty-gritty details of spray foam insulation.

Does Spray Foam Insulation Reduce Noise?

Does Spray Foam Insulation Reduce Noise?

Spray foam insulation can reduce noise, but it’s not a miracle worker. It’s still important to invest in other steps to reduce noise, like using a soundproofing material on your walls and windows, or adding a layer of drywall over your existing walls.

If you’re wondering whether spray foam insulation can reduce noise, the answer is “sort of.” Spray foam insulation is good for insulating your home, but it’s not the best way to reduce noise.

The reason spray foam insulation is so effective at insulating your home is because it’s dense and airtight, which means it blocks the transfer of both heat and cold. 

This means that spray foam insulation can help keep your house warm in the winter and cool in the summer, but this also makes it less effective at reducing sound.

For example, if you have a door that rattles in its frame when you close it because the weather stripping around the door is old and torn up, then spray foam is going to be a great solution because it’s easy to install and will create a tight seal around your doors. 

However, if you have noisy pipes or ductwork in your walls that are making a lot of noise every time they vibrate, then spray foam isn’t going to help much with that.

Spray foam insulation works by sealing off gaps and cracks, so these spaces can’t be filled with air when they’re supposed to be filled with something else, like sound. Sound travels through air, so if there aren’t any gaps or cracks left open then there isn’t going to be much room for sound to travel through either.

If you want an effective way to reduce noise in your home, it’s best to hire someone who knows what they’re doing. 

The professionals know how to install soundproofing materials like acoustic ceilings, double-pane windows, and flooring made from special materials that will keep out unwanted noise from outside.

Best Spray Foam for Soundproofing (Two types of spray foam insulation)

Best Spray Foam for Soundproofing (Two types of spray foam insulation)

Open cell foam is better than closed cell foam for soundproofing because it traps air. This means that open cell foam is more effective at reducing sound, and can be used as a sound barrier or to help reduce echoes.

Closed cell foam is not as effective at reducing sound because it has no space in between the cells of its material. This makes it more difficult for sound waves to pass through the material, which can cause echoes.

Open Cell Foam for Soundproofing

Open cell foam is a great material for soundproofing. It’s made up of millions of tiny little cells, which allow air to pass through but not sound. 

This means that as the little cells vibrate in response to sound waves, they absorb the energy of the sound waves, which reduces their impact on your space.

These little cells are also great at absorbing moisture from the air, which means that they’re great at keeping your space dry and mold-free.

Closed Cell Foam for Soundproofing

Closed cell foam is a type of insulation that works by blocking sound waves. It’s made up of tiny air pockets that are surrounded by a thin layer of plastic. The air pockets act like little sound-proof rooms, which absorb and block sound waves as they travel through the foam.

When you’re insulating your home or office, closed cell foam is a good choice because it’s inexpensive and easy to install. It’s also fire-resistant, so it can help keep your family safe in the event of an emergency.

Spray Foam Insulation vs Traditional Soundproofing Materials: Which is Better?

Spray Foam Insulation vs Traditional Soundproofing Materials: Which is Better?

When it comes to soundproofing a room or a building, there are various materials and methods available. In recent years, spray foam insulation has gained popularity as a soundproofing solution. But how does it compare to traditional soundproofing materials? Let’s explore the differences and similarities between the two.

Soundproofing Capabilities

Spray foam insulation is known for its excellent soundproofing capabilities. It works by filling in the gaps and crevices in the walls, floors, and ceilings, which reduces the amount of sound that can pass through. Traditional soundproofing materials such as acoustic panels, fiberglass batts, and mass-loaded vinyl also have good soundproofing properties, but they may not be as effective as spray foam insulation.


Spray foam insulation can be more expensive than traditional soundproofing materials. The cost of spray foam insulation varies depending on the size of the area to be covered, the thickness of the foam, and the type of foam used. Traditional soundproofing materials such as acoustic panels and fiberglass batts are generally more affordable.


Spray foam insulation requires professional installation as it involves the use of specialized equipment. It also requires proper ventilation during installation as the fumes can be harmful. Traditional soundproofing materials, on the other hand, can be installed by DIYers with basic tools.


Spray foam insulation is a long-lasting solution for soundproofing. It doesn’t degrade or settle over time, which means it maintains its soundproofing capabilities for the lifespan of the building. Traditional soundproofing materials such as acoustic panels and fiberglass batts may need to be replaced over time due to wear and tear.


Spray foam insulation is not the most aesthetically pleasing option for soundproofing. It can be visible in some areas and may require additional finishing touches to blend in with the surrounding surfaces. Traditional soundproofing materials such as acoustic panels and fiberglass batts can be designed to match the existing decor of the room.

Comparison between Open Cell Foam and Closed Cell Foam

Open cell foam and closed cell foam are two types of foam that are used in a wide variety of applications. They are both used as insulators, but they have some distinct differences.


When comparing open cell foam and closed cell foam, it’s important to remember that the two different types of foam are very similar in terms of how they’re made, as well as their primary uses. 

They both feature pores that let air flow through them, but open-cell foam has a lower density than closed-cell foam, meaning that it’s more lightweight and spongy. Closed-cell foam is more dense and firm than open-cell, but it still retains the ability to be lightweight.


Both open cell and closed cell foam are durable, but they have different properties that make them more or less suited to certain applications.

Open cell foam is soft and flexible, so it’s easy to compress, but it can be damaged by sharp objects. It adds cushioning without adding much structural support.

Closed cell foam is also soft and flexible, but it resists compression. It adds structural support to the material it’s used in.


The R-Value is the measurement of how well insulation resists heat flow. The higher the R-value, the better.

Open cell foam has an average of 3 to 4 R per inch, while closed cell foam has an average of 3 to 6.5 R per inch.


The main difference between the two is that open cell foam is permeable to air and water, while closed cell foam is semi-impermeable to water but not air. When it comes to insulation, both types of foam can be used as an air barrier.

Sound Insulation

Open-cell foam is better at soundproofing than closed-cell foam because of its greater permeability. Open-cell foams have larger pores and are therefore able to absorb more sound waves, which is why they are used in the construction of sound studios. 

Closed-cell foams are less permeable and therefore do not absorb as much sound as open-cell foams do.

Heat Insulation

Open-cell foam is a type of insulation that is made from tiny pockets of air. It’s used in dry conditions because it absorbs water easily, which makes it less effective when the temperature drops below freezing. 

Closed-cell foam has no pockets of air, so it doesn’t absorb any moisture and can be used in humid or wet environments.

Spray Foam vs Rockwool for Soundproofing (Which is better?)

Spray Foam vs Rockwool for Soundproofing (Which is better?)

Rockwool absorbs more sound than spray foam because it’s denser than spray foam, which means that it has less surface area per volume of material. That means it’s easier to dampen the sounds around you when you’re using rockwool as an insulation, compared to using spray foam.

The STC rating of rockwool is higher than that of spray foam. STC rating measures how much sound a material can block, with higher ratings meaning more sound will be blocked. Rockwool has an STC rating up to 45, while spray foam has an STC rating around 40.

Rockwool is a mineral wool thermal and acoustical insulation made from rock. It’s made by melting and then spinning rock at high temperatures. The result is a dense, lightweight material that has excellent thermal and acoustical properties.

Spray foam is a polyurethane-based insulating foam that expands to fill any cavity. It’s often used as an alternative to traditional insulation in roofs and walls, as well as to seal gaps around ductwork and other openings. 

However, because it expands so much, it can lead to air leaks between the inside and outside of buildings, the opposite of what you want when you’re trying to soundproof them.

Spray Foam Insulation Cost

Spray Foam Insulation Cost

The cost of spray foam insulation varies depending on the type you choose. Open cell foam is less expensive than closed cell foam. The average cost of open cell spray foam is $0.12 per square foot. Closed cell spray foam averages $0.20 per square foot.

The cost of Spray Foam Insulation can vary depending on a number of factors. The biggest factor is the type of spray foam insulation you choose. Open cell foam costs about $0.12 per square foot, and closed cell foam costs about $0.20 per square foot. The other factors that affect the cost are:

  1. How much coverage you need: If you’re looking for 100% coverage, then it will be more expensive than if you were just looking for 50% coverage.
  2. The thickness of the material: If you’re using thicker materials (e.g., R-19), then it’s going to cost more than thinner materials (e.g., R-6).
  3. Where you live: Some areas have higher labor costs than others, so that will affect the price as well.

Best Alternatives for Spray Foam Insulation

If you’re looking for an alternative to spray foam insulation, fiberglass insulation is your best bet. It’s much cheaper than spray foam and has similar insulating properties. Rock wool and acoustic foams are also worth considering if you’re looking for something to reduce noise in your home or office.

If you’re looking for the best alternatives to spray foam insulation, we’ve got you covered. We’ve compiled a list of three options that will help you save money and get the same results as traditional spray foam.

Spray foam is an excellent choice for insulating your home, but it can be expensive. If you’re looking for an affordable alternative, consider one of these options:

Fiberglass Insulation

Fiberglass Insulation

Fiberglass insulation is one of the best alternatives for spray foam insulation for soundproofing. It is a natural insulator, meaning it will not only help to keep the heat in your home, but also keep the noise out. Fiberglass insulation can be installed in walls, ceilings, floors, and ductwork.

One of the benefits of fiberglass insulation is that it comes in a wide variety of forms and thicknesses. This means that you can choose an option that works best for your situation based on your needs. 

For example, if you are looking to insulate a wall, there are several options available including batts and rolls that come in different thicknesses depending on how much soundproofing you need or what kind of space you are working with.

Another benefit of fiberglass insulation is that it is environmentally friendly because it does not contain any harmful chemicals like polyurethane or polystyrene which would otherwise cause harm to people or animals who come into contact with them.

A final benefit of fiberglass insulation is that it has low energy costs because it keeps rooms cooler during summer months as well as warmer during winter months which means less energy usage overall.

Rockwool Insulation

Rockwool Insulation

Rock wool is another great alternative for spray foam insulation because it’s a good choice for soundproofing. It’s an eco-friendly product made from melted basalt rock, which is then spun into fibers and pressed into boards. 

It’s fire-resistant and water-resistant, so it can be used in places where there are high temperatures or high moisture levels.

The benefits of rock wool include:

  1. High R-value (R-value measures how well a material resists heat flow): Rock wool has an R-value of 6 to 7 per inch.
  2. Eco-friendly: Rock wool is manufactured using renewable resources such as basalt rock, which can be found in many parts of the world.
  3. Moisture resistant: Because rock wool is made from stone that has been melted down, it doesn’t absorb water like other insulation materials do—which means it won’t rust or decay over time. It also makes it easier to install than other types of insulation because you won’t have issues with mold or mildew growing inside your walls after installation has completed.

Acoustic Foam Insulation

Acoustic Foam Insulation

If you’re looking for a soundproofing material that is easy to install, cost-effective, and will last a long time, acoustic foam insulation could be the solution you’ve been looking for. Acoustic foam insulation is made from a closed-cell polymer that absorbs sound as it travels through the material. 

This means that if there is any noise coming into your home through the walls or ceiling, it will be absorbed by the foam and reduced in volume before it reaches your ears. This can help reduce noise pollution and make your home more comfortable to live in.

Acoustic foam insulation is easy to install because it has no adhesive backing or special tools required for installation. 

It simply needs to be cut into smaller pieces if needed, then applied directly to the surface of a wall or ceiling using glue or staples. This makes it easy to work with no matter what kind of DIY project you’re working on.


No, spray foam insulation is not good at soundproofing. If you’re looking to soundproof your space, spray foam insulation is probably not the best option for you. You can reduce some noise with spray foam insulation, but it won’t be enough to make your space completely soundproof.

Spray foam insulation does not provide a significant advantage for sound quality. It is also very expensive. The major benefit of spray foam insulation is thermal insulation, providing the ability to keep rooms both warm in winter and cool in summer. But if you’re trying to reduce or eliminate noise, cost isn’t the only factor. 

Frequently Asked Questions (Is Spray Foam Insulation Good for Soundproofing)

What type of insulation is best for soundproofing?

The best insulation to soundproof a space is fiberglass. It’s lightweight, easy to cut and install, and it doesn’t absorb moisture. As long as you have the right kind of insulation in place, you’ll be able to make your home or building more soundproof in no time.

Rockwool is the best type of insulation for soundproofing. It’s made from molten rock, and it’s been used by the construction industry for decades. It’s a great choice for soundproofing because it absorbs sound waves, so they don’t bounce off the surface of your wall and right back at you.

Is expanding foam good for soundproofing?

Expanding foam is a good option for soundproofing, as it is able to absorb sound waves and reduce the amount of noise that travels through walls. Expanding foam can be used in many different ways, including to help insulate your home and keep sound from escaping or entering your home.

Does closed cell spray foam block sound?

Closed cell spray foam does provide some sound absorption, but it is not effective enough to block out noise like a wall or ceiling. The foam is more likely to provide a quick and easy solution for reducing sound in specific areas, like the room below your home theater.

Is foam a good sound barrier?

Foam is a good sound barrier because it’s soft and porous, so it absorbs the sound waves that pass through it. It also reflects some of the sound away from your house, which means that you’ll be able to hear less noise outside at night.

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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.