Soundproofing spray foam is one of the most popular soundproofing materials used by DIYers today. A lot of people like to use soundproofing spray on home improvement projects because it is so easy to use. Plus, it’s super affordable, and you can get it from any hardware store or order it online.

soundproof spray foam for wall

You can choose from many soundproofing spray polyurethane foam insulation brands. See the three best brands for soundproofing and wall insulation below.  

What is Spray Foam Insulation?

Before you start choosing random home insulation or soundproofing options to soundproof your walls, you should first consider whether you will need closed or open-cell spray foam insulation.


SPF or Spray polyurethane foam insulation is a type of plastic that you can use to fill small gaps and seal cracks and hollow areas you want to seal.

Here are two types of spray foam that you can use for soundproof insulation, attic insulation, and thermal insulation:

Closed Cell

Closed-cell foam is a rigid and much more stable type of spray foam. As its name suggests, closed-cell foam sprays are designed to be so dense that the cells are pressed together tightly to prevent moisture or air from getting inside the cellulose insulation foam.

Open Cell

An open-cell foam spray, on the other hand, is designed with cellulose insulation that isn’t completely closed.

Small bubbles are present inside the foam, making open-cell foam a more appropriate option for flexible surfaces.

Does Spray Foam Insulation Reduce Noise?

Now that you have an idea whether you should get open or closed-cell spray foam to achieve soundproof walls in your home, you should also consider the different noise reduction capabilities of the spray foam you will get.

Next Read: Soundproof Foam for Windows – (5 Things you should Know)

Spray foam is a very common soundproofing material for DIY home projects. But to get the best acoustic foam that can provide you with enough acoustic insulation, you should make sure you get one with high STC ratings.


Even though spray foam generally makes for good soundproofing and insulation, not all types of spray foam have great noise reduction or soundproofing capabilities.

An open-cell spray foam, for one, has an STC rating of 39; this is the same rating for your standard fiberglass.

What are the advantages of soundproofing spray foam?

Even though there are soundproofing spray foam alternatives with a higher STC rating, spray foam insulation is still a great option because of its additional thermal insulation properties.

When you decide to soundproof walls with spray foam, you get an additional layer of thermal insulation as well.

Another advantage of using spray foam for soundproofing is that it helps keep your walls dry and warm because of the air-tight seal it provides. This is also why it is great to use in colder and damper locations.

Best Soundproofing spray foam for existing walls Review

Already figured out the type of spray foam you need for your existing walls? Here are three of the best spray foam brands you can buy online today.

Next Read: Soundproof Padding for Walls – 5 Important Facts You Should know

1. Great Stuff PRO Gaps and Cracks – Fireblock Foam Insulation Sealant


Why You Should Get This:

  • Can fill 3-inch deep gaps and cracks with ease
  • It is easy to assemble and ready to use out of the box
  • It provides a water-resistant and fire-block seal
  • Great for plumbing, electrical, and soundproofing
  • It can be used on masonry, wood, metal, glass, and plastics
  • It is easy to put away and use next time

The Great Stuff PRO Gaps and Cracks foam insulation sealant is a smart choice for large home improvement projects.

It comes with a resealable gun that you can use to dispense the foam sealant anytime you want. You can take breaks without having to worry about having an open spray foam can.

The gun system helps you save on spray foam waste and is easy to direct at small gaps and cracks that need sealing.

If you are looking to fill gaps as deep as 75mm or 3 inches, you can use the gun to apply the foam to the deepest parts of the gap.

This is also a smart choice for materials like plastics, glass, masonry, metal, and wood.

Right off the box, you can pop off the spray can’s cover, screw it onto the gun, and start sealing cracks and gaps! No hard assembly is required. When you’re done, you can just close the gun valve and have it ready for your next use.

2. Seal Spray Foam High-Performance Closed Cell Insulating Foam

This Seal Spray foam is another smart choice for insulating between wall gaps against cinder blocks, soundproofing, and small and large insulation jobs.


What makes this a popular choice among today’s DIYers is how it makes sealing gaps in your home hassle-free.

To use it, all you have to do is apply the sealant directly to the gaps in your walls with the spray nozzles attached to the can.

A single 27.4-ounce can cover up to 12 by 12 inches and 1-inch thick gaps.

Why you should get this:

  • It comes in a compact design.
  • It is great for both small and large jobs.
  • It can be used for thermal and sound insulation.
  • One can cover 12″ by 12″ by 1″ thick gaps.
  • It is very affordable.
  • It is simple to use.
  • Comes with a seal cleaner.

With this sealant at your home, you get to save on sound insulation installation costs because of its high coverage and simple assembly.

It also comes in a compact design that makes it great for smaller spaces since you won’t have to bring a tank disposal with you.

If you have a helper with you, you can also use this for multiple sprays at the same time.

Lastly, this sealant can be used for insulation or soundproofing on all sorts of surfaces, including ceilings, walls, floors, and roofs overhead. It even has

3. DAP 7565002600 Touch ‘n Seal

If you feel like you will need a spray foam that you can use to maintain gaps and cracks all year round, you may want to consider this Touch n’ Seal spray foam.


The Touch n’ Seal spray foam is a smart choice for long-term home soundproofing plans because of its long shelf life. You can seal small gaps and cracks in your home and just store the remaining sealant away for the next time you need it.

Why you should get this:

  • It has a closed-cell structure for the best soundproofing results.
  • Class A fire rated.
  • Doesn’t shrink.
  • Compatible with most fiber insulation systems.
  • Compatible with Stone wool and Cellulose fiberglass.
  • Has low global warming potential.
  • It has a 30-60 second dry time and only has a 1-hour cure time.
  • It can be used in residential, commercial, and transportation structures.
  • It has a 1-year shelf life.

Another benefit of using this product is you don’t have to spend too much time maintaining the gaps it seals. The closed foam structure makes it more sturdy and less prone to settling and shrinking.

Using this sealant to soundproof your existing walls also adds fire protection to your home since it is Class A fire rated.

If you’re looking to ultimately soundproof your existing walls with other types of insulation, you can use this sealant very well with stone wool and cellulose fiberglass as well.

What are your options for soundproofing existing walls with insulation?

If you can’t get your hands on soundproofing spray foam, other smart alternatives you may try include:

  • Drywall
  • Soundproof Paint
  • Acoustic Foam Panels
  • Soundproof Curtains
  • Mass Loaded Vinyl
  • Acoustic Tiles
  • Acoustic Blankets
  • Stone Wool

Should you choose injection or spray foam insulation for dampening sound?

Spray foam insulation is a common sound-deadening material because of its ability to prevent air from flowing through gaps and cracks in walls, floors, ceilings, and on wooden, metal, plastic, or glass surfaces.

Because of this, sprayed polyurethane foam has become a go-to soundproofing material for offices, garages, bathrooms, commercial spaces, and even transportation structures.

Should I invest in professional spray foam insulation?

If you are looking to renovate or improve your home by yourself, spray foam is a smart DIY option you can invest in. They are quite affordable and can provide your home with multiple benefits, including thermal insulation, sound insulation, and even additional fire protection.

Can foam spray be used to reduce sound in rooms with cathedral ceilings?

Spray foam can be great for reducing sound in any room. Even when you have cathedral ceilings, you can take advantage of a spray foam’s insulation properties to deaden or absorb sounds in the room. Just make sure to choose spray foam that works well with the material of your ceiling.

Can you add spray foam insulation yourself?

Yes, spray foam insulation is a popular DIY choice for people looking to add insulation or soundproofing to their homes. Most spray foam kits come complete with applicators and foam cans that you can assemble within minutes and use to directly apply foam to the gaps and cracks you want to seal.

Before You Get Going

Remember, the key to being smart when it comes to choosing the best spray foam for your soundproofing project is checking for the right features and soundproofing ratings that come with each product.

Choose soundproofing spray foam kits with high STC ratings for the best soundproofing results. Also, consider the kit inclusions when buying a spray foam kit to avoid needing to spend more on separate items needed for your project.

Robert Castelao

Robert is an electronic engineer with more than five years of experience with a solid affinity for helping people reduce noise. He writes about these silent home appliances and easy soundproofing measures to help everyone avoid the negative effect of extended exposure to high noise levels.

Similar Posts