Green Glue FAQ

1. How can I Purchase Green Glue?

Trademark Soundproofing has a variety of Green Glue Damping Compound material to suit your needs. Our most popular is the 12- 29oz. Green Glue Tubes. Additionally we have 5 gallon buckets of Green Glue and Green Glue combo packs which are a combination of Green Glue & Acoustical caulk. You can place your order via our secure web site or over the phone with one of our friendly associates. 

As a preferred Green Glue dealer Trademark Soundproofing can provide significant discounts on large orders. We also sell Green Glue at wholesale pricing for qualifying distributors. Give us a call at 845-388-1200 for details.

2. Do you Ship Green Glue World Wide?

Yes we do! All orders to the 48 States can be placed through our website and it is the same flat rate to any state. For Orders to Alaska, Hawaii, Canada and throughout the World please call our office 845-388-1200 or email us for a shipping quote.

3. What is Green Glue and how does it work?

Sound travels as a wave through the air. It is an airborne vibration. The waves hit a wall or ceiling and the energy becomes structure-borne. Unless the wall or ceiling material is damped, the vibration will travel through the building framing and exit somewhere else as sound again.

Image showing how Glue dissipates sound waves

In a constrained layer damping system, sometimes referred to as CLD, a damping material is sandwiched between two other (usually stiff rigid) materials. For example, Green Glue sandwiched between two layers of drywall. Damping occurs when the viscoelastic center of the sandwich is sheared (see right).

When bent, shear forces pull and stretch on the damping material. Under these conditions, the unique polymeric construction of Green Glue very efficiently converts this mechanical energy to heat. The vibration energy is not isolated, it is dissipated and gone.

4. How is it applied?

By squeezing the Green Glue out of the tubes onto the surface you are applying it to. You can use a quart size caulk gun for the tubes and a bucket applicator for the buckets. It is very fast and easy to apply no special skills whatsoever are required, just caulk the Green Glue out onto the back of the drywall in any pattern you prefer using the recommended coverage. Full cases of Green Glue come with instructions in English and Spanish.

5. Should I use Tubes or the Bucket?

A five gallon Bucket of Green Glue will cover about the same amount as two cases (24 Tubes). If you include the cost of the bucket applicator that is a saving of $30. That being the case when you are applying 600 sf or less it is best to stick with the tubes.

On larger projects the savings start to add up and it would seem like a no-brainer to go with the buckets. However our own experience and the feedback from large construction site managers has taught us that saving a few extra dollars is not always the best route to take. The problem is that filling the bucket applicator gun (as wide as you will cut the nozzle) gets tiring and drywall crews want to finish hanging sheet after sheet of drywall. Eventually instead of using 2-3 loads of Green Glue per sheet they start applying only one. The tubes are simpler and neater (the bucket applicator needs the end wiped on the edge of the bucket to avoid dripping) you just cut off the nozzles of a few cases before you begin and you use 2 caulking guns. Additionally you can check and see exactly how many tubes were used.

In conclusion on a job larger than 600 sf that you are doing yourself or you have steady meticulous workers, you can save money and use the buckets. On very large projects where you have a crew hanging your drywall you may be better off using the tubes and knowing that the job was done right.

6. I added drywall and Green Glue onto my wall and I do not hear that much improvement.

You have to Wait 7 days before attempting to listen for improvement. When Green Glue is applied it is in a very liquidity form so the only improvement your wall/ceiling has is the added layer of drywall. Once the Green Glue starts drying and becoming elastic you begin to have the damping factor improvement. That starts at 7-8 days after application and lasts up to 45 days when you get the full benefit of the Green Glue.

I had two noisy neighbors on either side of me. Screaming baby on one side and college kids who played rap music all night on the other. As part of a larger remodeling project of my condo I had the contractor add a layer of drywall over the existing walls with Green Glue added in between. After 30 days had passed I really thought I had wasted my money however after about about 45 days I started to notice a difference and after 60 days this place was a virtual fortress. I honest to God I don't even know the neighbors are there any more. I never hear the rap music or the crying baby. Adding Green Glue was well worth the investment.

If after waiting you still do not see any substantial improvement than you may have to take a look at your building structure. E.g. one common cause is when 2 adjoining rooms share 1 attic space. Even after treating the wall in between the rooms the sound will jump the wall and come in through the ceiling. You would either have to build the wall all the way up to the attic ceiling insuring a proper acoustical seal, using acoustical caulk, at the top and bottom of the new wall and treating that wall with Green Glue. Another option is to treat the ceiling in the room so that the sound cannot jump the wall.

7. Can I use Green Glue with only one layer of drywall?

No. Green Glue needs to be a constrained layer, meaning that Green Glue is sandwiched between two rigid, dense layers of building material. There is no limit to how many drywall / Green Glue layers you can utilize, and performance will improve as the # of layers goes up. You can save valuable money by using slightly less Green Glue in each damping layer if your walls are to have more than 2 layers of drywall. For floors, you can use any common materials (cement board, OSB, plywood, etc.)

8.Will I gain by applying Green Glue to the face of the joists before I hang the drywall?

The gain is minimal being that Green Glue works best at points of resonance (that is why it performs better on walls spaced 24" apart than those spaced 16" apart) with the drywall firmly attached to the studs the Green Glues damping factor will not be as powerful. A better and cheaper alternative is to use Gasket Joist Tape. Besides for the damping properties the soundproofing tape will also add some sort of decoupling between the studs and drywall.

9. Do I use nails or screws in conjunction with Green Glue?

We recommend the use of screws in accordance with local building codes. Screws assist with the compression of the Green Glue layer into a thin film.

10. Should I use conventional adhesive along with Green Glue?

No. The presence of rigid, low-damping materials alongside Green Glue between layers is not desirable.

11. How thick is the Green Glue layer?

About 0.5 mm.

12. Can Green Glue be used in floors?

Absolutely, in fact when used in floors, Green Glue yields a double benefit - it helps with both impact (footstep) noise and airborne sound, and is very effective at both. Green Glue may be used between layers of sub floor, between sub floor and tile backer board, and between thin set mortar and the surfaces below. You may be able to use 2 layers of thinner sub floor if convenient.

13. Can I treat just the ceiling, or should all surfaces be dealt with?

If you have a situation where you want, for example, to stop sound from moving upstairs, the most logical path for the sound is through the floor/ceiling into the room above, this is called the direct path. However, sound can make its way upstairs through the walls (or even floor) as well in the form of mechanical vibration. Sound in your room vibrates the walls, this vibration makes its way up where it creates sound by vibrating the surfaces of the upstairs room. Sound making its way through these indirect paths is called flanking noise.

An analogy that is sometimes used when discussing sound isolation is that of an aquarium. If your aquarium has a hole in any of the 5 sides, then the water can spill into the floor, regardless of how tight the other 4 are. The same applies to sound.

For best results, you should consider treating all the surfaces of your room. You may also have to pay attention to other sound paths, such as noise going in and out of doors, and noise making its way through duct work. Read more about how sound can travel along non-linear paths.

14. Can GG make a high performance wall without decoupling methods such as resilient channel?

Yes, without a doubt. In fact, Green Glue has performance advantages in many applications relative to some decoupling schemes. Chird party lab test showing Green Glue achieving an STC of 52 when applied to only one side of the wall! 

15. Can Green Glue be used in conjunction with decoupling techniques?

Yes, and better performance can be had. For walls the preferred decoupling methods are 1)double studs 2)staggered studs 3)Whisper Clips 4)resilient channel. For applications where low frequency isolation is important, resilient channel is not recommended.

16. Will Green Glue perform even better in between drywall and soundboard?

No. Soundboard is far lighter than drywall and isn't preferable in any ceiling or wall assembly.

17. How does Green Glue compare to other techniques?

We have same-lab, 3rd party data answering this question directly. See our Green Glue Test Data and Comparison Page or Contact us for any copies and info.

18. Is Green Glue toxic?

No. Green Glue is water based, non-toxic, non-carcinogenic, and very low in VOC (<5grams per liter / compliant in all 50 states and worldwide). As with all products, paints, glues, and so forth, you should use proper precautions and read the MSDS before using Green Glue. Green Glue has a mild odor, typical of latex products. This odor is not dangerous and will dissipate completely given time.

19. Is Green Glue a fire hazard?

No. Green Glue has been fire tested, and can be utilized in fire-rated walls without affecting the rating of the wall. Click here for a copy of the Green Glue UL report

20. How much does Green Glue cost?

About 75 cents per square foot, (.65 cents with the buckets and .85 cents using tubes) making a layer of Green Glue the most economical sound isolation product around, as well as one of the best. 

21. How much do I need?

Recommended application is 2 tubes of Green Glue per 4' x 8' area - 2 tubes per standard sheet of drywall. If you are not on a budget, utilizing 3 tubes per sheet will improve performance. Each case of Green covers about 192 square feet when used at 2 tubes coverage, or 128 square feet if used at the 3 tubes coverage rate. For simple calculation take your square footage and divide by 16. Do not use more than 3 tubes per 4' x 8' sheet as performance will actually decline above 3 tubes per sheet.

22. I need to soundproof on a budget, how can I reduce the cost of a Green Glue room?

Wonderfully, Green Glue performs at an only slightly lower level if you use it at 1.5 or even 1 tube per sheet instead of the recommended 2. about 70% of the raw damping performance is retained when using 1 tube per sheet. In fact, Green Glue can improve performance if used at even less than 1 tube per sheet.

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Customers Questions and Answers

1) keith: how do i clean up green glue from tile floor?

Trademark Soundproofing Reply: Try using some Goo Gone or isopropyl alcohol (rubbing alcohol).

2) willem: hi, what is the shelf life of GG, I want to buy some in the US before I move back to europe and build a hometheatre there but that will take a while, thnx

Trademark Soundproofing Reply: Hi Willem, Officially one year although it can probably be longer if kept at room temperature. The year starts from date of manufacture. The GG we sell at Trademark Soundproofing is usually factory fresh within 2 weeks of production. Thanks

3) Jason C: I am planning on attaching a drywall sheet with the green glue to the roof of a basement room. I would be screwing it to an existing layer of drywall. Do the screws attaching one layer of drywall to the other transmit noise or lower the value of the green glue?

Trademark Soundproofing Reply:

Hi Jason. They do not. Green Glue works by damping the vibration of the actual drywall panel. Contrary to the myth, screws do not transfer sound. Rather when you screw the panel to the joist it is coupled with the other side. This can be remedied by using our clip and channel system. See our line of resilient sound clips here. Thank You.

4) Frank W: I am planning to soundproof a window in a voice over studio. I will be using a 5/8" drywall barrier, screwed to a 3/4" MDF panel and a final 1/2" drywall sheet. Can I use GG on both sides of the 3/4" mdf panel?

Trademark Soundproofing Reply: Hi Frank. Yes you can as long as you will have drywall covering the MDF on both sides as well.

5) Robin: I am putting down engineered hardwood that is nailed down. Would green glue perform reasonably well if i placed it between a layer of 3/8" osb and then my 9/16" engineered flooring on top (nailed to the osb). The osb will be on a 3/8" layer of rubber mat sitting on a wooden subfloor.

Trademark Soundproofing Reply: Hi Robin. It would work very well provided that the bottom of your engineered flooring is flat and does not have any grooves.

6) Mike: I have a 5/8" OSB subfloor and plan to put down another layer of 5/8" OSB with Green glue in between. Should I nail the second layer through the first to the joists, or should I attach to the first layer between joists? Also would screws be better than nails? Thanks

Trademark Soundproofing Reply: Hi Mike, Back to the studs is fine, Screws are better than nails.

7) lynn : Is it reasonable to use green glue to create a plexiglass window plug? For example, green glue used as an adhesive between two pieces of plexiglass? I'm looking for an inexpensive way to soundproof a window without loosing the natural window light.

Trademark Soundproofing Reply:

Hi Lynn, Unless you are using half inch panes the glass will be too thin for the Green Glue to have proper effectiveness. I would suggest that you look at our Window Panel Barrier which is available in a clear see through vinyl. Thank you.

8) Abraham: If I use green glue between 2 layers of 5/8's drywall, can I use the green glue again and add another piece of 5/8's? Would this double the effectiveness of the green glue? Or is it overkill?

Trademark Soundproofing Reply: Hi Abraham. It is not overkill it is also not double the effectiveness it is about half the effectiveness with the 3rd layer.

9) Jisel: I have a wall that is only covered with 1/4" mdf. If I use green glue with a 5/8" drywall over the mdf will it work? Or would I need to add a second sheet of drywall as well. ?

Trademark Soundproofing Reply: Hi Jisel, It would work as long as the MDF is stiff and rigid (no waves). You'll get slightly better results if you apply a half inch drywall layer first.

10) Kerie H.: I need to dampen sound between the wall of my bedroom with the bedroom behind it (part of a separate mother-in-law apartment added to the house, does not share attic space). I heard about using masonite instead of drywall for walls, would green glue work with that as second layer over existing wall? Ideally, I would like to do a plank look on the wall and saw this tutorial for using masonite for planking. Could green glue method work, applied to individual planks?

Trademark Soundproofing Reply: Hi Kerie, Green glue must be applied between two rigid membranes. It can and is used between two layers of masonite provided that each layer is at least half inch thick. You would get better results if you used 2 layers of drywall and then covered it with planks.

11) Johnny: Dear TM Soundproofing, I was planning to add some drywall layer + GreenGlue over existing drywall, but I just realized part of my wall is actually made of metal. I did not realize before because it is painted the same as the rest of the walls. I think the metal forms some kind of large air exhaust ducting that goes vertically through all the floors of the building. So I cannot puncture/use screws on the metal wall. But I can add something over it. The question is, can I soundproof it (add over it) with a layer of GreenGlue+drywall? Thank you, Johhny

Trademark Soundproofing Reply: Hi Johnny, How will you attach the drywall if you cannot puncture the wall.? Green Glue can not be used as an adhesive. If you can hang the drywall on that wall, then I would suggest that you hang one layer of drywall first and then a 2nd layer with GG in between the 2 layers. GG between a thin metal sheet and drywall will not be as effective as between two layers of similar density drywall.

12) Paul: I need to reduce the echo within a room, would an extra layer of drywall with greenglue installed, aid in reducing reflected sound? If so, should the overlay be thinner (1/4-3/8") or thicker drywall (1/2"-5/8")?

Trademark Soundproofing Reply:

Hi Paul, Yes green glue would somewhat and you should use 1/2" drywall. However for proper acoustics IN a room you need acoustical panels on your hard surfaces.

13) George R: Existing: Two adjoining bedrooms with 1/2 drywall on studs. Some of the stud bays have unfaced fiberglass batts. Is it better to strip to studs and start over, or will green glue and a second layer of drywall be just as effective? The wall is painted with light texture.

Trademark Soundproofing Reply: Hi George, For a 2nd layer with Green Glue you are better off just going over the existing wall, no problem with performance there. If you want to add clips and channels then you should strip it down to the studs. Keep in mind if you have an open attic above the wall you will need to treat the ceiling as well.

14) russ: i have a ceiling thats been stipped & painted . can i spread green glue on a sheet of gyprock with a trowel & put it up against the ceiling ?

Trademark Soundproofing Reply:

Hi Russ. Yes you can. Only use a trowel if you are using the buckets of green glue. If you are using the tubes of green glue just caulk out 2 tubes for every 4 x 8 sheet.

15) Jon: Dear Sir/Madam, I have a Reno project with two potential applications for green glue on the 2nd floor: between a 12mm rubber mat (2.5 lbs/sqft) and the subfloor (5/8 OSB), before applying carpet; and, between a 10 mm rubber mat (2.1 lbs/sqft) and the same subfloor before applying a floating engineered wood floor. In either instance, will the green glue provide and meaningful improvement in soundproofing when applied between the rubbermat and subfloor? Thank you.

Trademark Soundproofing Reply: Hi Jon. Excellent question and I cannot give you a scientific answer as Green Glue has not been lab tested with any rubber mats. proper application of Green Glue should be between two similar rigid membranes however we have received some very positive feedback from contractors who have used the Green Glue in the way you describe and they were very please with the results. FYI we now carry top of the line 10 and 12 mm rubber underlayment as well if you would like a quote on that please email Thank you.

16) Chris M: I will have 2 powerful 12" subwoofers with a 7.2 surround sound so I will opt to use 2.5 tubes per 8 foot sheet. I'm paranoid if I accidentally go over 3 tubes per 8 feet I will do more harm than good. I will be using whisper clips, standard 7/8 hat channel, 5/8 sheetrock, green glue and one more layer of 5/8 sheetrock. So if two tubes is 0.5 mm thick I'm sure 2.5 tubes isn't much thicker. Do I need to account for this extra thickness when adjusting light fixtures, electrical outlets and window/door jams.....and if so how much depth should I add. One customer on a Forum suggested adding 1/8 of an inch for the green glue. What are your thoughts? Thank you, Chris

Trademark Soundproofing Reply: Hi Chris, No reason to get paranoid it won't do any harm it also won't to any extra good (once you go over 3 tubes). The GG takes up no add'l thickness that you need to account for other than the 2nd layer of drywall.

17) Fritz: We are building a lower level master suite. The walls will be covered in Вѕ" thick x 8" wide tongue in groove Douglas fir. The ceiling surfaces will be 5/8ths-inch gypsum drywall board. We plan to use Roxul SafenSound in the cavities between the floor joists, as well as the wall cavities in the partition wall/hallway walls. Can we use SilveRboard under the wall planking, as well as the ceiling drywall for maximum soundproofing effect?

Trademark Soundproofing Reply:

Hi Fritz. For sound control I would use half inch drywall and Green Glue Damping Compound on the back of the 2nd layer that you are putting up on ceiling and on back of Douglas fir.

18) jim: I have plaster walls with no insulation can I apply green glue, with dry wall, and do I need mlv for best results

Trademark Soundproofing Reply: It will help somewhat. Ideal is to have insulation behind there first.

19) Perry: Has green glue been used in any sound dampening projects for automobiles? If so do you have any information concerning same that you can share.

Trademark Soundproofing Reply:

Hi Perry. We have no testing on that and the extreme temperatures that automobiles are subject too are not the ideal for the application of Green Glue. We have received very positive feedback from customers who have used our Mass Loaded Vinyl in their automobiles.

20) Gethyn: Hi Does gravity affect the performance of green glue over time at all? Does it in any way sink or 'flow' towards the floor in a vertical installation, or is it simply not that kind of stuff? I've seen a lot of talk of it 'never fully setting' but perhaps that's not quite an accurate description. Many thanks Gethyn

Trademark Soundproofing Reply: Hi Gethyn, It does not. Green Glue is extremely sticky. We have samples (in an upright position) at our office that are over 10 years old with no movement of the material at all.

21) Terry: Will using the Green Glue between my subfloor and underlayment in the kitchen and bathroom help much if I am using 1/4" underlayment?

Trademark Soundproofing Reply: Hi Terry, What type of underlayment are you using? If it is a solid membrane i.e. wood it would help although it would be much better if you can go to half inch.

22) GaryB: New church basement. Sanctuary floor joists above are wood 12" deep. Can I screw 1st layer of rock to joists, then 2nd layer with gg. or do I need whisper clips between joists and first layer of rock. Room is 5900 sq. ft. Don't want noise up in the sanctuary. Gary

Trademark Soundproofing Reply:

Hi Gary. First install fiberglass insulation. Depending on the level of soundproofing you wish to achieve you can then go with the best, which would be whisper clips, channels, drywall, green glue, drywall. Or you can go with Good soundproofing which would be 2 layers of drywall and Green Glue attached directly to the studs.

23) Scott S: We are using Green Glue between two layers of sub-floor - the project is enclosed but not heated yet. I see the best temp for installation is 40-90 degrees. If you install in that temperature range and later the temperature falls below 40 or below freezing will it damage the product?

Trademark Soundproofing Reply: Hi Scott, Once installed there are no issues with temperature falling below freezing. Thanks.

24) Bob: Would 1/2" particle board over 3/4" t&g edge gold (osb) be similar enough density to work well on floor under carpet?

Trademark Soundproofing Reply: Hi Bob, Yes the 2 would work well.

25) Nick: I have one side of my bathroom walls open, so I see the back of the drywall in adjacent rooms. I'm thinking about doubling the drywall by inserting 22.5" drywall panels between studs and using GG in between. Is the GG sufficient to hold the panels attached to the existing drywall or some kind of additional support is needed? Thanks a lot.

Trademark Soundproofing Reply: No. Green Glue is not a proper adhesive and should not be used as such. You should screw the drywalls together.

26) Terry: Soundproofing over the current 1/2 drywall already installed. Which would be better? #1 Green Glue w/ 5/8" drywall (1 new layer) OR #2 Green Glue w/ 1/2" drywall and again Green Glue w/ 1/2" drywall (2 new layers).

Trademark Soundproofing Reply: 2 new layers.

27) Dave: Soundproofing my basement. Floor above is laminate/tile. We were going to do insulation between joists, resilliant channel and then two layers of drywall. This is pretty standard n my area. How much of a different will it make if I apply 2 tubes of GG per sheet of drywall? What % of a further reduction in sound is this likely to give? - Homeowner in Vancouver, BC

Trademark Soundproofing Reply:

Hi Dave. It will significantly improve your ceiling by about 9 STC points for airborne sound less for footfall sound. If footfall sound is your main concern you should consider using Resilient Sound Clips, like the Whisper Clips.

28) Nick: Hello again, I would like to ask you one more question about the Green Glue. Is it acceptable to use it between plywood and a product called Kerdi Board (

Trademark Soundproofing Reply: Hi Nick, You can use it however it would not perform that well vs if you use it between 2 layers of plywood and then add Kerdi Board.

29) Brent: I would like to soundproof my bedroom from a busy street outside. Would it make sense to apply MLV over the current drywall, green glue on top of that and then new 5/8" drywall? Is that the correct order of things? The bedroom wall face the exterior street.

Trademark Soundproofing Reply: Hi Brent, Green Glue will not perform that well when applied between MLV and drywall. Rather put the GG between 2 layers of drywall. If you want to utilize both, then the correct order would be, MLV, Drywall, GG, Drywall.

30) harold: Building a box over a noisy pool pump. Any suggestions on construction. Seems most folks are involved with drywall. I could have two inner layers of drywall separated by green glue. My main concern is the limited size of the box. Thanks.

Trademark Soundproofing Reply:

Green glue is not really meant to be used in an exterior applications. take a look at our sound control blankets exterior grade or try building a box using mass loaded vinyl.

31) Nigel: I have a hardwood floor on 16" spaced joists. I will put green glue, 1/2 drywall, sealant green glue 1/2 inch drywall and again sealant. Will the glue hold it up until dry or do I have to use screws as well? If so how many screws and where best to position?

Trademark Soundproofing Reply: Green Glue is not an adhesive you always have to use screws to keep the 2nd layer in place as per the building code in your area. Also on a floor you probably want to use plywood or OSB rather than drywall.

32) Jasmine L: yes green glue work between layers of cork and rubber?

Trademark Soundproofing Reply: It works slightly. To maximize the Green Glue performance you want to use solid rigid membranes.

33) gav: Hello, how are you? I would like to make an acoustic/hush box for a centrifugal fan in a VOC sensitive environment and was wondering if Green Glue products would work on the following ... Glue two 1/4 inch Masonite Hardboards together with Green Glue Noiseproofing Compound and cut the sheet into the correct dimensions for the box - length approx 2 foot and Height and Width approx 1 foot. I would then screw the pieces together to make the box and use Green Glue sealant on the joins/edges. 6 inch holes in the front and back of the box would be cut to allow inlet and outlet airflow through acoustic ducting - Green Glue Sealant would be used to seal the acoustic ducting to the masonite edging the hole. Just wondering if the Green Glue products and masonite would be okay for this box. Thanks

Trademark Soundproofing Reply: They would be OK. 1/2 inch boards would be better.

34) Jeff W: We have a somewhat noisy neighbors with a decent sub woofer, but our walls also appear to be "paper thin". I have the budget/know how to only apply to the interior wall. Code in my area as insulation of R-16. On an exterior wall of otherwise unknown construction, would Green Glue work well if I double layered the interior portion only of the exterior wall? Basically meaning we did not remove any of the external siding and added layers there. There are no windows along this wall.

Trademark Soundproofing Reply: Yes it would work, however you may still be getting some of the sound through the ceiling (especially if there is an attic above the room) so you may want to consider treating that as well.

35) Dennis K: Applicability for fastening mirrors to drywall? Hi, I have a mirrored wall in my condo and plan to replace the mirrors on that wall. The installation team used their own glue/cement and after 12 years the product they used easily detached from the back of the mirrors, and in some cases the glue/cement was shown to not perform at all when the existing mirrors were removed. So, how does GG compare as an adhesive and in particular, is GG something I can use to fasten my new mirrors to newly installed drywall? Thanks, Dennis

Trademark Soundproofing Reply: Hi Dennis. Green Glue is not an adhesive and should not be used that way.

36) Imran L: I am renovating a house and in certain sections the subfloor is being replaced. Would it be beneficial if I used green glue between the joists and the new plywood subfloor? So the joists would be covered in green glue and then the subfloor would be placed on top and screwed into the joists.

Trademark Soundproofing Reply:

The benefit would be minimal and not cost effective. You are much better off using the Joist Gasket Tape.

37) T Van Cantfort: We are searching for a soundproofing solution for our bedroom in our condo. We can hear the man snoring in the unit above us. The condos were constructed to be one unit, then later they took out the stairs and made them separate. The ceiling has a heat vent in it, is "stippled" and painted. Would using Green Glue and drywall be a solution for us? ps the heat systems are separate.

Trademark Soundproofing Reply: If you have insulation in the ceiling than the added layer of drywall with GG will definitely help cut the sound down. The heat vent is an obvious short circuit in the sound control system as is the possibility that the sound could be flanking down the walls (via pipes, ducts etc) too.

38) Todd Riedel: I have an existing room with 1/2" drywall that has been textured and painted. Can I install a new layer of drywall over the existing layer with GG in between or do I have to rip out the existing drywall and texture? I want to make sure the existing texture won't affect the GG or new drywall.

Trademark Soundproofing Reply: As long as the existing texture grooves are less than 1/8 of an inch you are fine. If not you can sand it down.

39) Julie: Hi, I am interested in sound reduction for a concrete slab ceiling. Ive read about decoupling and adding insulation plus 2 layers of drywall with green glue in between. How much benefit would I receive from adding 2 layers of drywall with green glue in the middle? I do not believe the sound is traveling down th plaster walls, but due to hard, heavy footsteps on glued down parquet floors over the concrete slab. Thank You in advance for any advise/help you can offer.

Trademark Soundproofing Reply:

If you will be decoupling first with the Clips and Channels than the Green Glue will help out tremendously. However if you are doing Green Glue alone than it won't be enough for footstep sounds.

40) IITT: 1. Hi, the drywall in my house has been painted, can I apply a second layer of drywall on top of the first one using green glue compound? Will the compound stick to a painted surface? 2. Can drywall tape or fire tape be applied over green glue sealant once it has dried in 48 hours?

Trademark Soundproofing Reply: the answer to both questions is "Yes".

41) Denise B: Hi, I want to dampen sound between my house and the basement space. The joists are open and I'm going to install 5/8 drywall to the joists using RC channels. I'm also going to put insulation in the joist bays. I'm thinking of attaching one layer of 5/8 drywall in the joists bay to my subfloor using green glue and screws. Will green glue work sandwiched between drywall and the wooden subfloor? I read that it had to be sandwiched between building materials. Thank you, denise

Trademark Soundproofing Reply:

The Green Glue can be used between drywall and plywood with no issues to performance.

42) Lorinda C: I would like to soundproof my walls and ceilings.. Can this glue be used sandwiched in between a layer of bricks and a drywall? As I am trying to ensure that not too much space is taken from the room itself... To achieve better outcome, how many walls in the room should be soundproofed with this technique??

Trademark Soundproofing Reply: That is not recommended. Rather use 2 layers of drywall on the brick with the green glue between the 2 layers. Ideally all six sides of a room should be soundproofed.

43) Bob J: Can I apply joint compound and tape over green glue sealant and sand to finnish my wall ?

Trademark Soundproofing Reply: Yes that can and is done all the time without any negative effects.

44) Bob J: Will putting joint compound and tape over green glue sealant effect my finished drywall

Trademark Soundproofing Reply: No it will not effect it.

45) Greg: Hello, I live on the second floor of a house (apartment). I'm building a vocal/guitar booth and the weight of the entire project is a concern because of the limitations of the floor. I am avoiding drywall because of the weight. I am not looking for 100% soundproofing, but was wondering if it's worth it to combine these materials in the following sequence: Plywood-Green Glue-Mass Loaded Vinyl? Thank you for any info.

Trademark Soundproofing Reply: Green Glue will not work well between plywood and MLV. It needs either a 2nd layer of plywood or drywall.

46) David: I currently have 5/8 OSB subfloor installed and am looking to install 3/4 inch hardwood floor on top. Should I install another layer of 5/8 OSB sheet with green glue between the two boards and then install hardwood floor on top or should I just put the green glue under the hardwood planks on the current 5/8 subfloor? Adding another layer of OSB board can be costly as I'm trying to do soundproofing for about 3000 sq ft. If it it is worth adding another 5/8 board, is it better to glue down the hardwood floor to nail it down?

Trademark Soundproofing Reply: Hi David. That would be the preferred way to do it. Putting the Green Glue directly beneath the hardwood planks is not recommended. As the planks have grooves at the bottom. You can nail the hardwood down to the top layer of OSB. By the way you can go with 1/2" OSB for the 2nd layer for some cost savings.

47) Kepper: I have a poorly heated bedroom next to a bathroom and want to decrease noise from bathroom. I have been advised not to add insulation to the interior wall as it will decrease ambient heat reaching that room. There is 1/2" drywall. I plan to add another 1/2" drywall with Green Glue sandwiched between. Would adding 5/8" instead of 1/2" drywall improve sound damping significantly? How do you weigh in on insulation vs. no insulation? Thank you.

Trademark Soundproofing Reply: Very small difference between 5/8 and 1/2. Insulation on the other hand will make a very big difference.

48) Ray : If I apply Green Glue on 5/8 sheet rock ceiling that attached to the floor joist above that made of with another 5/8 what would my STC be ; I take it back its drop about a foot an half and attached to 2 by 4

Trademark Soundproofing Reply:

Adding a layer of drywall with Green Glue Damping Compound will usually add about 9 STC points to the existing STC structure (provided there is insulation in the cavity).

49) Steven: Have 2nd floor apt unit with noisy upstairs neighbors . Hear walking all the time. Have plastered ceilings. Would adding 5/8 drywall and 2 tubes of caulk per 8? sheet make big difference???

Trademark Soundproofing Reply: Not enough for footstep noise to be worth your effort.

50) Peter J F: I am looking to put green glue in between 2 sheets of 5/8 drywall only on one side of a wall between a bedroom and a family room. Which side would it be more beneficial to apply to keep noise out of the bedroom? Family room or bedroom side?

Trademark Soundproofing Reply: Whichever side is the "source" of the noise that you are trying to control.

51) Joe: I want to reduce the sound between to bathrooms. I am planning to install 3/4 inch wood shiplap over the existing drywall. Will the green glue be effective?

Trademark Soundproofing Reply: Yes the Green Glue will be effective in that case (some effectiveness will be lost do to the many joints that are thinner than the 3/4). Try to be careful that it does not squeeze out at the joints

52) Kay: I would like to turn one of the spare bedrooms upstairs into a home gym. I plan to rip up the carpet and put down T&G wood flooring but am concerned about noise transfer, since footsteps making a vibrating sound over the living room. Would green glue work if I just put it on top of the plywood subfloor before laying my wood floors?

Trademark Soundproofing Reply: Somewhat. Better if you put Green Glue another layer of plywood and then your hardwood. Being that it will be a gym you will probably still hear the impact sound however it will be damped.

53) Stan: In a renovation, there is a load-bearing wall down the center of the basement, the wall surface of which has been removed. Parallel to that stud wall, about 1.5" away is a non-bearing stud-wall that had 5/32" wood paneling, originally in 4'x8' sheets. The paneling, which we like, has been removed and preserved. I have in mind attaching one layer of 5/8" OSB (for strength to mount TV anywhere on the wall) together with a 5/8" layer of sheetrock with GG between to the room-side of the non-bearing stud wall. Then finish that wall by re-applying the wood paneling. First question: should we attach the OSB or sheetrock adjacent to the studs. On the parallel bearing wall the outer surface, facing into the adjacent room, will be a 6' 2" tall 1/4" thick mirror (3 lbs/sq ft) for the entire length of the room. Second question: What is an adequate material to attach to the stud wall and GG-dampen with the mirror? The mirror will be supported by J-channel at the bottom and U-channel at the top, screwed to the wall. The wall is 11.5" taller than the mirror. Q3: Would you apply some additional barrier material above and/or below the mirror? What? How would you mate it, acoustically, to the mirror? Q4: How would you suggest sealing the gap around the mirror between the GG-mated surfaces? GG acoustic caulk?

Trademark Soundproofing Reply: Hi Stan. I am not clear on your first question. What do you mean if you should attache it adjacent to the studs? As to the question about the mirror. The only way to achieve a proper damped wall would be to first apply 2 layers of drywall (or OSB) with the Green glue in between and then simply hang the mirror on that wall (you can fasten it all the way back to the studs).

54) Jose: Can I use regular coarse threat screw on my new drywall that is going to be sandwich with green glue?

Trademark Soundproofing Reply: Yes.

55) Roman: We are soundproofing between two apartments, one above the other, in a duplex with masonry walls probably built in 40s-60s. It has 8-inch wooden joists with subfloor made out of 5/8-inch wooden boards/planks nailed to the joists at 45 degree angle (which we will re-screw to joists to reduce squeaking). What is the best way to soundproof from noise from upstairs (footsteps and other residential noise): 1. Add 3/4 inch plywood with green glue between the wooden board subfloor and the plywood. 2. Use construction glue to glue 1/2 plywood to wooden boards first (to eliminate all squeaks and create monolithic rigid surface) and then use green glue and another layer of 1/2 plywood. 3. Use green glue between the wooden boards and 1/2 plywood (and possibly risk some remaining squeaks?) and then again green glue between 1st and second layer of 1/2 plywood? 4. Is it a good idea to also put two layers of 3/4 drywall with green glue into the joist bays, or this is an expensive overkill? We will also use whisper clips, hat channel and two layers of 3/4 drywall with green glue in between to reduce sound traveling from downstairs.

Trademark Soundproofing Reply: Hi Roman. Number 2 is the correct way (you can screw the first layer down through the wooden planks into the joists too). Number 4 is over kill. Be sure to put some insulation between the joists (like R-19 fiberglass). Great ceiling floor assembly. You should hear a dramatic difference.

56) LaMarr: The studs in my unfinished home theater vary from 12 to 16 inches apart. Will Green Glue work in this situation or should I seek another route for sound proofing. My daughters bedroom is on the other side of the back theater wall and the studs are 15 inches apart, this wall will be my main concern.

Trademark Soundproofing Reply: Green Glue will work regardless of the spacing of the studs.

57) Rick: How much difference would there be between the following two applications: GG between a 5/8" base layer of drywall and a 1/4" top layer compared to GG between two 1/2" layers? I'm doing a double layer of 5/8" on exterior walls and ceiling but can't accomodate that thickness on the interior walls. My main concern is exterior noise and the 5/8"-1/4" would be easier to manage from a logistics perspective, assuming it would add any benefit. Thanks.

Trademark Soundproofing Reply: 1/4" layer is not recommended for use with Green Glue as it is too wavy. Better off if you use 2 layers of 1/2 inch.

58) sean: Hi, I am building out a woodshop in a 20x40 Concrete block structure on a slab. It is very close to an Assisted Living house and I need to reduce the sound transmission from my tools as well as insulate for heating and cooling. My plan is to attach 1" RigidFoam to the interior of the block wall (possibly with GG?) then have a 1" air gap, then 2x4 interior framed wall,filling the stud bays w/ R-15 Fiberglass batts, then 1/2 sheetrock. If its still too loud outside will skin the whole interior with GG and another layer of 1/2 sheetrock. Would the GG be appropriate to use between the Rigid foam and the Block wall?

Trademark Soundproofing Reply: Not really. The rigid foam is too lite of a material for the Green Glue to perform properly on.

59) daemian: Will green glue work between plaster and sheet rock?

Trademark Soundproofing Reply: Yes

60) UA: The recommended application is 2 tubes of Green Glue per 4' x 8' area - 2 tubes per standard sheet of drywall (0.5 mm thickness). Does this mean that sandwiched between two 4' x 8' sheets of drywall one should use 2 tubes (.5 mm thickness) between the sheets or 4 tubes (.10 mm thickness) between the sheets?

Trademark Soundproofing Reply: 2 tubes.

61) Kevin: We live in top floor and can hear everything from neighbors below. We are going to install engineered hardwood and premium underlayment over existing tile floors. Is it possible to put green glue directly on tile floor then cover with one piece of plywood or cement board before placing underlayment?

Trademark Soundproofing Reply: The Green Glue will not perform properly between the tile and board. If you wanted to utilize it you would need to put down 2 boards with the green glue in between.

62) Don: Can u use a brush to apply green glue out of the bucket instead of dispenser

Trademark Soundproofing Reply: It will be difficult as the material is very gooey, a roller may work.

63) Randy: New Construction, option to use (2) pieces of 5/8" drywall w GG or 1/2" + 5/8" w GG. How much better is the performance using (2) 5/8" pieces of drywall with GreenGlue in between? I was thinking the 1/2" would save a little in cost and wall depth but also may help cut out different frequencies. Does a certain brand or type of drywall have any effect? ie some are marketed as UltraLight.

Trademark Soundproofing Reply: Very little difference so if cost and depth are important to you go with the 5/8 and 1/2 inch.

64) Stephanie T: Can I use green glue on the bottom of a 1/4 cork underlayment? I'm first using green glue between subfloor and cement board, then planning on a cork underlayment and thought maybe an additional layer of green glue? Thanks!

Trademark Soundproofing Reply: Hi Stephanie. You can and it will help but only a little due to the type and thickness of the cork material so it may not be worth the money being spent there.

65) Wayne : I am soundproofing a sound studio for a music producer. It a a 10'x10' room 8' high. We insulated all stud cavities then screwed 5/8" drywall to the ceiling and walls. All seams in the entire room room were sealed with sound sealant. We then installed a second layer of 5/8" drywall over the first. We applied 2 tubes of GG to each sheet and screwed directly into studs. My question and concern is in reading questions and answers GG is not to be used as a adhesive, so is it going to be an issue if screws on second layer of sheetrock are screwed directly into the wood studs??? Not tape and spackling the room until I know answer to this question.

Trademark Soundproofing Reply: Hi Wayne. It won't be an issue as Green Glue is used as a damping compound not as a decoupling technique.

66) Steve: I have 2 questions, first I’m trying to treat my band room for sound. I had to keep the existing drywall (1/2”) and I’ve used whisper clips and hat channel with 2 sheets of 5/8s drywall with green glue sandwiched in between them for the walls and two sheets of 5/8s with green glue but no hat channel for the ceiling. Crossing my fingers that it will make a dent in the sound isolation. My first question is would it benefit me to put a layer of mass loaded vinyl up on the ceiling followed by green glue and a 3rd layer of 5/8s or would that do more harm than good? And my 2nd question is can you please give me any information on what type of electric boxes will work with my situation? Thank you!

Trademark Soundproofing Reply:

It would not do any harm however it will be sort of a waste on the Green Glue as it will not function properly when sandwiched between the MLV and drywall. It needs to be sandwiched between 2 rigid layers. Standard junction will work well just wrap them with acoustical putty pads

67) Heather Ault: I have a second-story attic bedroom with wood grooved walls and I would like to sound proof the wall facing the street. Can I install Green Glue, then drywall? Or drywall, Green Glue, then drywall? Or, is MLV and drywall better for this type of grooved wall?

Trademark Soundproofing Reply:

If there are not that many grooves you can use Green Glue and drywall. Otherwise use drywall Green Glue and Drywall (or MDF)

68) jack: Hi, I'm soundproofing an apartment ceiling, especially foot falls. I installed: Roxul bat insulation (3 layers), clips, channel, 1/2" QuietRock, GG (about 3 tubes per sheet), and 5/8" sheetrock. Considering adding a third layer of GG and sheetrock. 1. Does it matter if the third layer is 1/2" or 5/8"? and 2. Is it worth the effort? thanks! jack

Trademark Soundproofing Reply: At this point 1/2 inch is fine. Every layer adds however with diminishing returns. You should be able to get an idea of performance at this point. If it is satisfactory but you still want some more than it may be worth the effort.

69) Bryan: Hi, I have an outbuilding that we're going to turn into a band room. The structure is clad entirely in 1/2" plywood. I was hoping to seal with acoustic caulk, frame out 16" (or 24") on center studs, insulate, then apply 2 layers of drywall green glued together. Does this seem like enough treatment such that the neighbors won't be annoyed by a drum kit and guitars being played inside the structure, assuming we have a soundproof door installed as well? Would an initial layer of drywall GGed to the plywood before frame-out make a huge difference if not? Thanks!

Trademark Soundproofing Reply: Hi Bryan. It would be very good if you treating and sealing all walls and ceiling. Better if you were able to decouple the wall as well (frame it a little away from the outer wall). Adding an additional layer to the outer wall will enhance the soundproofing as well and I would recommend it in a music room like yours.

70) Simon: Currently I have 1/2 inch drywall on my basement ceiling that is not insulated on the floor joist above. If I use 3 tubes of GG for each sheet of 1/2 inch drywall installed to the existing layer, how much noise reduction would I have for footstep?

Trademark Soundproofing Reply: Hi Simon. Would not be worth it if the main issue is foot fall noise as there is no insulation there.

71) Kate M: Hi I would like to use green glue to help soundproof a wooden nap pod. The walls and roof of the pod are made out of two wooden panels. Can I use green glue in between these plywood panels? Will leave a gap between the panels? Thanks

Trademark Soundproofing Reply: Yes you can. The Green Glue will not leave any gap.

72) james : Hi, I am wanting to soundproof between floors in a 2 story house. (main floor / basement ) The framing is 4x12 timbers 48" centre with 2x6 tongue and groove planks for subfloor. I want to put a half inch layer of plywood overtop of the planks with the green glue in between . There are a few voids where the planks join up, is that going to be problem with the green glue or will it fill the voids between the planks? or should I full the voids with a concrete first and then green glue?

Trademark Soundproofing Reply: You should fill the voids first with caulk or similar.

73) Heather : Hi there, I am planning on adding a layer of shiplap over an existing wall but want to sound proof it. Can GG be added behind the shiplap? Or would it not be effective? I can't add another layer of sheetrock-it would just take up too much space in this small room. Thank you!

Trademark Soundproofing Reply:

If the back of your shiplap will be a continuous smooth layer than it will work well. Another option is the 1/8 inch thick of 1 pound mass loaded vinyl.

74) Dan: Is there a benefit to using GG between 1/4" paneling and 5/8" drywall (soundproof drywall) Thanks

Trademark Soundproofing Reply: Yes there is.