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Green Glue Compound is a sticky latex based material applied between rigid materials as a damping compound, not an adhesive. Green Glue Compound is most often used between layers of drywall, plywood, or HardiBacker.
How does Green Glue Compound work?
In a constrained layer damping system, sometimes referred to as CLD, a damping material is sandwiched between two other materials (usually stiff/center of the “sandwich” is sheared rigid). For example, Green Glue Compound sandwiched between two layers of drywall. Damping occurs when the viscoelastic center of the “sandwich” is sheared (see image above). When bent, shear forces pull and stretch on the damping material. Under these conditions, the unique polymeric construction of Green Glue Compound very efficiently converts this mechanical energy to heat. The vibration energy is not isolated, it’s dissipated and gone.
How is it applied?
Apply Green Glue Compound from tubes using a standard quart sized caulking gun.
Apply Green Glue Compound from five gallon pails using our quart size Green Glue Dispensing Gun.
Do I use nails or screws in conjunction with Green Glue Compound?
Yes. Green Glue Compound is not an adhesive, only a damping compound. Follow standard screw patterns of one screw roughly every eight inches. Screws assist with the compression of the Green Glue layer into a thin film. Also, nails are messy with Green Glue Compound. So we recommend screws for that reason as well.
Should I use conventional adhesive along with Green Glue Compound?
No. The presence of rigid, low-damping materials alongside Green Glue Compound between layers will reduce the performance of Green Glue Compound.
Using Green Glue Compound
Can Green Glue Compound be used in floors?
Yes. Green Glue Compound will increase STC and IIC performance, but only noticeably in assemblies with resilient ceilings. Green Glue Compound may be used between layers of subfloor or between subfloor and tile backer board. We would not recommend treating footfall noise by applying Green Glue Compound to the ceiling unless combined with a resilient sound clip or HushFrame system.
Can I treat just the ceiling, or should all surfaces be dealt with?
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.
Can Green Glue Compound be used in conjunction with decoupling techniques?
Yes. Green Glue Compound used in resilient walls or ceilings will increase STC and IIC ratings and reduce structural flanking. Green Glue Compound relies on resilience to work more efficiently, so staggered stud walls, or 24" on center framed walls, will allow the Green Glue Compound to perform better as well.
Will Green Glue Compound perform better between drywall and soundboard?
No. Soundboard is far lighter than drywall and isn’t preferable in any ceiling or wall assembly.
How does Green Glue Compound compare to other techniques?
When you compare the performance of damping to mass loaded vinyl, soundboard type products, resilient channel, joist tapes, and other products, the damping performance of Green Glue Compound generally win out in resilient structures. Mass loaded vinyl will outperform Green Glue Compound if the framing is 16" on center, if the wall includes plaster, or if the ceiling is not resilient. Isolating ceilings for airborne transfer and footfall noise, resilient sound clips, like the GenieClip® RST are a much better option.
How thick is a Green Glue Compound layer?
1/32″ or 0.5mm
How much do I need?
Standard tube application equates to 1 tube per 16 square foot or 1 pail per 365 square feet.
Refer to the Green Glue Compound product page for more information on estimating.
How much does Green Glue Compound cost?
It starts around .85 cents per square foot for pails and around $1.10 per square foot for quart sized tubes. Pricing depends on quantity and applicable discounts based on overall size of order.
Is Green Glue Compound a fire hazard?
No. Green Glue Compound is a UL rated product in several assemblies and can be utilized in fire-rated walls without diminishing the rating of the wall.
Is Green Glue Compound toxic?
No. Green Glue Compound is water based, non-toxic, non-carcinogenic, and very low in VOC (<5grams per liter / compliant in all 50 states and worldwide).