Green Glue: Does it work For Soundproofing?

If you’ve ever looked for ways to soundproof a room, chances are you’ve come across Green Glue. It is the most widely used adhesive for soundproofing projects. However, for those without much soundproofing knowledge and experience, the question usually arises, “Does Green Glue work effectively as a soundproofing solution?

The quick answer is YES!  Green Glue, an acoustic sealant brand, is unquestionably worth the investment. It is excellent at dampening low-frequency sounds in addition to sealing tiny gaps in materials through which sound waves can pass. This is accomplished by turning them into heat energy.

However, it is vital to realize that Green Glue is only one of many crucial factors you must take into account while soundproofing. The crucial factors could be the number of layers of drywall, the place where you want to apply the Green Glue(doors, windows, etc.), and so on. If these factors are not taken care of, you may be disappointed with the outcomes.

In this article, let’s discuss all about Green Glue and what could be its best alternatives. Keep reading the article to find out more.

How does green glue work and how much do you need?

You must have a basic understanding of sound wave energy and propagation to understand the science behind the Green Glue.

Like a wave or airborne vibration, noise travels through the air. When these waves strike a wall or ceiling, the vibrations travel through the structure and reappear on the other side as sound once more, unless the structure is dampened. Watch this YouTube video to understand further how green glue works.

source: soundproofing store

Green Glue damping compound contains a one-of-a-kind polymeric composition that converts mechanical energy from sound waves into heat energy. When this compound is layered between two rigid layers of material, it creates a damping system. As a result, when sound waves propagate through the damping system, the energy is released as heat.

It is recommended to use two tubes of Green Glue for every 4′ by 8′ space, or two tubes per ordinary sheet of drywall. If money is not an issue, using three tubes per sheet will enhance performance. 

About 192 square feet can be covered by one case of Green Glue, or 128 square feet if three tubes are used. However, use no more than three tubes per 4′ x 8′ sheet because using more than three tubes will harm the performance of the glue and worsen it. 

To purchase Green Glue, you can visit Amazon and browse through the various options.

How much STC does Green glue add?

STC ratings are a well-known method of determining how much sound is absorbed by building materials, windows, doors, and walls for example. In both residential and business spaces, higher STC ratings indicate better sound isolation. 

A high STC rating, like 60, indicates that less noise is transferred from one room to another. When compared to alternative noise-proofing choices, Green Glue Noise-proofing products have high STC ratings at a minimal price.

stc rating chart green glue
source: acousticalsurfaces.com

Green Glue does not have a single STC rating. Instead, the compound raises the building assembly’s STC rating. Let’s understand this with two examples.

Example 1: When 1 tube of Green Glue is applied between two layers of ⅝” drywalls on each side, STC=52.

Example 2: When 2 tubes of Green Glue are applied between two layers of ⅝” drywalls on each side, STC=62.

Which is better, Green Glue or Mass loaded vinyl?

Although Green Glue and Mass Loaded Vinyl are both utilized as “soundproofing” materials, they are not technically competitors. Green Glue is a viscoelastic damping material that is applied between layers of drywall to significantly reduce vibrations. 

While MLV is a thin, flexible barrier made of a dense, yet malleable material, it is designed to obstruct sound transmission and stop sound from passing through the barrier. Using them in conjunction is the best way to achieve the desired output.

Due to the fact that these products follow two different principles to block sound, the comparison between Green Glue and Mass Loaded Vinyl is somewhat flawed. 

But in case they are compared, mass-loaded vinyl improves wall performance, however, it performs significantly worse than Green Glue, particularly at low frequencies. Compared to MLV, Green Glue is also more affordable and easier to use.

How long does Green glue take to set?

The green glue must be allowed to dry for 48 hours before you start painting it or finishing it. However, allowing it to dry for 30 days will help you to achieve the optimal sound isolation performance.

 It never truly dries entirely and always has a slight fluid consistency, which is necessary for it to function.

The amount of time taken also depends on the climate you’re in; in cold, wet climates, it may take up to 90 days for the compound to set.

Is Green Glue permanent?

No! Green Glue is not a permanent adhesive and can prove to be effective for a period of one year only. However, a lot of individuals have said in their web testimonials that if you keep it cool and out of the sun and heat, it can last for 5 to 6 years before going bad!

Examining the consistency of the glue is the best approach to determine whether it is safe to use. If it is clumpy, it has gone bad; however, if it is clear and free-flowing, it is still good to use.

source: Soundproof Guide

How to apply?

The compound is placed in between two layers of construction material, usually at least 1/2 inch thick drywall, cement board, MDF, or plywood. It is necessary for moisture to be able to enter through one of the layers. 

The noise-proofing compound will work effectively if the two sheet layers are flat and rigid.

Green Glue shall never be used between soft layers, glass, plastics, or metals – for example, between a carpet pad and plywood – or to fill cavities for insulating purposes, such as inside a wall.

Since the Green Glue only works at room temperature (about 65–85°F/18–29°C), it is not advisable to be used for external applications. Exteriors frequently experience temperature swings that are both below and above this range which restricts the Green Glue from working effectively. 

Green Glue Alternatives

Anti-vibrational noise proofing is not limited to Green Glue sealant. Here are some other products that successfully block the transmission of sound through constrained layer dampening.

To Wrap It Up

In conclusion, Green Glue is undoubtedly a worthwhile purchase. It isn’t a miraculous solution, but it is a necessary step in the soundproofing process. It adds the final layer of sound dampening, making it one of the best ways to complete a soundproofing project.

FAQs

  1. Is green glue flammable?

No. Green Glue passed the fire test and can be used in fire-rated walls without having an impact on the wall’s rating.

  1. Is Green Glue toxic?

No. Water-based Green Glue is non-toxic, non-carcinogenic, and has a very low VOC content. Before using Green Glue, as with any products—paints, glues, and the like—take the necessary safety precautions and review the MSDS.