TM Soundproofing About Green Glue Damping Compound

About Green Glue Damping Compound

What is Green Glue:

Green Glue is a visco-elastic damping compound. In simple terms that means that it dampens vibrations. The reason it is such a fabulous soundproofing material is because sound is an energy wave that travels by vibration. It travels through the air by vibrating air molecules and through walls and ceilings by vibrating them as well. (Actually sound travels faster through a solid than through air due to the fact that the molecules are closer together in a solid). The better damped a material is the quicker it will dissipate (disperse) the sound energy into heat energy, to keep it simple, it will stop the vibrations quickly.

Green Glue is the highest performing damping compound to have been lab and field tested on the market today. It works in a Constrained Layer Damping System, meaning that it is applied in between two rigid layers. In practical terms Green Glue is applied between two layers of drywall (walls and/or ceilings) or two layers of plywood (sub flooring) etc. The result is that the two layers are now one larger damped material which dissipates sound energy very quickly and efficiently. All factory damped drywall use a damping compound in the middle in order to achieve sound proofing characteristics. However with green glue you will get better results a) because it is a better damping compound and b) because you are applying it between two full layers of drywall so your wall/ceiling/floor is heavier than if you were using one layer.

Green Glue ApplicationGreen Glue Cost & Application:

Green Glue is cheaper than factory damped panels and is also a very cost effective material due to the fact that it very simple to apply saving on labor costs and there is no waste. When you buy a factory damped drywall or a material like Mass Loaded Vinyl you end up losing material that has to be cut and thrown away, whereas with Green Glue you only apply it to the drywall that is already cut to size. Green Glue doesn't need any tools other than a standard quart size caulking gun. (When using Green Glue Buckets use of a bulk caulking gun is highly recommended). It is applied using 2 tubes for every 4 x 8 sheet (1 tube for every 4 x 4). Any random pattern will do and a tube can be dispensed in 30 seconds. The drywall is hung, screwed into place and finished like any other standard drywall installation.

For actual installation hang your first layer of drywall then apply the Green Glue either on the face of the hung layer or on the back of the 2nd layer that you are about to hang (this is the most popular way). Screw the 2nd layer of drywall all the way to the studs. Green Glue does not work by decoupling or by creating an air space, so feel comfortable screwing the 2nd layer of drywall tightly to the 1st layer. The above applies as well if you are adding a 3rd layer of drywall with a 2nd layer of Green Glue (make sure you use longer screws that can reach the studs). This technique is also used when you are installing drywall on to Whisper Clips and Hat Channel, just make sure to screw into the channel in place of the joists.

Results:

A standard 2 x 4 wall 16" OC with 1 layer of drywall on each side has an STC rating of approximately 32. A double layer of drywall with Green Glue installed on one side of the same wall will give you an STC of approximately 45 (compare that to 2-3 points achieved with insulation, MLV or just another layer of drywall) a 2nd layer of drywall with Green Glue on the other side will give you an additional 4-5 points, bringing your wall up to a STC of about 50. On 24" OC studs or on metal framed studs you can achieve ratings of 56-59.

Do you still need more information about Green Glue? Give us a call at 845-388-1200.

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Customers Questions and Answers

1) Tatiana: I am using the green glue compound between 2 sheet rocks. Will it make a difference if I insulate my walls or not for sound dampening?

Trademark Soundproofing Reply: Yes it will make a big difference. When GG is applied there is less sound transferred through the stud work and more sound in the air cavities. The insulation there will help absorb a lot of that sound energy.

2) Melissa: Hi! I'm planning on doing two layers of drywall on our walls and ceiling in our living room with green glue to help with the noise of cars driving by with loud bass and a nearby highway. We are removing the existing cover (it's paneling) first and then doing two 5/8" drywall sheets with GG. However I'm not sure on two things. The first is regarding the windows - should the jamb and head be two layers with GG as well? What about the window sill? Second, with two layers we can move the outlets forward but what about the door to the outside? Any suggestions since the wall will be so much thicker? Thanks for the great site! I look forward to ordering my GG soon :) Thanks, Melissa

Trademark Soundproofing Reply: Hi Mellisa, If you can get double layer of drywall with GG on the jambs and header it will only make it better, otherwise it will be fine too,. Just be sure to seal all gaps with Acoustical caulk. As for the door jambs, there is something called an extension jamb for that ask your local contractor, same goes for the outlet boxes which can usually be adjusted quite easily. Thank You.

3) Emma: Hello, I spoke to someone the other day about our new construction. I know you don't sell it but what do you think of Quiet Rock - it seems it would be lighter and less labor intensive to install than green glue and double layering dry wall. Many thanks, Emma.

Trademark Soundproofing Reply: Hi Emma. The points you make are true. However the heavier and more mass you have the better it is for sound. Additionally when using 2 layers of drywall you can overlap the seams. Another advantage to using the GG is that you are sure to put on the correct amount of damping compound 1 tube for every 16 sf. Another advantage is actual damping properties of GG are the highest and best in the industry and finally there is no waste of expensive GG only of standard drywall.

4) John G: I run a car shop with a dynamometer. When the dyno is in use the noise can be quite loud. We want to use the MLV 2lbs for our outside fence and a mobile shield behind the car. What material can the shield be made of. We were thinking a wooden fence of 3/4" plywood with the MLV over the plywood. Also is 3lb of MLV (1lb+2lb) more effective than a 2" alone? Thank you.

Trademark Soundproofing Reply:

Hi John, that assembly should work. We also have specialty outdoor curtains you can use, see the link here. http://www.tmsoundproofing.com/Sound-Curtain-Heavy-Duty-Permanent-Applications.html

5) Pat: I am in an office with 1/2 drywall on 2x4 studs I can hear every word that is spoken in complete detail as if they were in the same office. Suggestions? (the sound seems to come through the walls and not the ceiling) thanks

Trademark Soundproofing Reply:

Hi Pat, You need to treat the wall and the ceiling. The wall would need a 2nd layer of drywall with Green Glue and the ceiling which would require the use of Ceiling Tile Barriers http://www.tmsoundproofing.com/Ceiling-Tiles-Sound-Barrier.html We will be posting a video in the next few weeks showing office soundproofing you can subscribe if you would like to be notified when it posts. http://bit.ly/subscribetmsoundproofing Thank You,

6) Karina: Dear TM, could you tell me, would a retrofit (i.e., add over existing indoor wall) consisting of GreenGlue + QuietRock layer added, be better, marginally better, or worse, than GreenGlue + Regular Drywall layer added? Thank you, Karina

Trademark Soundproofing Reply: Hi Karina, It would be marginally better.

7) Norene: Can you use drywall with green glue over existing walls in a home built in the 50's to achieve noise reduction?

Trademark Soundproofing Reply: Hi Norene, Yes Green Glue is commonly used over existing walls.

8) Kym: I had an addition put on the house over the master which has turned into a guest suite. I can actually hear guest snoring like they were practically next to me! Without having to completely dismantle either room, can I get any relief worth investing in ? (And by what method?)

Trademark Soundproofing Reply:

Hi Kym. Easiest would be to install carpet on the guest bedroom floor and use our premium carpet underlayment as the padding.