Had enough of the noises coming from outside making their way through the wall to disturb your quiet time?
Trying to find a solution to block the sound out, but you have no clue how?
There are plenty of soundproofing solutions to choose from, and acoustical sealant is just as effective in filtering out the noise and sound from another room!
We’ll be showing you our recommended sound sealant brands for you to try, plus some very important tips on how they work and how to use them!
Best Acoustic Sealant to Reduce Sound Transmission
1. TMS Acoustical Caulk
- Comes in a 28oz plastic tube
- Seasonal freeze-thaw and mildew resistant
- White latex-based caulking consistency
The first acoustical caulk on our list, and our highly recommended brand worth trying out, is the TMS Acoustical Caulk from Trademark Soundproofing!
TMS works excellently in preventing sound leakage and air movements from coming through the gaps such as where the walls meet, as its non-toxic, latex-based sealant compound stays flexible for even longer periods.
They reduce sound transmission and mid to high-frequency vibrations from drywall to plaster and even rougher surfaces like concrete and metal.
Available as a 290z tube, they’re non-flammable, mold-resistant, and environment-friendly!
Plus, if you purchase this one, you could get a sweet deal and adequate sound sealing at a reasonable price!
- Can adhere to the drywall, concrete, wood, and metal surfaces
- Non-toxic and doesn’t shrink, crack, or dry out
- Decent sound absorption
- Cannot be used around hot pipes or ducts
- Not paintable until fully well cured
- Caulking may be hard to control sometimes
2. St. Gobain Green Glue NoiseProofing Sealant
- Ideal for electrical boxes, doors, and windows
- White-colored, gooey compound
- Cures for up to 48 hours
The Green Glue NoiseProofing Sealant from St. Gobain is our top premium acoustical sealant, perfect for those who want high-quality soundproofing at a price that reflects it!
In fact, we even have a full guide on alternatives to Green Glue if you’re interested.
When used on gaps and seams as wide as a quarter-inch, it becomes pliable and elastic, effectively deadening out low-frequency sound waves and a wide range of noises through the wall in only a matter of minutes.
It emits lesser to no unpleasant smells, can be taped and mudded over, and is versatile on almost every surface, including the vapor barrier.
Like our overall top pick, the Green Glue Sealant is non-toxic, mold and mildew-resistant, and just as stellar when reducing noise transmission!
The Green Glue caulking sealant is sold in 28 fl. oz tubes.
- Emits little to no unpleasing odor
- Seals gaps and cracks very quickly
- Improves STC levels on the wall
- Price range is expensive at twice most sound sealants
- Limited color choices
- Not recommended for around plumbing pipes and exterior applications
3. Big Stretch Sashco Caulk
Best Budget Pick
- Adheres to surfaces very well
- Can stretch more than 500% of its original size
- Comes in 10.5oz and 29oz cans
If you’re on the lookout for a superb sound sealant that won’t break your bank, stop searching — the Big Stretch Sashco Caulk could be for you!
This sealant, sold at a surprisingly low price, adheres to surfaces effortlessly, and its elastic compound can stretch over time in any season, at way beyond 500% of its original size!
A great advantage of using a stretchy and durable soundproofing sealant is that surfaces may remain air- and water-proof, even after many more years.
It can be used for sealing gaps in the windows, doors, vents, and interior walls. It can also be used as crown molding.
In short, the Big Stretch Sashco Caulk is, without a doubt, very outstanding for a low-priced sound sealant, and that’s why we chose this as our budget-friendly pick on our list!
- Easy to apply and clean, even on delicate surfaces
- Clears as it dries and is paintable
- Very flexible and durable
- Not designed for water exposure at longer periods
- May dry very slowly
- Thin and runny consistency
4. Auralex STOPGAP Acoustic Sealant
- Covers 32 linear ft. with a 3/8″ bead and 80 ft. for 1/4″
- Waterproof, non-staining, can withstand fire
- The formula stays pliable for better soundproofing
The Auralex STOPGAP sealant has a water-based, white-colored formula that helps seal out the cracks and gaps on the walls, windows, ceilings, etc., from sound leakage while staying elastic and tensile.
You may be asking, “how effective is it when applied?” The STOPGAP can improve the STC rating of a normal house to around the score of 53 during construction.
This sealant is not just stretchable but also resistant to stains, flames, and other outside factors!
It’s also not too gooey to the point where it would run off the gaps that are sealed around.
However, the application might come off as a bit messy, so you would need to watch that out should you consider purchasing this.
- Flexible and durable at the same time
- Guaranteed no run-off or slumping
- Helpful in decoupling partitions
- May not adhere well to a few surfaces
- Messy application
5. Liquid Nails Acoustical Sound Sealant
- Can seal gaps up to 86 linear ft. with 1/4″ bead and 40 ft. for 3/8″
- Ethylene-vinyl acrylic water-based latex formula
- Sealing will cure within 24 to 72 hours
From the brand known for its reliable adhesives and hardware, Liquid Nails offers its own Acoustical Sound Sealant (AS-825), a soundproofing caulk that is just as solid as our other picks on this list!
Like the rest of them, it is non-hardening, non-flammable, and VOC compliant. It also adheres to most surfaces and building materials except for non-porous surfaces like plastic.
Applying it into any gap or crack between the floor or wall and around lighting boxes with this water-based formulation helps seal against any sound transmission.
This AS-825 sealant is available in 28 fl. oz cardboard tubes and can be sold solo, in sets, or boxes of 12.
- Can adhere to most materials
- Tack-free in 20 minutes with a faster drying rate
- Safe for your health and durable
- Will not stick to non-porous material such as PVC
- Not as thick as other brands
6. Tremco Acoustical Sealant
- With a gray composite polymer compound
- Available in a 24.7oz tube
- Can improve STC rating up to a score of 60
Tremco’s Acoustical Sealant can seal out any sound from the outside like the rest of our caulk sealants.
However, the main difference is that it absorbs the noise a lot better, with the STC rating ranking up to 60.
Its distinctive polymer formulation sticks to nearly every building material and surface, from drywall to wood, and does not harden or crack as it’s designed to stay viscous and pliable.
Available in a generous 24.07 tube, the Tremco Acoustical Sealant is a great acoustic caulk that may be practical and handy to use in a soundproofing project.
- Can seal and adhere to any material from drywall to metal
- Remains tacky and viscous, resulting in better sound dampening
- Heavy-density with exceptional adhesion
- Messy application
- Emits a strong odor compared to other brands
What Is Acoustic Caulk/Sealant?
An acoustic caulk or sealant is a solid soundproofing solution specialized to absorb sound and noise coming from outside environments and other rooms through the wall.
The integral compound formulation found in most acoustic sealants may be water- or latex-based, but a couple of things commonly shared between them are that they’re non-toxic, non-flammable, freeze-thaw stable, and can stick to most construction materials from drywall to concrete and even to metal.
Acoustic caulk is characteristically flexible, adapting to shifts and changes within the building’s foundation, from seasonal expansion behind the wall to the contraction of materials.
There are plenty of advantages when it comes to the flexibility of the acoustic sealant:
- It’s permanent, so over time, the effectiveness remains no matter how much it will experience fluctuating stress.
- The flexibility of the sealant makes it more beneficial in blocking out sound transmissions that may come through the cracks or gaps.
- They’re durable; most acoustic caulks do not dry out or harden, shrink smaller than the original application, and lose their adhesiveness with another surface material after time has passed.
- They’re paintable, especially when the formulation is cured, and can be taped over, too.
What’s the Difference Between Acoustic Caulk and Regular Caulk?
A regular caulk and an acoustic caulk may look and operate the same, but don’t be fooled!
Some features distinguish one from the other, and that is what we’re going to deal with in this section.
To start, a regular caulk is a handy construction tool used to fill gaps on the wall, floor, or anywhere in a building to seal out the air that may pass through.
An acoustic caulk sort of operates the same: Not only does it work in sealing openings to stop the airflow, but it also helps in reducing sound vibrations caused by that kind of movement!
That’s something any regular caulk must be missing!
Aside from that, the acoustic caulk is flexible, non-hardening, and holds stronger than any regular caulk.
What do we mean by “stronger than any regular caulk“?
Unlike any acoustic caulk, the seal of a regular caulk dries very quickly and will shrink or crack over time. To make matters worse, it will need to be replaced more frequently than the acoustic caulk, which usually stays longer at an average of five years.
To think it into perspective, in terms of applying a sealant to a vapor barrier, for example, the regular caulk fares much less than the acoustic sealant!
Most regular caulk sealants also contain more chemicals that might pose concerns to one’s health. However, they’re generally mild irritants, plus the odor they emit may come off as worse compared to most acoustic caulk tubes, which may contain lesser to no toxic elements.
Where Can You Use Acoustical Caulk?
There are different types of caulk appropriate for different parts of the construction, and so with that in mind, the acoustic caulk is suitable to use in every crack or gap between the wall and drywall or any small opening where air and sound vibrations usually pass through.
It can be used to seal perimeter joints between two materials, between the panels, walls, floors, and ceilings.
It can also seal around the windows, doors, electrical boxes, and other outlets that may be prone to air and noise transmission, including that pesky, annoying flanking sound!
Acoustic sealant is an ideal permanent fixture in any soundproofing project, residential or commercial, but there is a downside, as with other caulk sealants.
IMPORTANT NOTE: Acoustic caulk is not recommended in underwater applications, or simply speaking, in places more prone to constant water exposure, such as in the shower walls or bathtub or a bathroom or kitchen sink.
At this point, it’s better to use a regular silicone sealant instead.
Things to Consider Before Using Acoustic Sealants
When buying an acoustic caulk or sealant, you must consider these factors first:
Will It Adhere to Certain Materials?
Some sealants may adhere to a wide material range better than others, while some may not stick at all or, worse, might be too harsh to other elements that they can dissolve!
It’s important that you would need to READ THE LABEL FIRST and check which material is compatible or not.
Is It Necessary to Use in a Soundproofing Project?
While acoustic caulking is an effective way to reduce sound, it doesn’t necessarily mean it’s the only way to exist.
There are many soundproofing and sound absorbing options to use during construction, such as isolation clips, acoustic pads, resilient channels, drywall sheets, and insulation.
While caulking is useful most of the time, there may be some parts that don’t see it as important or suitable, in which case the rest of the options come to play.
Which Compound Ingredient Is Safer?
The mixture of an acoustic caulking sealant may come as silicone-based, latex-based, or water-based.
Having a water-based sealant is more convenient on the user’s end because it is easier to clean up, is non-toxic, often mold- and mildew-resistant, emits less odor, and generally poses less harm.
A silicone- or latex-based sealant, in comparison, may include a few chemical ingredients that might irritate one’s skin or, in other cases, sense of smell.
Is It Durable Against Water and Other External Factors?
It’s been established that most acoustic sealant caulk tubes are not ideal for underwater application, but did you know some are waterproof?
One may be designed and marketed as waterproof, working better around wet areas, and could compete with other caulking solutions that deliver the same promise!
There are also acoustic caulking sealant tubes that are advertised for interior-exterior compatibility.
Does It Come in Different Colors? And Is It Paintable?
Acoustic caulk solutions come in different colors ranging from plain white to grey to black to even brighter hues such as green and yellow!
Most sealants, especially in white and other lighter hues, can be covered in paint to be distinguishable, although there may be others that do not allow to be fully immersed in paint.
How Much Does It Usually Cost?
The main difference in an acoustic caulking sealant’s price depends on the overall quality, ingredient mix, and the size of the tube, including how much coverage it will extend.
There are plenty of cheap ones costing less than $10, while others are sold at over $20, especially if the compound mixtures used are high-end.
Per 28 or 29 fl. oz tube, most caulking solutions usually cover 85 linear feet with a quarter-inch bead or 40 ft. with a 3/8″ bead.
With this taken into consideration, the more expensive the cost of an acoustic sealant is, the more careful you may need to be when applying certain amounts to any surface and vice versa.
How to Apply Acoustic Sealant Properly
Using an acoustic sealant in your soundproofing project during construction has proven to help a lot in reducing noise transmission, as it increases the sound transmission class (STC) rating, ensuring a more quiet environment!
Caulking an acoustic sealant is a simple process, and it only takes around 30 minutes to get it done.
Here is a comprehensive guide on how to apply the sealant!
Step 1: Prepare the Room and Surface
Before application, you would first need to make sure that the room where you would be applying the acoustic caulk is well-ventilated.
The smell may be overpowering to your nose, so be careful and protect yourself as much as possible!
At the same time, make sure that the surface you would be applying the sealant on is clean and free from dirt, dust, moisture, and other debris that may get in the way.
If the edges of the gap are rough, trim with a utility knife to ensure a smoother application.
To create clean bead lines around the walls, doors, windows, the floor, and the ceiling, put tape slightly above where they will be applied.
Step 2: Cut the Nozzle Open
To create a hole in the nozzle of the caulk, you may cut it open at an angle with sharp objects like a utility knife or scissors, depending on the gap width that you would want to seal.
The recommended bead diameter of the opening falls between 1/4″ and 3/8″, perfect for any gap or crack between the walls, etc.
Alternatively, you may also create the hole by using the tip cutter of a caulking gun and its built-in long wire pin to puncture the foil, letting the sealant flow freely.
Step 3: Load Onto the Caulking Gun
The caulk is hard to squeeze even with human hands, so the best way is to load it onto the caulking gun.
The caulking gun may come as either a ratchet rod, smooth rod dripless, or electric.
The first retains its pressure even after the handle is released, and the second uses twice as much pressure but only when the trigger is released.
An electric caulking gun is self-explanatory — it’s much easier on the hands!
Step 4: Apply the Sealant to the Gaps and Cracks
Once the canister is locked and loaded, you may now start filling it into the gaps and cracks between each wall, floor, or ceiling, cut-outs, perimeter joints, and other openings that may need sealing to block out sound transmission.
- For half-inch large gaps and cracks, it’s best to use a backer rod before filling to ensure a more secured sealing.
- For doors, windows, electrical boxes, and HVAC openings, fill in with two layers of beads or more for a complete seal.
Use a cloth, paper towel, finger, or any of the caulking tool kits to smooth the beads within 15-30 minutes before it becomes fully cured.
During application, make sure to review if the opening is thoroughly sealed; otherwise, there might be a chance that any air and sound transmission may leak through!
Step 5: Let the Sealant Dry
Once everything is done, let it dry between 24-72 hours or 1-3 days, depending on the brand used.
Ideally, most sealant caulks have an average drying time of 48 hours or 2 days; failure to do so may result in awful sound reduction.
After it’s been dried, you may paint it over or put layers over where you’ve sealed it.
Frequently Asked Questions
Is Acoustic Caulk Removable?
Acoustic caulk is mostly easily removable between the walls and other crevices, but the type of sealant compound used may affect how it is removed.
If it involves a solvent-based sealant, they are cleaned off with mineral spirits.
With water-based ones, they are easier in comparison, making use of only soap and water.
Is Acoustical Sealant Waterproof?
There are a few caulk tubes designed to withstand constant water exposure.
However, they are of higher quality compared to a regular sealant and tend to be priced at more than $20.
Can You Plaster Over Acoustic Sealant?
A few acoustic caulk may be too runny to the point where they cannot be put on with plaster or paint, but, thankfully, in most cases, they can be plastered or painted over the perimeter as it helps in completing the seal.
We hope this guide gave you ideas to help you prepare for your next project!
Acoustic sealants enhance the soundproofing experience by a mile, and we cannot recommend you to use them enough.
To go over a quick review:
- For those who want a premium quality caulk, the Green Glue NoiseProofing Sealant is worth trying out.
- And for the Big Stretch Sashco Caulk, it’s arguably everything you need for only less than $10!