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Acoustic Sealant: Does It Work and What Are the Alternatives

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Green glue sealant is a highly recommended acoustic sealant readily available on the market today.

Acoustic sealants are designed to create a seal that blocks unwanted noise from the outside or leaves the room.

Are you tired of endless sleepless nights because of the traffic noise or outside noise?

You may already be aware of the most common soundproofing materials such as sound-dampening curtains, foam panels, drywalls, or even mass-loaded vinyl.

In this guide, we shall be examining several acoustic sealant products available on the market and the complements.

What Is Acoustic Sealant

An acoustic sealant is one of the most affordable soundproofing materials, a specially designed sound-absorbing caulk that adheres/sticks to most building materials, including gypsum, wood, and concrete.

Most acoustic sealants are non-toxic, water-based, non-flammable, and freeze-thaw stable.

In other words, it’s a high-strength, flexible adhesive especially made for sealing gaps and perimeters where sound may escape.

The product is also used to dampen flanking vibrations and sealing holes.

The best part is that it permanently flexible, doesn’t shrink or harden, unlike regular caulk.

What Makes a Sealant an Acoustic Sealant?

For a sealant to quality as an acoustic sealant.

 Regular sealants with time dry and crack, unlike acoustical bonds that permanently remain flexible, don’t shrink or expand.

A regular sealant only blocks airflow but allows sound waves transmissions in the form of vibrations.

On the other hand, acoustical caulks convert sound waves into negligible amounts of heat.

A-List of the Best Acoustic Sealants on the Market Today

Now that you’re familiar with what sound dampening sealants are and how they work let’s look at some of the most recommended ones. Some of these products adhere to construction materials and a variety of automotive sound-deadening materials.

1. Green Glue Acoustic Sealant

Green glue acoustic sealant is a noise-proofing sealant used to fill joints and gaps where the wall meets the ceiling or the floor and where two walls meet.

It can also be used around switch boxes and other outlet boxes.

It’s an easy-to-install product that can be easily be painted using soundproofing paint, ideally after 48 hours.

Green Glue Noiseproofing Sealant improves the Sound Transmission Class (STC) rating, which is obligatory in LEED-certified structures.

Read my guide on determining the STC ratings of a wall all by yourself.

The best part is that the product is non-hazardous, doesn’t have odors, resists drying and cracking, and stays permanently flexible.

It helps block low, medium, and some high-frequency noise. However, it’s not for use in exterior walls, around water pipes, or plumbing installations.

You should clean up easily with soap and water before it cures.  

The sealant is available either in singles or sets.

2. Quietzone Acoustic Sealant

This product is designed to absorb sound vibrations within the walls cavity to control noise in your house.

It works by stopping sounds from traveling through small openings and cracks on ceilings and floors.

Manufactured by Owens Corning, this product provides an effective method to reduce noise transmission between rooms.

It also significantly reduces the noise coming around windows and exterior doors.

Because it can be used on exterior doors, this product makes a great alternative to green glue.

However, there are precautions one should take with Quiet Zone sealant.

It may cause eyes and skin irritations and is harmful when inhaled or swallowed.

You should avoid vapors or breathing and use it with adequate ventilation.

3. Liquid Nails Acoustical Sound Sealant

LIQUID NAILS Acoustical Sound Sealant is a flexible latex sealant designed to decrease sound transmission in any type of wall system.

The product passes ASTM E 90 for impressive acoustical properties.

It has also been tested as per ASTM E 84 for smoke generation and flame spread.

Just like green glue sealant, you can use liquid nails to seal around openings, and seams including electrical boxes, cutouts, perimeter joints, as well as soundproof windows, and any other areas where air may leak through.

4. OSI SC175 Draft and Acoustical Sound Sealant

This product helps damp sound transfer through walls, floors, and ceilings.

Additionally, it can be applied around panel and wall perimeters for air vent noise reduction and electrical and lighting cutouts.

Not only does it block sounds, but it also acts as a draft stopper.

It’s non-flammable, latex-based, whose primary function is to achieve and maintain improved STC ratings of the system designed.

The sealant is paintable and remains permanently flexible.

It adheres to metal studs, such as resilient channels, gypsum boards, concrete, and most building materials.

Uncured adhesive residue can be removed with just soap and warm water, while cured requires a sharp-edged tool to cut away.

5. Auralex Acoustics STOPGAP Acoustical Sealant

The StopGap sealant is a water-based elastic sealant used for reducing noise transmission around electrical box cutouts or at the perimeter of wall systems to achieve improved STC/MTC values.

The surface dries to form a tough film; however, the sealant remains flexible and also flexible for up to five times than competitor brands.

It has no residual run-off, it’s paintable, non-staining, and meets all ASTM E-84 standards for fire retardancy.

The product comes in a large 28 oz container and requires a larger than normal caulking gun that can be purchased online.

Acoustic Sealant Application: What’s Required?

Acoustic sealant application is determined by the magnitude of your soundproofing project.

It can be used alongside other sound-deadening materials to improve soundproofing efficiency and achieve higher STC ratings for walls.

Before application, make sure that the surface is clean, free of dust, dirt, and moisture.

You should use a knife or scissors to clean cracks and holes on the ceiling to ensure that they are free of dust.

Holes that are too small may not create an effective seal because it’s hard to fill with the paste.

Holes should be around ¼ to 3/8″ for the best application.

Apply the sealant to the hole or crack and wipe off the excess with a paper towel or a piece of cloth within 30 mins after application.

However, for cracks larger than 1/2″, you need a backer rod for filling with caulk.

Larger openings around electrical boxes, doors, and windows require multiple layers for a complete seal.

You should allow the sealant to cure before painting or installing an acoustic soundproofing wallpaper to improve noise reduction.

Acoustic Sealant

Acoustical Sealant Vs. Silicone

The main difference between acoustic sealant vs. silicone is that acoustic sealant retains permanent flexibility while silicone doesn’t.

Again, acoustical sealant adheres firmly to all building materials and stays permanently glued to the surface, unlike regular silicone.

Final thoughts on Acoustic Sealant

Acoustical caulking plays a vital role in blocking flanking noises transmitted through structures.

They retain flexibility and don’t dry hence aiding in both sound and draft blocking.

While there are various products on the market, my top recommendation is the Green Glue Noiseproofing Sealant.

The best part is that it meets all the criteria you’d wish for in a noise-controlling sealant.

Regardless of how sound travels, this product will get you sorted.

However, it’s always important to note that a sealant alone won’t make a room soundproof.

You should instead combine it with other soundproofing products.

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