Soundproof Acoustic Sealant caulk
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Soundproofing your home theater or media room properly is more than just throwing up some acoustic panels. It also requires that you seal all the spaces in your walls, to limit the amount of sound going through them.

This is very important because sound can leak through any available openings, even a small crack can allow a significant amount of sound to pass. For example, sealing and soundproofing your home theater windows is very important for an overall good audio experience.

However, regular soundproofing materials may not be very effective for sealing cracks, especially if you want to . Luckily, you can get the job done with an acoustical sealant, also known as acoustical caulk or soundproof caulk.

acoustic caulk

As one of the final steps of soundproofing your home theater or media room, sealing the seams with acoustical caulk is an important yet cheap and simple process.

What is Acoustical Caulk?

You may ask, why not just install some soundproof drywall or use soundproof curtains and be done with it? well, even if you do that, you will miss the tiny openings in your around your windows, door frames and so on.

Yes, you need to soundproof your home theater doors and you need to soundproof your home theater windows as well. Doing both will ensure better sound quality in your home theater and acoustic sealant is great for both!

The best way to seal those gaps properly is to use a good acoustic sealant.

So what is acoustic sealant caulk?

Acoustical caulk is a great soundproofing product that is in some ways similar to an ordinary sealant.

Acoustic Sealant caulk

We say similar in some ways because there are distinct differences between the two products.

Acoustical sealant has the capability to permanently retain its flexibility, allowing it to work effectively for a very long time. You can think of it as a non-hardening caulk.

what is acoustic sealant

A hardening caulk is quite poor at soundproofing since it can shrink and eventually crack. The film can also separate, leaving the seams unprotected against sound leakage.

However, you can use an acoustical sealant to ensure that no sound can go through your walls, even after a very long period.


Where Should I Apply Acoustical Sealant Caulk?

For effective soundproofing, you should apply acoustical caulk on any place where there is a joint between two soundproofing materials.

That means that you can use soundproofing sealant on the joints between your walls, on seams between adjacent drywall panels, on spaces within your ceiling, gaps and cracks within your windows and even on the floor.

You should always apply your sealant before finishing elements such as crown mounding and plates are installed.

applying acoustic sealant

Simply put, acoustical caulk should be used to seal all the cracks or spaces on your soundproofing surface.

In addition, you can also use it around electrical sockets, doors, and windows.  After applying the sealant, you may apply tape and other products.


Buying Acoustical Caulk

With many brands of acoustical caulk available on the market, it can be a bit tricky to choose something that suits your needs.

The most important consideration when choosing a sealant is that you will need to apply it generously on the area it is needed.

Buying Acoustical Caulk

You should literally leave little to no space for sound to pass. That means that you may want to choose a cheaper product if you are working on a tight budget.

If you are on a budget and you choose an expensive sealant, you might be tempted to apply just a little to your cracks and openings.

This is a serious mistake. It’s much better to purchase 2 less expensive sealants than one expensive one so that you can apply is as needed.

As long as you purchase acoustic sealant and not regular hardening caulk, you will be just fine.

Besides the price, other factors may affect your decision when buying acoustical sealant:

Where Can I Use Acoustic Sealant?

To start with, the solvents used in some products are not suitable to use around certain materials.

Not every product is good to use on furniture, for example. In fact, some products may discolor or even damage certain materials.

This means that you need to check the product before purchasing it, to ensure that it fits with your intended use.

Water Based Acoustic Sealants

If that’s still too much for you, then a water-based acoustic sealant will tend to be easier to work with. Moreover, they have little to odor. You can also clean them without any problem.

What Sealant Equipment Do I Need?

Due to the elasticity of acoustical caulk, it can be hard to squeeze out the sealant from the tube. If you’re not one of those ultra strong persons, this will be a problem.

Luckily, many of these sealants are sold with a workable application mechanism that allow you to easily apply the product and to fit in small cracks.

Can Acoustic Sealant Be Painted Over?

Depending on where you will be suing your sealant, you should consider whether it can be painted over easily.

If the sealant will be exposed, you will want to paint it, but not all sealant caulks can be painted.


How To Apply Acoustical Caulk

After buying a suitable acoustical sealant, you can easily apply it on your soundproofing surface, even without prior experience.

Best Acoustical Sealants

However, you should wear eye protection while handling the project. Here is a guide on how to apply the caulk properly:

  • Wipe all the dirt and dust on the soundproofing surface before applying the acoustical sealant.
  • Using a pair of scissors or a utility knife, cut the nozzle on the sealant to create a suitable hole.
  • Apply about a quarter or half an inch drop of the sealant and smear it on the crack to seal it.
  • Use the caulk on both sides going wall-to-floor, wall-to-wall an wall-to-ceiling intersections.
  • Liberally apply the sealant on any crack or opening formed by power sockets or other outlets on the wall.
  • Allow the sealant time to dry, before applying paint or other finishing products. This typically takes about 48 hours.


Five Best Acoustical Sealants

There are several acoustic sealants on the market. Choosing the right one can be quite confusing. Which one should you buy?

The one that says it’s the strongest or the one that says it will last longest? It’s confusing, which is why we have taken the time to round up 5 of the very best acoustic caulks on market.

With any of these, your home theater soundproofing project will be simple and easy. We also included the Amazon link for each product:

1. OSI SC-175 Draft & Acoustical Sound Sealant

With each tube covering about 85 linear feet when applied in ¼-inch beads, this product is suitable for hotels, offices and residential spaces.

The sealant has very little odor and you can clean it with soap and water, while still wet.  This latex-based caulk is also non-flammable, making it suitable for power boxes and other areas with a lot of heat.

2. Green Glue Noise Proofing Sealant

Available in 15-pound cylinders, this acoustical calk is easy to work with. It may be applied to a wide variety of spaces ranging from residential spaces to offices and even construction areas.

Green Glue Noiseproofing Sealant pack of 6 Tubes...
  • 6 Green Glue Noiseproofing Sealant Tubes w/ nozzles - each tube is 29 oz
  • Includes Specialty Cleanup wipes and TMS installation guide
  • Sound rated caulk - Seal penetrations and perimeter gaps from sound leaks

The product works best in low-frequency areas and it has a low odor when applying. You can also clean it with soap and water.

3. Red Devil 0606 Removable Sealant

Designed for interior and exterior use, this high-quality caulking product adheres to most surfaces and is highly durable.

Red Devil 0606 Zip-A-Way Removable Sealant,...
  • APPLY IN THE WINTER & REMOVE IN THE SPRING: Apply like a caulk before winter to seal out cold drafts and then...
  • PEELS AWAY EASILY: Simply peel and remove when no longer needed within 6 months
  • APPLIES & DRIES CLEAR: Dries to a flexible, rubber like seal

This product offers an excellent barrier against sound, insects, and dust. The sealant comes in a dark brown color which makes it great for painting over any kind of finishing material.

4. DAP Acrylic Latex Caulk, With Silicone

This premium quality product is mildew and moisture resistant, making it perfect for caulking around doors and windows.

DAP INC 18152 10.1oz White Alex Plus Acrylic Latex...
  • Color: WHITE
  • Manufacturer: DAP
  • Manufacturer Part Number: 18152

It is excellent for stones, wood, ceramics, glass, metal and other rough surfaces. It’s available in a brown color and you can be applied very quickly.

5. Sachco Big Stretch Caulk

This water-based elastic caulk has the ability to last a very long time, without cracking or tearing.

Sashco 10016 10.5oz 10016 Big Stretch Caulk...
  • Big stretch caulk, 10.5 oz., white - 1028277
  • This is highly durable
  • This is manufactured in United states

It’s suitable for both interior and exterior use. Better yet, you will have an easy time cleaning it.  This sealant comes in a range of about 13 colors.

Bottom Line:

To effectively soundproof your home theater room, it’s critical that you use a quality acoustic sealant to seal all the spaces between the door and window panels and other areas where there are cracks and openings.

Acoustical sealants provide a great defense against dust and sound leakages, allowing successful control of noise in your media space. Good luck with your soundproofing efforts!